Example: Program to Add Two Integers
class Main {
  public static void main(String[] args) {
    
    int first = 10;
    int second = 20;
    // add two numbers
    int sum = first + second;
    System.out.println(first + " + " + second + " = "  + sum);
  }
}
Output:
10 + 20 = 30
In this program, two integers 10 and 20 are stored in integer variables first and second respectively.
Then, first and second are added using the + operator, and its result is stored in another variable sum.
Finally, sum is printed on the screen using println() function.
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