what is a java program code example

Example 1: basic java coding

public class AddTwoNumbers {

   public static void main(String[] args) {
        
      int num1 = 5, num2 = 15, sum;
      sum = num1 + num2;

      System.out.println("Sum of these numbers: "+sum);
   }
}

Example 2: what is java

Java is a general-purpose programming language that is 
class-based, object-oriented, and designed to have as 
few implementation dependencies as possible.

Hello World in Java:
public class FileName {
  public static void main(String args[]) {
    System.out.println("Hello World!");
  }
}