注意：

Question

这是我的代码

import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
public class Test extends JFrame{
    private JButton by;
    private JButton bn;
    JLabel startQuestion;

    public Test() {
        JPanel p = new JPanel();
        by = new JButton("Yes");
        bn = new JButton("No");
        startQuestion = new JLabel("Would you like to start?");
        p.setLayout(null);
        by.setBounds(180, 250, 70, 45);
        bn.setBounds(250, 250, 70, 45);
        startQuestion.setLocation(195, 240);
        p.add(by);
        p.add(bn);
        add(startQuestion);
        add(p);
        setDefaultCloseOperation(3);
        setSize(500, 500);
        setVisible(true);
    }

    public static void main(String...args) {
        new Test();
    }
}

没有语法错误，但是我的Jlabel没有添加（按钮工作正常）。我不想从null更改布局，因为我希望能够定义按钮和标签的位置。有谁知道为什么这不起作用？

Answer 1

此问题与JLabel won't show with JPanel.setLayout(null). Why?

类似

要在此处回答，请添加如下所示的行：

    startQuestion.setBounds(150, 150, 200, 20);

Answer 2

import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
public class Test extends JFrame{
    private JButton by;
    private JButton bn;
    JLabel startQuestion;
        public Test() {
        JPanel p = new JPanel();
        by = new JButton("Yes");
        bn = new JButton("No");
        startQuestion = new JLabel("Would you like to start?");
        //p.setLayout(null);
        by.setBounds(180, 250, 70, 45);
        bn.setBounds(250, 250, 70, 45);
        startQuestion.setLocation(195, 240);
        p.add(by);
        p.add(bn);
        add(startQuestion);
        add(p);
        setDefaultCloseOperation(3);
        setSize(500, 500);
        setVisible(true);
        }
        public static void main(String...args) {
        new Test();
    }
}

注意：

您需要发表评论setlayout(null);

出于某种原因，我的JPanel没有出现

2 个答案:

注意：