jcomboBox 级联问题

Question

有三个JComboBox
JComboBox comboBoxCountry=new JCombobox();//国家
JComboBox comboBoxProvince=new JCombobox();//省份
JComboBox comboBoxCity=new JCombobox();//城市
当我选中comboBoxCountry的一个国家时，将该国家所含的省份添加到comboBoxProvince中，当我再选中comboBoxProvince中的一个省份时，将该省份所含的城市添加到comboBoxCity中,也就是一个三层级联

Answer 1

import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;public class ItemEventTest {
private JFrame frame;
private JLabel proLabel,cityLabel;
private JComboBox proBox,cityBox;
private String[] proStr;
private String[][] cityStr;


public ItemEventTest(String[] proStr,String[][] cityStr){
frame=new JFrame("Item Event Test！");
proLabel=new JLabel("省份：");
cityLabel=new JLabel("城市：");

this.proStr=proStr;
this.cityStr=cityStr;
proBox=new JComboBox(proStr);
cityBox=new JComboBox(cityStr[0]);
frame.setLayout(new FlowLayout());

frame.add(proLabel);
frame.add(proBox);
frame.add(cityLabel);
frame.add(cityBox);
}

public void addEventHandler(){
proBox.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent arg0) {
int index=proBox.getSelectedIndex();
cityBox.removeAllItems();
for(int i=0;i<cityStr[index].length;i++){
cityBox.addItem(cityStr[index][i]);
}
}
});
}

public void showMe(){
addEventHandler();
frame.setSize(400,300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args){
String[] proStr={"山东","山西","河北","河南","江苏","浙江"};
String[][] cityStr={
{"济南","烟台","青岛","潍坊","泰安"},
{"太原","大同","平遥","临汾","晋中"},
{"石家庄","保定","唐山","邯郸","秦皇岛"},
{"郑州","安阳","洛阳","开封","南阳"},
{"南京","苏州","扬州","常州","无锡"},
{"杭州","温州","宁波","金华","义乌"}
};
new ItemEventTest(proStr,cityStr).showMe();
}}
LZ这个事二级级联，希望对你有帮助