java - 多个自定义 JComponents，只显示一个

Question

我正在尝试制作一个可以在我的程序中反复使用的自定义 JComponent。我已经为我需要做什么设置了一个简单的测试，但我什至无法让它工作。

class MyComponent extends JComponent {
    private String string = "";
    private int x;
    private int y;

    public MyComponent(String string, int x, int y){
        this.string = string;
        this.x = x;
        this.y = y;
    }
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawString(string, x, y);
    }

}

public class GObject {
    public static void main(String[] args) {
        JFrame Window = new JFrame();
        Window.setBounds(30, 30, 300, 300);
        Window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        MyComponent com1 = new MyComponent("test123", 100, 100);
        MyComponent com2 = new MyComponent("test456", 20, 20);
        Window.add(com1);
        Window.add(com2);

        Window.setVisible(true);
    }
}

从技术上讲，我创建的是一个可以放置在任何地方的 JLabel。您会希望在这些坐标处看到两个字符串“test123”和“test456”。但是我只看到显示的最后一个字符串。

JFrame with only one string of text displayed.

编辑:

让我上传我的实际代码。我试图通过简化我的实际代码来简化事情。

这是我的:

import java.awt.Graphics;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class HeatG2 {
    public static JFrame frame = new JFrame("Test");

    public static void main(String[] args){
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Sheet sheet = new Sheet();
        frame.add(sheet);
        frame.setSize(1000, 800);
        frame.setVisible(true);
    }

}

@SuppressWarnings("serial")
class Sheet extends JPanel{
    public Heat test1;
    public Heat test2;

    public Sheet(){
        test1 = new Heat();
        test1.setPosition(10, 10);
        test1.setHeat(1);
        test1.setHeight(150);
        add(test1);

        test2 = new Heat();
        test2.setPosition(10, 310);
        test2.setHeat(2);
        test2.setHeight(150);
        add(test2);
    }
}

@SuppressWarnings("serial")
class Heat extends JComponent{
    private int x;
    private int y;
    private int height;
    private int heat;
    private String driver1 = "";
    private String driver2 = "";

    public String getDriver1(){
        return driver1;
    }

    public String getDriver2(){
        return driver2;
    }

    public void setDriver1(String driver1){
        this.driver1 = driver1;
        System.out.println(this.driver1);
    }

    public void setDriver2(String driver2){
        this.driver2 = driver2;
        System.out.println(this.driver2);
    }

    public void setPosition(int x, int y){
        this.x = x;
        this.y = y;
    }

    public void setHeight(int height){
        this.height = height;
    }

    public void setHeat(int heat){
        this.heat = heat;
    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.drawString(driver1, x, y);
        g.drawLine(x, y, x+250, y);
        g.drawLine(x+250, y, x+250, y+height);
        g.drawString(driver2, x, y+height);
        g.drawLine(x, y+height, x+250, y+height);
    }
}

需要在工作表 (JPanel) 的指定位置添加多个加热。然后 Jpanel 将被添加到 JWindow。

编辑 2:

我最终通过不扩展组件解决了这个问题。我将该类用作可绘制对象的模板。

Answer 1

您需要检查布局。如果它是 BorderLayout(Default)，它将只显示最后一个尝试使用不同的布局。类似于 GridLayout 或 FlowLayout