Nested if and Multi-Way if-else Statements

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Nested if and Multi-Way if-else Statements:           An if statement can be nested inside another if statement, forming a nested if statement. This allows for more complex decision-making in a program.           In a nested if statement, an if statement is placed inside another if statement. The inner if statement is considered to be nested within the outer if statement. There is no limit to the depth of nesting and an inner if statement can also contain another if statement.           Here is an example of a nested if statement: if (i > k) {     if (j > k)         System.out.println("i and j are greater than k"); } else {     System.out.println("i is less than or equal to k"); }           In this example, the inner if statement ` if (j > k) ` is nested inside the outer if statement ` if (i > k) `. This allows for different actions to be taken based on multiple conditions.           A nested if statement can be used to implement multiple alternatives. F
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Creating, compiling and Executing a simple java program

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Creating, compiling and Executing a simple java program:


            Java is a widely used programming language known for its simplicity and platform independence. In this guide, I will walk you through the process of creating, compiling, and executing a simple Java program.

Step 1: Set up Java Development Kit (JDK) Before you start writing Java programs, make sure you have the Java Development Kit (JDK) installed on your computer. You can download the latest version of JDK from the official Oracle website and follow the installation instructions for your operating system.

Step 2: Choose a Text Editor or Integrated Development Environment (IDE) Next, you need to choose a text editor or an Integrated Development Environment (IDE) to write your Java code. Some popular choices for text editors include Notepad++, Sublime Text, or Visual Studio Code. Alternatively, you can use an IDE such as Eclipse, IntelliJ IDEA, or NetBeans, which provide a more comprehensive development environment with features like code completion, debugging, and project management.

Step 3: Create a New Java File Open your chosen text editor or IDE and create a new file with a ".java" extension. This file will contain your Java code. For this example, let's create a file named "HelloWorld.java."


Step 4: Write the Java Code Inside the newly created file, you can start writing your Java code. Let's write a simple program that prints "Hello, World!" to the console:
  1. public class HelloWorld {
  2.     public static void main(String[] args) {
  3.         System.out.println("Hello, World!");
  4.     }
  5. }
            This program consists of a single class named "HelloWorld" with a single method called "main." The "main" method is the entry point of the program and is where the execution starts. In this example, it uses the System.out.println() method to print the text "Hello, World!" to the console.

Step 5: Save the File Once you have written the code, save the file with the ".java" extension. Make sure to choose a location on your computer where you can easily locate the file.

Step 6: Compile the Java Program To compile your Java program, open a command prompt or terminal window and navigate to the directory where you saved the ".java" file. Use the "javac" command followed by the name of your file to compile it. In this case, you would run the following command:


javac HelloWorld.java

            If there are no errors in your code, the Java compiler will generate a file named "HelloWorld.class." This file contains the compiled bytecode that the Java Virtual Machine (JVM) can execute.

Step 7: Execute the Java Program To execute your compiled Java program, use the "java" command followed by the name of your class (without the ".class" extension). In this case, you would run the following command:


java HelloWorld

            If everything went well, you should see the output "Hello, World!" printed to the console.

            Congratulations! You have successfully created, compiled, and executed a simple Java program. This basic process applies to more complex Java programs as well, where you can create multiple classes and interact with various libraries and frameworks. Remember to save your files with the ".java" extension, compile them with the "javac" command, and execute them with the "java" command.

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