syntax of java and how java code runs

how java code runs:

When a Java program is compiled, it is transformed into bytecode, which is a platform-independent format. The bytecode can then be executed on any platform that has a Java Virtual Machine (JVM) installed.

The JVM is responsible for executing the bytecode. When a Java program is run, the JVM loads the bytecode into memory and executes it. The JVM includes a just-in-time (JIT) compiler, which compiles parts of the bytecode into machine code as they are executed. This improves the performance of the program.

The JVM also provides a runtime environment for the program, which includes features such as memory management and garbage collection. The Java program runs within this environment, and the JVM ensures that the program operates within its constraints.

Overall, Java code executes by first being compiled into bytecode, which is then executed by the JVM. The JVM provides a runtime environment for the program, and includes features such as memory management and garbage collection to ensure that the program operates smoothly.

syntax of java:

Example 1: Printing a Message to the Console

public class Hello { 
public static void main(String[] args) 
{
System.out.println("Hello, world!"); 
 } 
}

Explanation:

• public class Hello - This declares a public class named Hello.
• public static void main(String[] args) - This is the entry point for the program and is required in all Java programs. It declares a public static method named main that takes a string array as an argument.
• System.out.println("Hello, world!"); - This statement prints the text "Hello, world!" to the console.

Example 2: Adding Two Numbers

public class Add {
    public static void main(String[] args) {
        int num1 = 5, num2 = 7, sum;
        sum = num1 + num2;
        System.out.println("The sum of " + num1 + " and " + num2 + " is " + sum);
    }
}

Explanation:

• public class Add - This declares a public class named Add.
• public static void main(String[] args) - This is the entry point for the program and is required in all Java programs. It declares a public static method named main that takes a string array as an argument.
• int num1 = 5, num2 = 7, sum; - This declares and initializes three integer variables, num1, num2, and sum.
• sum = num1 + num2; - This statement adds the values of num1 and num2 and assigns the result to sum.
• System.out.println("The sum of " + num1 + " and " + num2 + " is " + sum); - This statement prints the message "The sum of" followed by the values of num1 and num2, the text "and", and the value of sum to the console.