myframe3.java~71~

简单的代码

package xue;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;


public class MyFrame3 extends Frame implements ItemListener{
    Choice km;
    TextField tf3;
    MyFrame3(){
        super("图书馆馆藏记录");
        setSize(600,400);
        setLocation(200,200);
        setBackground(Color.pink);
        this.setVisible(true);

    }
    /*public static void main(String[] args){
        MyFrame mf3=new MyFrame();
         mf3.setTitle("图书馆馆藏记录");
         new MyFrame3().init3();
         mf3.setVisible(true);
        mf3.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    System.exit(0);
                }
            });

    }*/
    public void init3(){
        setLayout(new BorderLayout());
        Panel p1=new Panel();
        Button b3=new Button("返回");
        b3.setBackground(Color.green);
        tf3=new TextField();
        km=new Choice();
        km.addItemListener(this);
        km.add("分类查询");
        km.add("计算机");
        km.add("经济");
        km.add("生物");
        km.add("化学");
        km.add("外语");
        km.add("地理");
        km.add("教育");
        km.add("音乐");
        this.add(p1,BorderLayout.NORTH);
        p1.setLayout(new GridLayout(1,2,15,0));
        p1.add(km);
        p1.add(tf3);
        p1.add(b3);
        //this.add(table);
    }

    public void itemStateChanged(ItemEvent e){
        if(e.getItemSelectable()==km){

        char ch=km.getSelectedItem().charAt(0);
            switch (ch){
        case '计':tf3.setText("计算机学科");break;
        case '经':tf3.setText("经济学");break;
        case '生':tf3.setText("生物学");break;
        case '化':tf3.setText("化工科");break;
        case '外':tf3.setText("外语类");break;
        case '地':tf3.setText("地理科");break;
        case '教':tf3.setText("教育学");break;
        case '音':tf3.setText("音乐类");break;

        }




    }
}