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java - JCheckbox 未显示

转载 作者:行者123 更新时间:2023-12-01 23:16:35 25 4
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我正在尝试创建一个 java GUI,但在显示复选框时遇到一些问题。我查看了 oracle 教程并包含了他们拥有的所有代码,但我不确定我缺少什么。有什么想法吗?

public class HPAProgram {
public static void main(String[] args) {
MapWindow map = new MapWindow();
}
}

import java.awt.event.*;
import javax.swing.*; //notice javax
public class MapWindow extends JFrame
{
private static final int WIDTH = 600, HEIGHT = 800;

SettingsButtonsPanel button_panel = new SettingsButtonsPanel();

public MapWindow()
{
setLocationRelativeTo(null);
setTitle("HPA* Test");
setSize(WIDTH, HEIGHT);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);

add(button_panel);
}

}

import java.awt.event.*;

import javax.swing.*; //notice javax
public class SettingsButtonsPanel extends JPanel implements ItemListener{
private static final int WIDTH = 600, HEIGHT = 200;
private static final int NUM_MAP_TYPE = 2;

private JCheckBox[] map_type;

JPanel panel = new JPanel();

public SettingsButtonsPanel(){
this.setBounds(0,0,WIDTH, HEIGHT);

map_type = new JCheckBox[NUM_MAP_TYPE];

map_type[0] = new JCheckBox("Sparse");
map_type[0].setSelected(true);
map_type[0].setVisible(true);
map_type[0].setLocation(0,0);
map_type[0].setSize(100,100);


map_type[1] = new JCheckBox("Maze");
map_type[1].setSelected(false);

for(int i = 0; i < NUM_MAP_TYPE; i++)
map_type[i].addItemListener(this);
}

public void itemStateChanged(ItemEvent e)
{
Object source = e.getItemSelectable();
//if(source == )
}
}

最佳答案

for(int i = 0; i < NUM_MAP_TYPE; i++) {
map_type[i].addItemListener(this);
this.add(map_type[i]);
}

但最好为面板使用 LayoutManager(例如 BoxLayout)。

关于java - JCheckbox 未显示,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21119994/

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