Efficient Java Sample Programming Techniques for Software Engineers

Struggling to learn Java programming? No need to worry; many have been in the same boat, looking for Java sample programming. Java stands as the second most popular programming language globally, thanks to its simplicity and security, attracting a vast developer community.

However, for beginners, grasping the basic concepts and syntax can be challenging. This blog aims to assist by offering a compilation of Java sample programs designed to aid in understanding fundamentals and enhancing coding skills. Readers are encouraged to dive into this resource to navigate the intricacies of Java programming.

Importance of learning Java

Learning Java is a smart step for your career. This programming language is simple to grasp. It boosts your skills fast. It helps you grow in your job as a developer. You can draw on this knowledge to make software.

More doors open when you have Java mastery. There are many jobs waiting for people who are good at Java!

Benefits of Java certification

Getting a Java certification is good for you. It shows that you have the skills to do programming jobs. With this certificate, you can show off your expertise in coding. This will make it easier for you to get a job and move up in your career.

Plus, it gives you respect in the industry and makes employers want to hire you more. When people see that you are always learning, they view that as being dedicated to your job. So yes, taking the time and effort to get a Java certification can really pay off!

Java Journeys: From Accidental Discovery to Mastery

Most of you might know that Java is a high-level programming language. Sun Microsystems, the guys who developed it, first named it Oak. The name changed later on to Java, as we know it today. It’s used in a lot of places! More than 95% of business desktops use Java.

Want to hear a fun fact? They found Java by accident. At first, they were making code for interactive TV. We bet they did not see that coming!

Now, let’s dive into some common examples in Java. You may have heard words like encapsulation and polymorphism before, but don’t worry if they sound big and hard right now! We will start from basics, such as control statements and object classes, which are simple enough for everyone.

Control is key in any programming language, including our hero, java here. Control statements help us direct how a program runs based on certain conditions or loops present in the code.

Another starter topic would be an object class, which just defines what type of data can be stored and what operations can be performed.

Learning these basic concepts step-by-step will help build your confidence towards more complex topics such as inheritance, polymorphism, abstraction, array handling, etc.

Next up on our list are several number programs like reversing numbers, converting numbers to words, etc., followed by an array full (pun intended!) of array programs ranging from copying arrays to sorting them!

We’ve got every nook and cranny covered, so you won’t miss out on anything important while learning this key player amongst enterprise desktops worldwide – JAVA!

Remember: Practice makes perfect!

So make sure you go through all these examples thoroughly because trust us when we say this: “Example isn’t another way to teach—it’s the only way!”

Popular Java Examples

Some popular examples of Java programming include control statements, object class, inheritance, polymorphism, abstraction, encapsulation, array, and other OOPs concepts.

Control Statements

We want to share some useful tips about Java control statements.

1. Control statements are the heart of Java.
2. They let you guide how your program works.
3. If, if – else, switch, break, and continue are all types of control statements.
4. These help decide what part of the code runs next.
5. Control statements make choices based on certain conditions.
6. They can change the way a program runs by moving it forward or breaking it up.
7. The flow of the program depends on control statements.
8. They are key parts of how a program is structured.
9. Control statements keep your code neat and tidy!

Object Class

Let’s talk about the Object class in Java. It is very important and useful. The Object class stays in the java.lang package. All other classes use this class as their base. Many common methods are in this class, like toString(), hashCode(), and equals(). These methods help us write good Java code.

1. Method Overriding: This lets you change what a method from a parent class does in a specific child class.
2. Method Overloading: This lets you make many versions of one method using different inputs.
3. Cloning: This makes a copy of an object.
4. Synchronisation: This makes sure two threads do not mess up shared data.
5. Typecasting: This changes an item from one type to another.
6. Equals: This checks if two objects are the same.

Inheritance

Learning Java can open new doors for you. One of the main parts of Java is Inheritance. It is a big idea in Object-Oriented Programming.

1. Inheritance lets one class take on the traits and actions of another class. This happens a lot in Java.
2. We use different types of Inheritance in Java, like single inheritance and multiple inheritance.
3. Using Inheritance makes writing code easier because it reuses parts that are already there.
4. Method overriding is part of this process, too; it specifies what the inherited method should do in the child class.
5. If you want to be good at making solutions with objects, you need to understand inheritance.
6. We call these ideas pillars because they hold up all the other parts of Object – Object-oriented programming.

Polymorphism

Polymorphism is a vital part of Java. It helps you write code that’s flexible and easy to use. Here are some key points:

1. Polymorphism lets an object take on many forms, and it makes your Java code more adaptable.
2. It allows an object to exhibit different behaviours depending on the context.
3. Polymorphism enables you to write code that is more adaptable and flexible to different situations.
4. There are two main types of polymorphism in Java – compile-time and runtime.
5. Compile-time polymorphism happens when your system compiles the code.
6. Runtime polymorphism takes place when you run the program.

Abstraction

Now, let’s talk about Abstraction in Java. It is a key part of object-oriented programming. Let’s look at why:

1. Abstraction shows only the needful attributes and hides any extra info.
2. This concept helps us group and sort objects. We do this based on how the objects act and their traits.
3. An abstract class does a big job in Java. It acts as a guide with data bits and methods for our program.
4. With abstraction, we can wrap up our code neatly, making it more modular.
5. This method makes your work as a coder much simpler and more streamlined.

Encapsulation

Encapsulation is an important concept in Java programming. It wraps data and associated methods into a single unit called a class. Here are some key points about encapsulation:

• It provides better data security and organisation.
• Encapsulation helps maintain code modularity and reusability.
• Encapsulating related data and methods within a class promotes clean and understandable code.
• It hides the internal implementation details of a class from the outside world.
• Encapsulation follows the principle of data hiding, ensuring that only necessary information is accessible to other parts of the program.

Array

Arrays are an important concept in Java programming. Here are some key facts about arrays:

1. Arrays in Java store a sequence of values that are all of the same type.
2. Arrays can be used to store data in a structured way, making it easier to access and manipulate.
3. Each element in an array is assigned an index, starting from 0 for the first element.
4. The length property of an array allows you to determine the number of elements it contains.
5. You can loop through all the elements in an array using a loop construct like “for” or “while”.
6. Arrays can be multidimensional; this can be imagined as an Excel table.

Miscellaneous OOPs Concepts

In Java programming, there are several miscellaneous OOPs concepts that are important to understand. These concepts help implement real-world scenarios and improve code organisation and maintainability. Some of these concepts include:

1. Inheritance: Inheritance allows a class to inherit properties and methods from another class. This promotes code reuse and helps create a hierarchy of classes.
2. Abstraction: Abstraction focuses on hiding the implementation details and exposing only the essential features of an object or class. It helps in reducing complexity and making the code more understandable.
3. Encapsulation: Encapsulation refers to bundling data and methods together within a class, preventing direct access to the data from outside the class. It ensures data security and enables better control over how the data is accessed and modified.
4. Polymorphism: Polymorphism allows objects of different classes to be treated as objects of a common superclass. It enables flexibility and extensibility in programming by allowing different implementations based on the context.

High-Level Programming with Java

Java is an important programming language to learn, especially if you want to work in the IT industry. It’s one of the most popular programming languages out there and is used in a wide range of applications, from enterprise software to desktop applications.

Java is known for its high-level programming capabilities and object-oriented approach, making it a powerful tool for software development. If you’re looking for a career as a developer or want to enhance your coding skills, learning Java and getting certified can open up great opportunities.

Practising Java programming with sample codes and examples can help you improve your skills and gain confidence in using this versatile language.

In addition to understanding the basics like control statements, object classes, inheritance, polymorphism, abstraction, encapsulation, and arrays; exploring number programs in Java can further expand your knowledge.

These programs cover different concepts like reversing numbers or converting them into words. You’ll also discover interesting number patterns like automorphic numbers or Keith numbers that add depth to your understanding of Java.

Furthermore, diving into array programs allows you to master manipulating arrays effectively. From copying elements between arrays or finding duplicates within an array to sorting elements or calculating sums – these exercises will provide practical experience with data structures commonly encountered in real-world scenarios.

Remember that practising Java programming regularly not only helps solidify concepts but also improves problem-solving skills necessary for success as a developer. There are various resources available online where you can find more sample codes and tutorials on different topics related to Java programming.

So whether you’re just starting out or looking to enhance your existing skills set by working on these examples – keep coding! The world of Java awaits you with endless possibilities for innovation and growth.

Java Number Programs

Mastering Java number programs lays a solid foundation for exploring more complex concepts. They’re not just about crunching numbers – they’re about understanding how logic can tame the numerical beast, revealing its hidden elegance and unleashing its computational power. Here’s a list of the best-known Java number programs:

• Reverse a number: This program takes a number from the user and reverses its digits.

• Convert number to word: This program converts a given number into words.

• Automorphic number: A program that checks whether a given number is an automorphic number or not.

• Peterson number: This program determines if a given number is a Peterson Number or not.

• Sunny number: A program that checks if a given number is a sunny (or square triangular) number or not.

Reverse a Number

Reversing a number in Java is an important concept for developers to learn. There are multiple ways to reverse a number in Java, such as using while loops, for loops, and recursion. Here are some key points to remember:

• Swapping the first and last digits of a number is the main technique used for reversing it.
• Loops can be used to reverse a number by repeatedly dividing it by 10 and adding the remainder to a new variable.
• Loops can also be used to reverse a number by iterating through each digit and building a new number in reverse order.
• Recursion is another approach where a function calls itself with the remaining digits of the number until it reaches the last digit.

• Using While Loop:

Code:
int input = 1234;
int reversed = 0;
while(input != 0) {
      int digit = input % 10;
      reversed = reversed * 10 + digit;
      input /= 10;
}
System.out.println(reversed);

Output:
4321

• Using for loop:

Code:
int input = 6789;
String inputString = String.valueOf(input);
String reversed = “”;
for(int i = (inputString.length – 1); i < 0; i–) {
       reversed += inputString.charAt(i);
}
System.out.println(reversed);

Output:
9876

• Using recursion:

Code:
public static void Reverse(int input) {
      if(input < 10) {
         System.out.println(input);
         return;
      }
      else {
         System.out.println(input % 10);
         Reverse(input / 10);
      }
}

Function calling:
Reverse(3579);

Output:
9753

Convert Number to Word

In this blog, we will share some Java programs that can convert numerical values into words. These programs are helpful for career seekers and developers who want to learn more about Java programming.

1. The article explains how to convert numerical values into words using the Java programming language.
2. A Sample Java program for converting digit numbers to words will be provided.
3. The article describes a way to do this with the help of an array which has the number words.

Code:

1. String[] oneToTwenty = {“one”, “two”, “three”, “four”, “five, “six”, “seven”, “eight”, “nine”, “ten”, “eleven”, “twelve”, “thirteen”, “fourteen”, “fifteen”, “sixteen”, “seventeen”, “eighteen”, “nineteen”, “twenty”};
2. System.out.println(“Please type a number between 1 and 20!”);
3. int input = Integer.valueOf(“17”);
4. System.out.println(oneToTwenty[input – 1]);

Output:

seventeen

Automorphic Number

Automorphic numbers are a special type of numbers in Java programming. They have a unique property – the square of an automorphic number ends with the same digits as the original number. For example, 25 is an automorphic number because its square, 625, ends with 25.

Peterson Number

A Peterson number is a special type of number related to Java programming. It can be identified by finding the factorial of each digit and adding them up. If the sum is equal to the original number, then it is a Peterson number. Recursive functions can be used in Java programming to determine if a number is a Peterson number or not. Peterson numbers are a subset of special numbers in mathematics and have applications in various fields.

Sunny Number

A Sunny number is a special number in Java programming.

1. Calculate the square root of the given number.
2. Add 1 to the square root.
3. Check if the result is a perfect square (a square of any whole number).

Tech Number

Tech number, also known as Technological Number, represents the position of a digit within a number system or the base of a number system. In Java Number Programs, Tech Numbers are used for various operations like addition, subtraction, multiplication, and division.

Understanding Tech Numbers is crucial in Java programming for performing mathematical calculations and manipulations on numbers. Java provides built-in methods and operators to work with Tech Numbers effectively. Working with Tech Numbers allows developers to handle and manipulate numerical data efficiently in their Java programs.

Fascinating Number

Fascinating numbers are interesting mathematical concepts that have a unique property. They are numbers with three or more digits. When a fascinating number is multiplied by 2 and 3, the resulting products are concatenated with the original number. This means that the resulting number contains all the digits from 1 to 9 exactly once.

Fascinating numbers can be implemented in Java programming to check whether a number is fascinating or not. They can also be used to demonstrate certain mathematical concepts and algorithms. There are different ways to write a program in Java to check the fascinating property of a number.

Keith Number

A Keith number is a special type of number with a unique property.

• Its digits combine in a specific way to generate a new sequence.
• These numbers are rare and have similarities to Fibonacci numbers.
• To determine if a number is a Keith number, you can use Java programming.
• A Keith number is defined as the sum of the factorials of its digits.
• They are named after the mathematician James Keith, who discovered them.
• Java programs can help you check for Keith numbers and explore their properties.

Neon Number

Defined as a positive integer whose sum of squared digits equals the original number itself, a Neon Number possesses a hidden elegance that enthrals programmers.

Imagine the intrigue of crafting code that unravels this secret, where the sum of individual digits in the square precisely mirrors the original form. This property elevates Neon Numbers beyond mere integers, transforming them into intriguing objects for programmers to dissect and comprehend.

Spy Number

A spy number is a special type of positive integer in Java programming.

• It has a unique property where the sum of its digits is equal to the product of its digits.
• To determine if a number is a spy number in Java, we compare the sum and product of its digits for equality.
• Java programs can be written to find all the spy numbers within a given range of numbers.
• Spy numbers can be used for mathematical calculations and problem-solving related to number manipulation in Java programming.
• Aspiring developers and career seekers can utilise spy numbers to practice coding and enhance their skills in number-related programming tasks.

Java Array Programs

Welcome to the world of Java array programming, where the power and versatility of arrays come to life. In this exploration, we delve into the fundamental and advanced techniques of manipulating arrays in Java, offering a comprehensive guide for both beginners and seasoned developers.

From basic array operations to intricate programming challenges, these Java array programs serve as a gateway to mastering the art of array handling in one of the most widely used programming languages. Join us on this journey as we unlock the potential of arrays in Java through practical and insightful programming examples.

Copying Elements from One Array to Another

Copying elements from one array to another in Java is a common task that developers often need to perform. There are several methods available to achieve this, depending on the specific requirements of the program. Here are some approaches you can consider:

1. Using the copyOfRange() method: This method is provided by the Arrays class in Java and allows you to copy a range of elements from one array to another. It takes the original array, starting index, and ending index as parameters and returns a new array containing the copied elements.
2. Iterating through the original array: Another approach is to use a loop to iterate through each element of the original array and copy them one by one to the new array. You can use a for loop or a while loop for this purpose.
3. Choosing the appropriate method: When copying arrays in Java, it is important to choose the right method based on your specific needs. Consider factors such as performance, memory usage, and whether a deep or shallow copy is required.

Finding the Frequency of Each Element in an Array

When working with arrays in Java, it is important to be able to find the frequency of each element. Here are some ways you can do this:

1. Two-Loop Approach: One way to find the frequency of each element is by using two loops. The outer loop will iterate through each element in the array, and the inner loop will count how many times that element appears in the rest of the array.
2. Limited Range Assumption: Another approach is to assume a limited range for the values in the array. If you know that the elements in the array fall within a specific range, you can create a new array to store the frequencies and increment the corresponding index whenever you encounter that value.
3. Traversing and Counting: To find the frequency of elements in an array, you can traverse through it and count how many times each element occurs. This involves comparing each element to all other elements in the array.
4. Sorted Array Comparison: If your array is sorted, you can determine the frequency of each element by checking if the current element is equal to the next one. If they are equal, increase a counter variable; otherwise, reset it.

Left Rotating Elements of an Array

Left rotation is a process of shifting each element of the array towards the left by a specified number of positions. This program focuses on manipulating arrays in Java programming language. You can use this logic to write your own Java program for left-rotating an array by a given number. Let’s take a look at how to left-rotate elements of an array in Java:

1. Declare and initialise an array with some elements.
2. Specify the number of positions by which you want to rotate the array towards the left.
3. Create a temporary variable to store the first element of the array.
4. Shift all elements one position to the left, starting from index 1 up to the last element.
5. Assign the value stored in the temporary variable to the last position in the array.
6. Repeat steps 3 to 5 for as many rotations as desired.

Printing Duplicate Elements of an Array

Here’s a program that can help you print the duplicate elements of an array in Java. This program is useful for handling duplicate values in an array. Here’s how it works:

1. First, we use two loops in the program.
2. The first loop selects an element from the array.
3. Then, the second loop compares the selected element with the remaining elements in the array.
4. If a duplicate value is found, it is printed as output.

Printing Elements of an Array

Printing elements of an array in Java is a common task in programming. Here are some techniques you can use:

1. Use a for loop to iterate through the array and print each element:

• Declare a variable to store the length of the array.
• Use a for loop with an index variable starting from 0 and ending at the length of the array minus 1.
• Access each element using the index variable and print it.

int[] array = {12, 23, 45, 13, 15}

2. Use an enhanced for loop (also known as a for-each loop) to iterate through the array and print each element:

• Declare the enhanced for loop with a variable to represent each element in the array.
• The variable automatically takes on each value from the array, one by one.
• Print the value of the variable inside the loop.

3. se Arrays.toString() method to convert the whole array into a string and then print it:

• Import java.util.Arrays if not done already.
• Pass your array as an argument to Arrays.toString() method.
• Assign this result to a string variable and then print it.

Printing Elements of an Array in Reverse Order

In Java programming, it is possible to print the elements of an array in reverse order. This can be done using different approaches, such as using a temporary array or swapping elements. Here are the steps to achieve this:

1. Iterate through the array starting from the last element.
2. Print each element one by one until you reach the first element.
3. Continue printing the elements in reverse order until you have printed all the elements.

Printing Elements of an Array Present on Even/Odd Positions

In this Java programming example, we will show you how to print the elements of an array that are present in odd positions. Here’s how you can do it:

• Access the array elements: Use array indexing to access and retrieve specific elements from the array.

• Loop through the array: Iterate over each element of the array using a loop.

• Check for odd positions:
  • Determine if the index of each element is odd or even.
  • Remember, odd positions have even indexes.

• Selectively print elements:
  • Use conditional statements to selectively print the elements based on their positions in the array.
  • If the index is odd, print the corresponding element.

Finding the Largest/Smallest Element in an Array

In this blog post, we want to talk about how to find the largest and smallest elements in an array using Java programming. It is an important concept that can be useful for career seekers and developers. Here are some key points to remember:

• Use a Java program to find the largest and smallest numbers in an array.
• Create a class called FindLargestSmallestNumber in Java to perform this task.
• The program should take an input array as a parameter.
• Use a loop to iterate through the elements of the array.
• Keep track of the current largest and smallest numbers as you go through the array.
• Compare each element with the current largest and smallest numbers.
• If an element is larger than the current largest number, update the largest number.
• If an element is smaller than the current smallest number, update the smallest number.

Finding the Number of Elements in an Array

The length of an array in Java is determined by the number of elements it can hold. In Java, arrays have a fixed size and do not have a concept of “the amount of the array currently in use.” To find the number of elements in an array, you can use the “length” property of the array.

The length property can be accessed using the dot operator followed by “length” (e.g., arrayName.length). By iterating through each element of the array and incrementing a counter variable, you can count the elements. The length property is commonly used to determine the size of an array in Java programming.

Finding the Sum of All Items in an Array

In Java, you can find the sum of all items in an array by iterating through the array and adding each element to a running total. Alternatively, starting from Java 8, you can use the Stream API to achieve the same result more concisely.

Both approaches will give you the sum of all elements in the array. Choose the one that fits your coding style or the version of Java you are working with.

Right-Rotating Elements of an Array

When we want to right-rotate the elements of an array in Java, we can use a specific method. Here are the steps to perform this operation:

1. Loop through the array from the last element to the first.
2. For each element, move it to the right by one position.
3. Repeat this process for all elements in the array.
4. The last element will be moved to the first position.

Sorting Elements of an Array in Ascending/Descending Order

Sorting elements of an array in ascending/descending order is an important skill to have in Java programming. Here are some key points to remember:

1. Use the Arrays.sort() method: One way to sort an array is by using the Arrays.sort() method provided by Java. This method sorts the elements of the array in ascending order.
2. Sorting in descending order: To sort the array in descending order, you can use the reverseOrder() method from the Collections interface. Pass this as a parameter to the Arrays.sort() method.
3. Reversing the array: Another way to achieve descending order is by first sorting the array in ascending order using Arrays.sort(), and then reversing the sorted array using appropriate methods.
4. Sort primitive arrays: If you’re working with a primitive array (such as int[], char[], etc.), you need to sort it in ascending order first and then reverse it to get descending order.
5. Additional sorting algorithms: Apart from using built-in methods, you can also implement your own sorting algorithms like bubble sort, selection sort, or merge sort for sorting arrays.
6. Consider other types of ordering: Besides numerical ordering, you can also sort arrays based on alphabetical order or any custom ordering criteria that suit your program’s requirements.

Finding the 3rd Largest/2nd Largest/Largest/2nd Smallest/Smallest Number in an Array

Finding the third largest, second largest, largest, second smallest, and smallest numbers in an array can be done using different approaches.

1. To find the third largest number in an array, you can sort the array in ascending order and return the element at index length-3.
2. To find the second largest and smallest numbers in an array, you need to input the size of the array and then enter all the elements. After that, you can sort the array and return the element at index length-2 for the second largest number and index 1 for the second smallest number.
3. If you want to find the two largest numbers in an array, you can simply sort the array in descending order and return the first two elements.
4. The naive approach for finding the third largest number in an array of distinct elements is by first finding the largest element, then finding the second-largest element (excluding this from consideration), and finally excluding both these elements to find the third-largest element.
5. If you want to rearrange an array in a specific order where the smallest number comes first, followed by the largest number, and then by the second smallest number, a specific algorithm must be implemented based on sorting or other techniques.
6. To find the second largest number in an array, you should sort it in descending order and return the element at index 1.

Removing Duplicate Elements in an Array

An array is a collection of items stored together in computer memory. Sometimes, arrays may contain duplicate elements. Removing these duplicates can be important for various reasons, such as improving efficiency or ensuring data integrity.

One way to remove duplicate elements from an array is by sorting the array first. Java provides the Arrays.sort(arr) function to sort arrays quickly and easily. After sorting the array, you can iterate through it and remove any consecutive duplicate elements.

Another approach to removing duplicates is by using the Set data structure. Sets do not allow duplicate elements, so adding all the elements from an array to a Set will automatically remove any duplicates.

Finally, you can also use other techniques or algorithms to identify and remove duplicate elements from an array.

In conclusion, learning Java programming and practising with various sample programs is crucial to becoming proficient in this versatile language. By exploring different concepts and solving programming exercises, you can enhance your skills and gain confidence as a developer.

Remember to continue seeking additional resources and opportunities for growth in the exciting world of Java programming. Happy coding!