Question

我在将侦听器与southButton相关联以处理事件时遇到了问题。

 (southButton.addActionListener(new RandomColorListener(drawPanel));)

当用户点击南部地区的JButton时，填充color1的矩形应该全部变为随机颜色，而填充了color2的矩形不应该改变。一秒点击JButton应该使矩形充满color2 all 更改为随机颜色，而矩形填充随机第一次点击的颜色应该保持相同的颜色。

用户应该能够无限期地继续单击按钮，每次单击一组矩形将填充随机颜色。在每种情况下，要改变的矩形应该是保持不变的矩形最后一次点击（换句话说，颜色变化应该在两组矩形之间交替）。这意味着每次单击只有一组矩形应该改变颜色。

我试图将drawPanel传递给randomListener，但是出现了这个Java错误。

Java错误：类中的构造函数RandomColorListener RectanglesGUI.RandomColorListener不能应用于给定类型。

有人可以告诉我如何在class randomListener

中使用drawPanel

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

        public class RectanglesGUI
        {
            JFrame frame;
            RectangleDrawPanel drawPanel;
            Color color1 = Color.orange;
            Color color2 = Color.blue;
            //Set fixed number of rows and columns
            protected static final int ROWS = 5;
            protected static final int COLS = 5;
            private List<Color>colors;


            public static void main (String[] args)
            {
                RectanglesGUI gui = new RectanglesGUI();
                gui.go();
            }

    //this method sets up the JFrame, adds the button and drawpanel to the frame and adds the ActionListener to the button
        public void go()
        {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        drawPanel = new RectangleDrawPanel();
        frame.getContentPane().add(BorderLayout.CENTER, drawPanel);

                //Add a JButton to the SOUTH region of the JFrame using BorderLayout. Set the text on the button.
                JButton southButton = new JButton("Click to CHANGE color on alternate set of Rectangles");
                frame.getContentPane().add(BorderLayout.SOUTH, southButton);


                frame.setSize(600,600);
                frame.setVisible(true);

                //Relate a listener to the southButton to handle events.
                southButton.addActionListener(new RandomColorListener(drawPanel));
                //Relate another listener to northButton.
                northButton.addActionListener(new ResetListener() {});
    }

        //Inner class to implement actionListener and listen to the JButton in the SOUTH region
        class RandomColorListener implements ActionListener
        {
                private RectangleDrawPanel myPanel;
                public RectangleDrawPanel (RectangleDrawPanel aPanel)
                {
                    this.myPanel = aPanel;
                }
                @Override
                public void actionPerformed (ActionEvent e)
                {
                    int r = (int)(Math.random()*256);
                    int g = (int)(Math.random()*256);
                    int b = (int)(Math.random()*256);
                    color1 = new Color(r,g,b);

                    RectangleDrawPanel();
                }
        }


    class RectangleDrawPanel extends JPanel{
                @Override
        public void paintComponent (Graphics g)
                {
                    //Store 2 colors Alternatively in the Arraylist using for loop
                    int length = ROWS * COLS;
                    colors = new ArrayList<>(length);
                    for(int i=1;i<=length;i++)
                    {
                        double count;
                        count = i;
                        if(count%2 == 0)
                            {colors.add(color2);}
                        else
                            {colors.add(color1);}
                    }


                    super.paintComponent(g);
                    Graphics2D g2=(Graphics2D)g;

                    //Distribute the rectangles Evenly using for loop and Fill them with colors (from ArrayList) 
                    int rectWidth = getWidth()/5; 
                    int rectHeight = getHeight()/5; 

                    for (int y = 0; y < ROWS; y++) 
                    {
                        for (int x = 0; x < COLS; x++) 
                        {
                            int index=(y * COLS) + x;
                            g2.setColor(colors.get(index));
                            g2.fillRect(x * rectWidth, y * rectHeight, rectWidth, rectHeight);
                        }
                    }


        }
    }
}

Java错误：类RectanglesGUI.RandomColorListener中的构造函数RandomColorListener无法应用于给定类型

0 个答案: