重新绘制不更新？

Question

截至目前，我正在努力创建一个JAVA版本的uno，我的老师称之为“单打”。目前，我只是试图找到一个可以移除卡片的工作套牌。

虽然我现在的问题是，当我删除一张卡时，没有任何更新。它根本不重绘。我不知道为什么。

这是面板和框架类。

面板：

package singles; 

import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import javax.swing.JPanel; 
import java.awt.event.MouseMotionListener; 
/** 
* 
* @author Xenorosth 
*/ 

public class CardPanel extends JPanel{ 
    private Card myCard; //To get information for card 
    //private static Deck myDeck = new Deck(); //Get a deck! 
    public CardPanel(Card myOtherCard){ 
     this.setSize(100,150); 
     this.setPreferredSize(new Dimension(100,150)); 
     myCard = myOtherCard; 
     //myCard = myDeck.getMainCard(0); 
    } 

    public void paintComponent(Graphics g){ 
     super.paintComponent(g); 
     g.setColor(Color.black); //Set word drawings to black 

     if(myCard.isFlipped()){ 
      if(myCard.getColor() == "red"){ 
       this.setBackground(Color.red); 
       g.drawString(myCard.getValue(), 30, 30); 
      } 
      else if(myCard.getColor() == "green"){ 
       this.setBackground(Color.green); 
       g.drawString(myCard.getValue(), 30, 30); 
      } 
      else if(myCard.getColor() == "blue"){ 
       this.setBackground(Color.blue); 
       g.drawString(myCard.getValue(), 30, 30); 
      } 
      else if(myCard.getColor() == "yellow"){ 
       this.setBackground(Color.yellow); 
       g.drawString(myCard.getValue(), 30, 30); 
      } 
      else if(myCard.getColor() == "black"){ 
      this.setBackground(Color.black); 
      g.setColor(Color.white); 
      g.drawString(myCard.getValue(), 30, 30); 
      g.setColor(Color.black);  
      } 
     } 
     else{ 
     this.setBackground(Color.black); 
     g.setColor(Color.white); 
     g.drawString("Singles", 30, 30); 
     g.setColor(Color.black); 

     } 


    } 

    /** 
    * @return the myCard 
    */ 
    public Card getMyCard() { 
     return myCard; 
    } 

    /** 
    * @param myCard the myCard to set 
    */ 
    public void setMyC`enter code here`ard(Card myCard) { 
     this.myCard = myCard; 
    } 

} 

框架：

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package singles; 

import java.awt.Component; 
import java.awt.Dimension; 
import java.awt.FlowLayout; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 


/** 
* 
* @author Xenorosth 
*/ 
public class SinglesFrame extends JFrame implements MouseListener, MouseMotionListener{ 

    Deck myDeck = new Deck(); 
    CardPanel myTopMain = new CardPanel(myDeck.getMainCard(0)); //Top card of main deck 
    CardPanel myTopUsed = new CardPanel(myDeck.getMainCard(1)); //Top card of used deck 
    JLabel myLabel1 = new JLabel(); 


    public SinglesFrame(){ 
     setLayout(new FlowLayout(FlowLayout.CENTER)); 
     // myLabel1.setText(myDeck.getMainDeckLength() + ""); 
     myTopMain.addMouseListener(this); 
     this.add(myTopMain); 
     this.add(myTopUsed); 
     this.add(myLabel1); 

    } 

    @Override 
    public void mouseClicked(MouseEvent e) { 
      myDeck.addUsedCard(myDeck.getMainCard(0)); 
      myDeck.removeMainCard(0); 
      this.repaint(); 
      System.out.println(myDeck.getMainCard(0).toString()); 
    } 

    @Override 
    public void mousePressed(MouseEvent e) { 
     //throw new UnsupportedOperationException("Not supported yet."); 
    } 

    @Override 
    public void mouseReleased(MouseEvent e) { 
     // throw new UnsupportedOperationException("Not supported yet."); 
    } 

    @Override 
    public void mouseEntered(MouseEvent e) { 
    // throw new UnsupportedOperationException("Not supported yet."); 
    } 

    @Override 
    public void mouseExited(MouseEvent e) { 
     // throw new UnsupportedOperationException("Not supported yet."); 
    } 

    @Override 
    public void mouseDragged(MouseEvent e) { 
     // throw new UnsupportedOperationException("Not supported yet."); 
    } 

    @Override 
    public void mouseMoved(MouseEvent e) { 
     // throw new UnsupportedOperationException("Not supported yet."); 
    } 

} 

Answer 1

让我们从这里开始......

CardPanel myTopMain = new CardPanel(myDeck.getMainCard(0)); 
CardPanel myTopUsed = new CardPanel(myDeck.getMainCard(1)); 

您创建的CardPanel两个实例。每个面板被传递给Card

参考然后在mouseClicked你时，你这样做......

myDeck.addUsedCard(myDeck.getMainCard(0)); 
myDeck.removeMainCard(0); 
this.repaint(); 
System.out.println(myDeck.getMainCard(0).toString()); 

你已经改变了Deck，而是参考Card两个CardPanel s为指向没有改变。

您需要拨打（类似）setMyCard并传递下一张显示卡或null。

你可能有接下来的问题是，你的paintComponent方法不允许的nullCard