Following program will add two Integer numbers for you.

// file Addition.java
import java.io.*;
class Addition{
	public static void main(String args[]) throws IOException{
		int a,b;
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Enter first integer");
		a=Integer.parseInt(br.readLine());
		System.out.println("Enter second integer");
		b=Integer.parseInt(br.readLine());

		System.out.println("Sum of two integers is: "+(a+b));
	}
}

To run the above code navigate to the source code folder from cmd(Windows) or terminal(Linux) then type the following code to compile javac <filename>.java after sucessfully compiling, type java Addition to start the programe.

The above programme will output the following result

Enter first integer
12
Enter second integer
123
Sum of two integers is: 135
```