如果框不够大，面板会相互重叠

Question

我有这个gui;当高度不够大时，窗格会相互重叠。我必须设置它至少200，所以我可以完全看到这两行;但是当它设置为200时，我最后会有一个很大的空行，我不希望这样。我怎么能解决这个问题？感谢。

import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;

public class MyFrame extends JFrame {

    JButton panicButton;
    JButton dontPanic;
    JButton blameButton;
    JButton newsButton;
    JButton mediaButton;
    JButton saveButton;
    JButton dontSave;

    public MyFrame() {
        super("Crazy App");
        setSize(400, 150);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel row1 = new JPanel();
        panicButton = new JButton("Panic");
        dontPanic = new JButton("No Panic");
        blameButton = new JButton("Blame");
        newsButton = new JButton("News");
        //adding first row
        GridLayout grid1 = new GridLayout(4, 2, 10, 10);
        setLayout(grid1);
        FlowLayout flow1 = new FlowLayout(FlowLayout.CENTER, 10, 10);
        row1.setLayout(flow1);
        row1.add(panicButton);
        row1.add(dontPanic);
        row1.add(blameButton);
        row1.add(newsButton);
        add(row1);
        //adding second row
        JPanel row2 = new JPanel();
        mediaButton = new JButton("Blame");
        saveButton = new JButton("Save");
        dontSave = new JButton("No Save");
        GridLayout grid2 = new GridLayout(3, 2, 10, 10);
        setLayout(grid2);
        FlowLayout flow2 = new FlowLayout(FlowLayout.CENTER, 10, 10);
        row2.setLayout(flow2);        
        row2.add(mediaButton);
        row2.add(saveButton);
        row2.add(dontSave);
        add(row2);       

        setVisible(true);       

    }

    public static void main(String[] args) {
        MyFrame frame = new MyFrame();
    }   
}

Answer 1

1. 原始代码在两个不同的场合设置一个面板的布局。为清楚起见，请在构造函数中设置一次。
2. 第二个布局指定了3行
3. 调用顶级容器上的pack()，使GUI缩小到组件所需的最小值。

最终结果



---

import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;

public class MyFrame17 extends JFrame {

    JButton panicButton;
    JButton dontPanic;
    JButton blameButton;
    JButton newsButton;
    JButton mediaButton;
    JButton saveButton;
    JButton dontSave;

    public MyFrame17() {
        super("Crazy App");
        setLayout(new GridLayout(2, 2, 10, 10));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel row1 = new JPanel();
        panicButton = new JButton("Panic");
        dontPanic = new JButton("No Panic");
        blameButton = new JButton("Blame");
        newsButton = new JButton("News");
        FlowLayout flow1 = new FlowLayout(FlowLayout.CENTER, 10, 10);
        row1.setLayout(flow1);
        row1.add(panicButton);
        row1.add(dontPanic);
        row1.add(blameButton);
        row1.add(newsButton);
        add(row1);
        //adding second row
        JPanel row2 = new JPanel();
        mediaButton = new JButton("Blame");
        saveButton = new JButton("Save");
        dontSave = new JButton("No Save");
        FlowLayout flow2 = new FlowLayout(FlowLayout.CENTER, 10, 10);
        row2.setLayout(flow2);        
        row2.add(mediaButton);
        row2.add(saveButton);
        row2.add(dontSave);
        add(row2);       

        pack();
        setVisible(true);       
    }

    public static void main(String[] args) {
        MyFrame17 frame = new MyFrame17();
    }   
}

进一步提示

1. 不要扩展框架，只使用一个实例。
2. 在面板中构建整个GUI，然后可以将其添加到框架，小程序，对话框中。
3. 在开发测试类时，给它们一个比MyFrame更明智的名称。要添加的好词是Test，然后考虑一下正在测试的内容。这是关于按钮的布局，因此ButtonLayoutTest可能是一个好名字。
4. 应该在EDT上启动GUI。