swiminfo.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

import java.awt.*;
import java.awt.event.*;

public class SwimInfo extends Frame
implements ActionListener {
    SwimData sdata, sxdata = null;
    List swList, cloneList;
    Button Clone, Refresh, Quit;
    Swimmer sw;

    public SwimInfo() {
        super("Prototype example");
        sdata = new TimeSwimData("swimmers.txt");

        setGUI();
        loadswList();
    }
    //-----------------------------------
    public void actionPerformed(ActionEvent e) {
        Object obj = e.getSource();
        if (obj == Clone)
            cloneAndLoad();
        if (obj == Refresh)
            loadswList();
        if (obj == Quit)
            System.exit(0);
    }
    //-----------------------------------
    private void cloneAndLoad() {
       try{
            sxdata = (SwimData)sdata.cloneMe();
            sxdata.sort();
        }
        catch(CloneNotSupportedException e){}
        
        cloneList.removeAll();
        //now print out sorted values from clone
        for (int i=0; i< sxdata.size(); i++) {
            sw = sxdata.getSwimmer(i);
            cloneList.add(sw.getName()+" "+sw.getTime());
        }
    }
    //-----------------------------------
    private void loadswList() {
        swList.removeAll();
        for (int i=0; i< sdata.size(); i++) {
            sw = sdata.getSwimmer(i);
            swList.add(sw.getName()+" "+sw.getTime());
        }
    }
    //-----------------------------------

    private void setGUI() {
        setLayout(new GridLayout(1,3));
        setBackground(Color.lightGray);
        swList = new List(15);
        cloneList = new List(15);
        Panel cp = new Panel();
        add(swList);
        add(cp);
        add(cloneList);
        Clone = new Button("Clone -->");
        Refresh = new Button("<--Refresh");
        Quit = new Button("Quit");
        cp.setLayout(new GridLayout(3,1));
        Panel p1 = new Panel();
        cp.add(p1);
        p1.add(Clone);
        Panel p2 = new Panel();
        cp.add(p2);
        p2.add(Refresh);
        Panel p3 = new Panel();
        cp.add(p3);
        p3.add(Quit);
        Clone.addActionListener(this);
        Refresh.addActionListener(this);
        Quit.addActionListener(this);
        setBounds( 100,100,500,400);
        setVisible(true);
    }
    //-----------------------------------
    static public void main(String argv[]) {
        new SwimInfo();
    }
}