LWJGL - inflictDamage（）java.lang.nullPointerException

Question

我最近一直在LWJGL工作，我遇到了一个问题。我创建了一个inflictDamage（）方法，但是当我激活它时它返回一个Null Pointer Exception。这是我的代码： inflictDamage（）方法：

public static void inflictDamage(int type, GameObject attacker, GameObject enemy, boolean facingLeft, float damageIncrement, float ehp, float attackerCenter, float enemyCenter){
    float attackX = attackerCenter - 16;
    if(type == 1){
        if(facingLeft == true){
            attackX = attackerCenter - 16;
            if(attackX == enemyCenter){
                ehp -= damageIncrement;
            }
        }
        else if(facingLeft == false){
            attackX = attackerCenter + 16;
            if(attackX == enemyCenter){
                ehp -= damageIncrement;
            }
        }
    }
}

激活的地方：

package geniushour.game;

import org.lwjgl.input.Keyboard;

public class GOMainCharacter extends GameObject{

public static final int SIZE = 50;
public static final float MaxSpeedX = 4f;
public static final float MaxSpeedY = 8f;

public float velX;
public float velY;

public final float baseOffsetX;
public final float baseOffsetY;

public static float telepointX;
public static float telepointY;

public int cType = 1;

public static boolean faceLeft = true;

public static GOMainCharacter p;
public static GOMonster m;

public GOMainCharacter(float offsetX, float offsetY){

    this.offsetX = offsetX;
    this.offsetY = offsetY;
    this.yPos = SIZE;
    this.xPos = SIZE;
    this.baseOffsetX = this.offsetX;
    this.baseOffsetY = this.offsetY;

    velX = -MaxSpeedX;
    velY = -MaxSpeedY;
}

@Override
void update() {

    if(Keyboard.isKeyDown(Keyboard.KEY_A)){
        telepointX = offsetX;
        telepointY = baseOffsetY;
        faceLeft = true;
        offsetX += velX;
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_D)){
        telepointX = offsetX;
        telepointY = baseOffsetY;
        faceLeft = false;
        offsetX += -velX;
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_S)){
        Draw.inflictDamage(cType, p, m, faceLeft, 10, m.healthPoints, p.getCenterY(), m.getCenterY());
    }

}
    }

我还可以提供GameObject类，如果需要的话。