When running or debugging code inside NetBeans, the output window displays the text printed by System.out.print, or 
System.out.format, or System.out.printf calls only when the code ends execution. Calls to System.out.flush don't help 
either. If I use println calls or add \n in the previously listed methods, the code executes properly.

The sample code:

import java.util.Scanner;

public class Test {
    public static void main( String args[] ) {
        Scanner input = new Scanner( System.in );
        
        System.out.print( "Enter first integer: "); 
        //System.out.flush();
       int x = input.nextInt(); 
        
        System.out.print( "Enter second integer: " ); 
        // System.out.flush();
        int y = input.nextInt(); 
        
               
        System.out.printf( "Sum is %d\n", x + y );
        
    } 
    
}