myframe3.java~87~

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;
    DefaultTableModel tableModel;
    String[] columnNames={"书目条码","图书名","出版社","作者","印次","馆藏"};
    JTable table;
    MyFrame3(){
        super("图书馆馆藏记录");
        setSize(600,400);
        setLocation(200,200);
        setBackground(Color.pink);
        this.setVisible(true);

    }

    public void init3(){
        this.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    System.exit(0);
                }
            });

        setLayout(new BorderLayout());
        Panel p1=new Panel();
        Button b3=new Button("返回上一层");
        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){
            String st=km.getSelectedItem();
            String sql="SELECT*FROM libinfo WHERE(归属='"+st+"')ORDER BY 归属";
            //int rowCount=selectCount(sql);
            char ch=km.getSelectedItem().charAt(0);
            switch (ch){
        case '计':{this.tableModel=new DefaultTableModel(columnNames,0);
            this.table=new JTable(tableModel);
            this.add(new JScrollPane(table));
            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;}
        }//switch
}//if
    }
}