使用组件将 jlabel 添加到 jframe

2022-01-24 00:00:00 java swing jlabel jframe

我有两节课，

我的主类创建了一个框架，我希望另一个类向它添加内容.一点阅读 arroudn 告诉我我应该使用组件来执行此操作，但是当我运行我的代码时，框架是空的.

My main class creates a frame and I want another class to add content to it. A bit of reading arroudn told me I should use components to do this however when I run my code the frame is empty. 

 public static void main(String[] args)
 {
    // create frame
    JFrame frame = new JFrame();
    final int FRAME_WIDTH = 800;
    final int FRAME_HEIGHT = 600;
    // set frame attributes
    frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
    frame.setTitle("My Frame");
    frame.setVisible(true);

    Component1 Com = new Component1();
    Component add = frame.add(Com);

}

我的组件类创建一个 JLabel

My Component class creates a JLabel

public class Component1 extends JComponent {

   public void paintComponent()
   {
       JLabel label = new JLabel("<html>Some Text</html>");
   }
}

我没有收到任何编译错误，但是我的 JFrame 中没有收到任何文本.

I don't get any compile errors, however I dont get any text in my JFrame.

谁能解释我做错了什么?

Can anyone explain what I'm doing wrong?

克里斯

推荐答案

您需要添加 JLabel.最好扩展 JPanel 而不是 JComponent 因为它有一个默认的 布局管理器 并且将显示任何添加的组件，而无需设置组件大小.paintComponent 用于自定义绘画顺便说一句.

You need to add the JLabel. Also better to extend JPanel instead of JComponent as it has a default layout manager and will make any added components appear without the need to set component sizes. paintComponent is used for custom painting BTW.

public class Component1 extends JPanel {

   Component1() {
      JLabel label = new JLabel("<html>Some Text</html>");
      add(label);
   }
}

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