Simple Java program

class First
{
public static void main(String[] args)
{
System.out.println(“Hello java”);
}
}

Class name – First (First letter must be a Capital)

public static void main(String[] args) – Main method of a program

System.out.println(“Hello java”); – Output Statement

Output:-

Hello java

Java Program to Add two Numbers

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);
   }
}

Output:

Sum of these numbers: 20

Reference:- 

Java Program to Add two Numbers