Question

java大牛来!!下拉菜单-复选框-单选框-用法

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

public class Test001 extends JFrame {
public Test001() {

JComboBox combobox;// 下拉菜单
JCheckBox checkbox;// 复选框
JRadioButton radiobutton;// 单选框
checkbox = new JCheckBox("复选框", true);
radiobutton = new JRadioButton("单选框");
combobox = new JComboBox();
/* -------------------------------------*/
Container c = this.getContentPane();
c.setLayout(null);
// 添加复选框
c.add(checkbox);
checkbox.setLocation(40, 0);
checkbox.setSize(100, 20);

// 添加单选框
c.add(radiobutton);
radiobutton.setLocation(160, 0);
radiobutton.setSize(100, 20);

// 添加下拉菜单
c.add(combobox);
combobox.addItem("北京");
combobox.addItem("上海");
combobox.addItem("深圳");
combobox.addItem("平顶山");
combobox.setLocation(100, 60);
combobox.setSize(100, 20);
// jframe设置
setSize(300, 200);
this.setLocation(300, 300);
setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args) {
Test001 mytest = new Test001();
}

}

这几个东西，具体怎么用，，，

我只会设置不会用，，，

具体一般怎么用，，，请告诉我，，，
谢谢了，
是不是还要配合ActionListener

请写个简单些的代码告诉我
谢谢了
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.一楼代码有问题啊

Answer 1

package fxw.xjtu.cn;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.MenuItem;

public class Test {

protected Shell shell;

/**
* Launch the application.
* @param args
*/
public static void main(String[] args) {
try {
Test window = new Test();
window.open();
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* Open the window.
*/
public void open() {
Display display = Display.getDefault();
createContents();
shell.open();
shell.layout();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}

/**
* Create contents of the window.
*/
protected void createContents() {
shell = new Shell();
shell.setSize(450, 300);
shell.setText("SWT Application");

Menu menu = new Menu(shell, SWT.BAR);
shell.setMenuBar(menu);

MenuItem menuItem = new MenuItem(menu, SWT.CASCADE);
menuItem.setText("\u4E3B\u83DC\u53551");

Menu menu_1 = new Menu(menuItem);
menuItem.setMenu(menu_1);

MenuItem menuItem_2 = new MenuItem(menu_1, SWT.CASCADE);
menuItem_2.setText("\u4E0B\u62C9\u83DC\u53551.1");

Menu menu_3 = new Menu(menuItem_2);
menuItem_2.setMenu(menu_3);

MenuItem menuItem_3 = new MenuItem(menu_3, SWT.CHECK);
menuItem_3.setText("\u590D\u9009\u68461");
menuItem_3.addSelectionListener(new SelectionAdapter(){
public void widgetSelected(SelectionEvent e){
MessageDialog.openInformation(shell, "菜单的监听器", "您选择了："+e.getSource());
}
});

MenuItem menuItem_4 = new MenuItem(menu_3, SWT.CHECK);
menuItem_4.setText("\u590D\u9009\u68462");
menuItem_4.addSelectionListener(new SelectionAdapter(){
public void widgetSelected(SelectionEvent e){
MessageDialog.openInformation(shell, "菜单的监听器", "您选择了："+e.getSource());
}
});

MenuItem menuItem_5 = new MenuItem(menu_3, SWT.CHECK);
menuItem_5.setText("\u590D\u9009\u68463");
menuItem_5.addSelectionListener(new SelectionAdapter(){
public void widgetSelected(SelectionEvent e){
MessageDialog.openInformation(shell, "菜单的监听器", "您选择了："+e.getSource());
}
});

new MenuItem(menu_3, SWT.SEPARATOR);

MenuItem menuItem_6 = new MenuItem(menu_3, SWT.RADIO);
menuItem_6.setText("\u5355\u9009\u68461");

MenuItem menuItem_7 = new MenuItem(menu_3, SWT.RADIO);
menuItem_7.setText("\u5355\u9009\u68462");

MenuItem menuItem_8 = new MenuItem(menu_1, SWT.NONE);
menuItem_8.setText("\u4E0B\u62C9\u83DC\u53551.2");

MenuItem menuItem_9 = new MenuItem(menu_1, SWT.NONE);
menuItem_9.setText("\u4E0B\u6765\u83DC\u53551.3");

MenuItem menuItem_1 = new MenuItem(menu, SWT.CASCADE);
menuItem_1.setText("\u4E3B\u83DC\u53552");

Menu menu_2 = new Menu(menuItem_1);
menuItem_1.setMenu(menu_2);

MenuItem menuItem_10 = new MenuItem(menu_2, SWT.NONE);
menuItem_10.setText("\u4E0B\u62C9\u83DC\u53552.1");

MenuItem menuItem_11 = new MenuItem(menu_2, SWT.NONE);
menuItem_11.setText("\u4E0B\u62C9\u83DC\u53552.2");

}
}
这个是用SWT写的，很好用。具体的应用就是个menuitem添加选中的监听器，这里是在复选框选中时，弹出消息框，显式该选项被选中。