Java的GUI编程之列表和组合框的设计使用

  JScrollPane jsp = new JScrollPane(list2);

import java.applet.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class MyWindow extends JFrame implements ListSelectionListener{
  JList list1,list2;
  String news[]={"人民日报","新民晚报","浙江日报","文汇报"};
  String sports[]={"足球","排球","乒乓球","篮球"};
  JTextArea text;
  MyWindow(String s){
    super(s);
    Container con = getContentPane();
    con.setBackground(Color.BLUE);
    con.setLayout(new GridLayout(2,2));
    con.setSize(200,500);
    list1 = new JList(news);
    list1.setVisibleRowCount(3);
    list1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    list1.addListSelectionListener(this);
    list2 = new JList(sports);
    list2.setVisibleRowCount(2);
    list2.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    list2.addListSelectionListener(this);
    con.add(list1);
    con.add(list2);
    text= new JTextArea(10,20);
    con.add(text);
    this.setVisible(true);
    this.pack();
  }
  public void valueChanged(ListSelectionEvent e){// 每当选择值发生更改时调用
    if(e.getSource()==list1){
      text.setText(null);
      Object listValue = ((JList) e.getSource()).getSelectedValue();
      String seleName = listValue.toString();
      for(int i=0;i<news.length;i++)
        if(news[i].equals(seleName)){
          text.append(seleName+ "被选中\n");
        }
    }
    else if(e.getSource()==list2){
      text.setText(null);
      int tempList[] =list2.getSelectedIndices();
      for(int i=0;i<tempList.length;i++)
        text.append(sports[tempList[i]] + "被选中\n");
     }
   }
 }
public class Example6_3 extends Applet{
  MyWindow myWin = new MyWindow("列表示例");
}

public class Example6_4{
  public static void main(String args[]){
    ComboBoxDemo mycomboBoxGUI = new ComboBoxDemo();
  }
}
class ComboBoxDemo extends JFrame implements ActionListener,ItemListener{
  public static final int Width = 350;
  public static final int Height = 150;
  String proList[] = { "踢足球","打篮球","打排球" };
  JTextField text;
  JComboBox comboBox;
  public ComboBoxDemo(){
    setSize(Width,Height);
    setTitle("组合框使用示意程序");
    Container conPane = getContentPane();
    conPane.setBackground(Color.BLUE);
    conPane.setLayout(new FlowLayout());
    comboBox = new JComboBox(proList);
    comboBox.addActionListener(this);
    combobox.addItemListener(this);
    comboBox.setEditable(true);//响应键盘输入
    conPane.add(comboBox);
    text = new JTextField(10);
    conPane.add(text);
    this.setVisible(true);
  }
  public void actionPerformed(ActionEvent e){
    if(e.getSource()==comboBox)
      text.setText(comboBox.getSelectedItem().toString());
  }
  public void itemStateChanged(ItemEvent e){
    if(e.getSource()==comboBox){
      text.setText(comboBox.getSelectedItem().toString());
    }
  }
}