は私が出力した画像と同じ結果をこのコードをやろうとしている4つのサークルボタン一つさまざまなサイズと色

Question

を描く私はボタンをクリックしたとき、それはその後、1つの黒丸で始まる必要があり

、白丸が表示されますシフトと右と20個のピクセルで大きな得るので、ここでのコード

だ に第四円の後に、それは、ウィンドウをクリアする必要がありますし、最初から始めると私は一緒に

を一つだけ、円の色や二つの円を得続けます

import java.awt.*; 
import java.awt.event.*; 
import java.util.ArrayList; 
import java.util.List; 
import javax.swing.*; 
import javax.swing.WindowConstants; 

public class CircleList extends JFrame implements ActionListener { 
    JButton addCircle; 
    int nCircle = 1; 
    int step = 0; 
    int shift = 0; 
    int d = 0; 

    public static void main (String [] args){ 
     new CircleList(); 
    } 

    private class Circle { 
     public int x1; 
     public int y1; 
     public int w; 
     public int h; 
     public Color color; 
    } 

    private List<Circle> whiteList = new ArrayList<>(); 
    private List<Circle> blackList = new ArrayList<>(); 


    public CircleList() { 
     super("CircleList"); 
     setSize(500,500); 
     setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);   
     getContentPane().setBackground(Color.gray); 
     addCircle = new JButton("Add Circle"); 
     add(addCircle,BorderLayout.SOUTH); 
     addCircle.addActionListener(this); 
     repaint(); 

     setVisible(true); 
    } 

    public void paint(Graphics g){ 
     super.paint(g); 
     g.fillOval(35, 35, 35, 35); 
     if (d==1) { 
      for (Circle s: whiteList) { 
       paintWhiteCircle(g, s); 
      } 
      addWhiteCircle(); 
     } 
     else if (d==2) { 
      for (Circle s: blackList) { 
       paintBlackCircle(g, s); 

      } 
      addBlackCircle(); 
     } 
    } 

    public void paintWhiteCircle(Graphics g, Circle circle) { 
     g.setColor(circle.color); 
     g.fillOval(circle.x1, circle.y1, circle.w, circle.h); 
    } 

    public void paintBlackCircle(Graphics g, Circle circle) { 
     g.setColor(circle.color); 
     g.fillOval(circle.x1, circle.y1, circle.w, circle.h); 
    } 

    public void addBlackCircle(){ 

     Circle circle = new Circle(); 

     circle.x1 = 40 + shift; 
     circle.y1 = 30 ; 
     circle.w = 30 + step; 
     circle.h = 30 + step; 
     circle.color = new Color(0,0,0); 
     this.blackList.add(circle); 
    } 
    public void addWhiteCircle() { 

     Circle circle = new Circle(); 
     circle.x1 = 100 + shift; 
     circle.y1 = 30 ; 
     circle.w = 50 + step; 
     circle.h = 50 + step; 
     circle.color = new Color(255*65536+255*256+255);  
     this.whiteList.add(circle); 
    } 

    public void actionPerformed(ActionEvent e) { 
     Object source = e.getSource(); 
     d = 0; 
     if (source == addCircle) {  
      for (nCircle = 2; nCircle <= 5; nCircle++) { 
       if (nCircle == 2) { 
        d = 1; 
        step+=20; 
        shift += 20; 
        nCircle++; 
       } 
       else if (nCircle == 3) { 
        d = 2; 
        step+=20; 
        shift += 20; 
       } 
       else if (nCircle == 4) { 
        d=1; 
        step+=20; 
        shift += 20; 
       } 
       else if (nCircle == 5) 
        repaint(); // it should clear the window and start with one circle like the beginning 
       } 

       repaint(); 
      } 
     } 
} 

出力は、私はあなたの例を修正しました。この

Answer 1

ようにする必要があります。それは今働く。示されているように

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import java.util.List; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 
import javax.swing.WindowConstants; 

public class CircleList extends JPanel implements ActionListener, Runnable { 

    private static final int INTERVAL = 20; 

    private static final int INITIAL_DIAMETR = 20; 

    private int actualXPos; 

    private final List<Circle> circleList = new ArrayList<>(); 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new CircleList()); 
    } 

    @Override 
    public void run() { 
     JFrame frm = new JFrame(getClass().getSimpleName()); 
     frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     frm.getContentPane().add(this); 
     frm.pack(); 
     frm.setLocationRelativeTo(null); 
     frm.setVisible(true); 
    } 

    public CircleList() { 
     setLayout(new BorderLayout()); 
     setPreferredSize(new Dimension(500, 500)); 
     setBackground(Color.gray); 
     JButton addCircle = new JButton("Add Circle"); 
     add(addCircle, BorderLayout.SOUTH); 
     addCircle.addActionListener(this); 
     addCircle(); 
    } 

    @Override 
    public void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     for (Circle c : circleList) { 
      c.paint(g); 
     } 
    } 

    private void addCircle() { 

     Circle circle = new Circle(); 

     int num = circleList.size(); 
     circle.x1 = 40 + actualXPos; 
     circle.y1 = 30; 
     circle.w = 30 + INITIAL_DIAMETR * (num + 1); 
     circle.h = 30 + INITIAL_DIAMETR * (num + 1); 
     circle.color = num % 2 == 0 ? Color.BLACK : Color.WHITE; 
     circleList.add(circle); 
     actualXPos += circle.w + INTERVAL; 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     if (circleList.size() == 4) { 
      circleList.clear(); 
      actualXPos = 0; 
     } 
     addCircle(); 
     repaint(); 
    } 

    private static class Circle { 
     private int x1; 

     private int y1; 

     private int w; 

     private int h; 

     private Color color; 

     public void paint(Graphics g) { 
      g.setColor(color); 
      g.fillOval(x1, y1, w, h); 
     } 
    } 
}