将JPanel添加到JFrame [英] Adding JPanel to JFrame

问题描述

我有一个将JPanel添加到JFrame的程序:

I have a program in which a JPanel is added to a JFrame:

public class Test{

    Test2 test = new Test2();
    JFrame frame = new JFrame();

    Test(){

    ...
    frame.setLayout(new BorderLayout());
    frame.add(test, BorderLayout.CENTER);
    ...

    }

    //main

    ...

    }

    public class Test2{

    JPanel test2 = new JPanel();

    Test2(){

    ...

    }

}

我收到一条错误消息，要求我将面板"的类型更改为组件".我要解决此错误吗? 它想让我做:组件面板= new Component();

I get an error asking me to change type of 'panel' to 'component'. I do I fix this error? It wants me to do: Component panel = new Component();

推荐答案

public class Test{

Test2 test = new Test2();
JFrame frame = new JFrame();

Test(){
...
frame.setLayout(new BorderLayout());
frame.add(test, BorderLayout.CENTER);
...
}

//main
...
}

//public class Test2{
public class Test2 extends JPanel {

//JPanel test2 = new JPanel();

Test2(){
...
}

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