Question

好吧标题解释了，基本上setBounds(int x, int y, int width, int height)方法并不像我想要的那样工作，因为没有显示任何东西。这段代码的目的是从一些文本字段中获取文本，然后关闭该窗口，并将它们转换为JLabel个对象以显示在屏幕上，但它并没有这样做。以下是一些代码片段：

public class Create implements ActionListener {

    private JTextArea t1, t2, t3;
    private String s1 = t1.getText();
    private String s2 = t2.getText();
    private String s3 = t3.getText();
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == b1) {
            dispose();
            setVisible(false);
            t1 = new JTextArea(7, 17);
            t2 = new JTextArea(7, 17);
            t3 = new JTextArea(7, 17);

            JFrame frame2 = new JFrame();
            frame2.add(new Test(s1,s2,s3));
            frame2.setTitle("Title");  
            frame2.setSize(700,500);
            frame2.setResizable(true);
            frame2.setLocationRelativeTo(null);
            frame2.setVisible(true);
        }
    }
}

新课程Test：

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

@SuppressWarnings("serial")
public class Test extends JPanel implements ActionListener {

    private int w = 250, velx = 2, x = 330;
    Timer tm = new Timer(50,this);

    public Test(String s1, String s2, String s3) {
        setText(s1, s2, s3);
    }

    public void setText(String s1, String s2, String s3) {
        JLabel label1 = new JLabel(s1);
        label1.setBounds(100, 100, 500, 500);
        JLabel label2 = new JLabel(s2);
        label2.setBounds(75, 20, 100, 20);
        JLabel label3 = new JLabel(s3);
        label3.setBounds(100, 20, 100, 20);
    }
}

*****字符串不会在矩形*****上绘制

public void paintComponent(Graphics g){


       super.paintComponent(g);

       g.drawString("something", 300, 50);
       g.drawString("something", 50, 100);
       g.drawString("something", 50, 150);



}

public void paint(Graphics g){
     tm.setInitialDelay(10000);
     super.paint(g);
     Graphics2D graph2 = (Graphics2D)g;

     Shape Rect1 = new Rectangle2D.Float(330, 30, 250, 390);
     graph2.setColor(Color.CYAN);
     graph2.fill(Rect1);

     Shape Rect2 = new Rectangle2D.Float(x, 30, w, 390);
     graph2.setColor(Color.RED);
     graph2.fill(Rect2);

     tm.start();


    }

Answer 1

您实际上需要将这些标签添加到JPanel，以便它们可以显示

 public void setText(String s1, String s2, String s3) {
        JLabel label1 = new JLabel(s1);
        label1.setBounds(100, 100, 500, 500);
        JLabel label2 = new JLabel(s2);
        label2.setBounds(75, 20, 100, 20);
        JLabel label3 = new JLabel(s3);
        label3.setBounds(100, 20, 100, 20);
        add(label1);// Add the label to your current JPanel
        add(label2);
        add(label3);

    }

当您需要绝对定位时，您需要将布局明确设置为Null

JPanel#setLayout(null)

<强>更新

如何在JLabel上绘制矩形。

覆盖paintComponent的{{1}}方法。它应该首先调用JLabel，这样你就得到了JLabel包含的内容，然后在那之后添加你自己的绘图代码。

super.paintComponent

setBounds方法是否正常工作？

1 个答案: