Question

我知道这可能是一个非常简单的问题，但由于我只使用JPanel和JFrame一个周末，所以请不要太过于依赖我。我的问题是我有这个代码：

package Game_Elements;
import java.awt.Color;
import java.awt.Desktop.Action;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.RenderingHints.Key;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.AbstractAction;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Game implements KeyListener
{
private JFrame frame = null;
private JPanel panel = null;
int y = 0;
int x = 0;
public boolean W_TRUE;
public boolean S_TRUE;
public boolean A_TRUE;
public boolean D_TRUE;
public void keyPressed(KeyEvent e)
{

    if(e.getKeyCode()== KeyEvent.VK_W){
            y-= 15;
            panel.setLocation(x, y);
            W_TRUE = true;

    }
    if(e.getKeyCode()== KeyEvent.VK_S){
            y+= 15;
            panel.setLocation(x, y);
            S_TRUE = true;
    }
    if(e.getKeyCode()== KeyEvent.VK_A){
            x-= 15;
            panel.setLocation(x, y);
            A_TRUE = true;
    }
    if(e.getKeyCode()== KeyEvent.VK_D){
            x+= 15;
            panel.setLocation(x, y);
            D_TRUE = true;
    }
    if(D_TRUE == true  && S_TRUE == true ){
        y+= 15;
        x+= 15;
        panel.setLocation(x, y);
    }
    if(A_TRUE == true  && W_TRUE == true ){
        y-= 15;
        x-= 15;
        panel.setLocation(x, y);
    }
    if(A_TRUE == true  && S_TRUE == true ){
        y+= 15;
        x-= 15;
        panel.setLocation(x, y);
    }
    if(D_TRUE == true && W_TRUE == true ){
        y-= 15;
        x+= 15;
        panel.setLocation(x, y);
    }
}
public void keyReleased(KeyEvent e)
{
    if(e.getKeyCode()== KeyEvent.VK_W){
        W_TRUE = false;
}
if(e.getKeyCode()== KeyEvent.VK_S){
        S_TRUE = false;
}
if(e.getKeyCode()== KeyEvent.VK_A){
        A_TRUE = false;
}
if(e.getKeyCode()== KeyEvent.VK_D){
        D_TRUE = false;
}
if(e.getKeyCode()== KeyEvent.VK_SPACE){
    System.out.println("Running JUMP");
    for(int j = y - 200; j < y; y-= 15){
        try {
            Thread.sleep(10);
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        panel.setLocation(x, y);
        panel.revalidate();
    }   
    System.out.println("Complete");

}
}

public void keyTyped(KeyEvent e) {

}

public void frameStart()
{

    frame = new JFrame();
    frame.setVisible(true);
    frame.setTitle("Desperation");
    frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS)); // otherwise nice exceptions java.awt.AWTError:
    frame.setPreferredSize(new Dimension(1920, 1050));
    frame.setSize(new Dimension(1920, 1050));
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    System.out.println("Frame Created");

    panel = new JPanel();
    panel.setBackground(Color.BLUE);
    panel.setMaximumSize(new Dimension(200, 200));
    panel.setLocation(1080, 500);
    panel.revalidate();
    frame.add(panel);
    System.out.println("Panel Created");

    frame.addKeyListener(this);
    System.out.println("Listener Created");
}

public static void main(String[] args){

    Game obj = new Game();

    obj.frameStart();
}

}

我所拥有的面板，一个基本的200x200蓝色立方体，在循环完成运行之前似乎没有改变位置，所以它更像是一个跳跃而不是任何东西。我知道重绘功能只能尽快运行，因为这可能是问题所在，我想知道你们中的任何一个人是否有一个关于刷新它的替代方法的建议，所以它不一定看起来很顺利，但是至少表现出一些进展。任何建议都表示赞赏，因为我对JPanel，JFrame或JAnything都不太了解。谢谢！

Answer 1

用于刷新

this.revalidate();

是“刷新”JComponent的好方法

在完成循环完成之前，JPanel不会更新或重新绘制

1 个答案: