Question

Java swing组件显示的有问题

我加了三个复选框，可是鼠标移到窗口上的时候就消失了两个，只显示一个，这是为什么？为什么复选框不能一直显示呢？
代码如下：
import javax.swing.*;
public class JButtonTest {
public static void main(String args[])
{
JFrame frame=new JFrame("测试窗口");
frame.setBounds(20, 20, 300,400);
frame.setVisible(true);
JCheckBox hobbyChk=new JCheckBox("睡觉",true);
hobbyChk.setBounds(80, 170, 60, 26);
hobbyChk.setVisible(true);
frame.add(hobbyChk);
JCheckBox hobbyChk2=new JCheckBox("运动",true);
hobbyChk2.setBounds(150, 170, 60, 26);
hobbyChk2.setVisible(true);
frame.add(hobbyChk2);
JCheckBox hobbyChk3=new JCheckBox("爬山",true);
hobbyChk3.setBounds(220, 170, 60, 26);
hobbyChk3.setVisible(true);
frame.add(hobbyChk3);

}

}

Answer 1

你要先把JChechBox放到jpanel里,然后再把jpanel放到jframe里

代码:
import javax.swing.*;
public class JButtonTest{
public static void main(String args[])
{
JFrame frame=new JFrame("测试窗口");

JPanel panel=new JPanel();

frame.setBounds(20, 20, 300,400);
frame.setVisible(true);
JCheckBox hobbyChk=new JCheckBox("睡觉",true);
hobbyChk.setBounds(80, 170, 60, 26);
hobbyChk.setVisible(true);
panel.add(hobbyChk);
JCheckBox hobbyChk2=new JCheckBox("运动",true);
hobbyChk2.setBounds(150, 170, 60, 26);
hobbyChk2.setVisible(true);
panel.add(hobbyChk2);
JCheckBox hobbyChk3=new JCheckBox("爬山",true);
hobbyChk3.setBounds(220, 170, 60, 26);
hobbyChk3.setVisible(true);
panel.add(hobbyChk3);

frame.add(panel);

}

}

Answer 2

分接开关
34

Answer 3

dfhfjghkj

Answer 4

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