java - 非静态方法

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                                7年前关闭。
            
                    
我这里有一个课程，旨在在按下键时在窗口中移动枪支。但是，从类型引用非静态方法时出现错误。这是两个部分。错误出现在两行“ if（k == .....”）处。

private class Keyboard extends KeyAdapter {

    public void keyPressed (KeyEvent e) {

        int k = e.getKeyCode();

        if (k == 39) {Gun.move(10);}
        if (k == 37) {Gun.move(-10);}

    }

}

public class Gun {

        private Color color;
        private int A,B,C,D;
        private int E,F,G,H;

        public Gun (Color c) {

            color = c;
            A = 375;
            B = 550;
            C = 50;
            D = 10;
            E = 395;
            F = 540;
            G = 10;
            H = 10;

        }

        public void move(int xAmount){

            A = A + xAmount;
            E = E + xAmount;

        }

    }

最佳答案

哪个Gun？您需要一个实例，即对由此创建的Gun对象的引用：

Gun gun = new Gun(...);
gun.move(amount);

您的Keyboard对象将必须以某种方式引用此Gun对象，或者可能是某个知道您要移动Gun的管理器类型的对象。