This is very simple, just define two integer variables and use + operator to add them.

package JavaQuestions;

/**
 * 
 * @author NaveenKhunteta
 *
 */
public class AddNumbers {

	public static void main(String[] args) {

		int a = 10;
		int b = 20;

		int sum = a + b;

		System.out.println("sum of a and b is: " + sum);

	}

}

Output:

sum of a and b is: 30

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