Maximum Long Value Not Being Accepted

I am trying to run some JUnit Tests on a Pinball game. The game uses a long for scores and ints for the number of balls. I want to do some boundary value analysis, so I am trying to first test the exact boundary of int and long, and then test that boundary + 1. In my code, when I set the value of max_long, I get an error saying it is out of bounds for an int, however it is cast as a long. My question is "How do I get the program to see the value of max_long as a long type rather than type int.

package com.dozingcatsoftware.bouncy;

import junit.framework.TestCase;

public class BoundaryValues extends TestCase {

Field field = new Field();
int max_int = 2147483647;
long max_long = 9223372036854775807;
public BoundaryValues(String name) {
    super(name);
}

public void testGetTotalBalls() {
    //test number of balls with impractically high number
    field.getGameState().setTotalBalls(max_int);
    int numballs = field.getGameState().getTotalBalls();
    assertTrue("Number balls still ok.", numballs > 1);
}

public void testGetTotalBallsTooHigh() {
    /*what we will do here is pass the setTotalBalls function a value just outside 
    the possible integer value. This should cause the program to crash, because the number
    of balls has to be an integer. Allow this example is in a way impractical it is still theoretically
    possible that someone could somehow get this many balls in pinball, so the program should still be tested. 
    */
    field.getGameState().setTotalBalls((max_int + 1));
    long numballs = field.getGameState().getTotalBalls();
    assertTrue("Number of Balls Too High", numballs == (int)numballs);
}

public void testSetTotalBalls() {
    /*can number of balls be set to negative. We should not be able to set the number of balls in pinball
     *to negative. this will test whether it is ok or not. if it is not okay a change should be maid so it
     *checks for negative values.
     */
    field.getGameState().setTotalBalls(-1);
    int numballs = field.getGameState().getTotalBalls();
    assertTrue("Number Balls Negative", numballs < 0);
}

public void testSetScoreOk() {
    field.getGameState().setScore(max_long);
    long score = field.getGameState().getScore();
    assertTrue("Score should be okay for long", score > 100000000);
}

public void testSetScoreTooHigh() {
    field.getGameState().setScore((max_long + 1));
    long score = field.getGameState().getScore();
    assertTrue("Score should be okay for long", score > 100000000);
}

}