CardLayout布局_Java相关

CardLayout布局

rt。。。
----------------解决方案--------------------------------------------------------

程序代码：

class student
{
    student(String id, String name, double mark)
    {
        m_id = new String(id);
        m_name = new String(name);
        m_mark = mark;
    }
    String show_id (){ return m_id;}
    String show_name() {return m_name;}
    double show_mark() { return m_mark;}

    private String m_id = null;//学生的学号
    private String m_name = null;//学生的姓名
    private double m_mark = 0;//学生的成绩
}

class yxf extends Frame implements ActionListener
{
    LinkedList<student> list = null;//定义一个链表

    Panel panel_add = null;
    Panel panel_show = null;
    MenuBar menubar = null;
    Menu menu_add = null;
    Menu menu_show = null;
    CardLayout card = null;

    yxf()
    {
        super("学生管理系统");

        card = new CardLayout();
        setLayout(card);
        panel_add = new add(this, list);
        add("添加",panel_add);

        panel_show = new show(this, list);
        add("显示", panel_show);

        menu_add = new Menu("添加");
        menu_add.addActionListener(this);

        menu_show = new Menu("显示");
        menu_show.addActionListener(this);

        menubar = new MenuBar();
        menubar.add(menu_add);
        menubar.add(menu_show);
        setMenuBar(menubar);

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

        setVisible(true);
        validate();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if (e.getSource() == menu_add)
        {
            card.show(this, "添加");
            System.out.println(1);
        }
        else if (e.getSource() == menu_show)
        {
            card.show(this, "显示");
            System.out.println(2);
        }
    }
}

----------------解决方案--------------------------------------------------------

----------------解决方案--------------------------------------------------------
程序想实现学生的添加信息
点击显示可以显示所有的学生信息想这样子的：

----------------解决方案--------------------------------------------------------

本来是用CardLayout布局来达到在两个Panel panel_add 和panel_show之间进行切换的但是这里实现不成功

程序代码：

        menu_add = new Menu("添加");
        menu_add.addActionListener(this);

        menu_show = new Menu("显示");
        menu_show.addActionListener(this);

添加的事件没响应
----------------解决方案--------------------------------------------------------
这是全部的代码

程序代码：

import java.awt.Button;
import java.awt.CardLayout;
import java.awt.Container;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Iterator;
import java.util.LinkedList;

import javax.swing.Box;

public class main {
    public static void main(String args[])
    {
        new yxf();
    }
}

class student
{
    student(String id, String name, double mark)
    {
        m_id = new String(id);
        m_name = new String(name);
        m_mark = mark;
    }
    String show_id (){ return m_id;}
    String show_name() {return m_name;}
    double show_mark() { return m_mark;}

    private String m_id = null;//学生的学号
    private String m_name = null;//学生的姓名
    private double m_mark = 0;//学生的成绩
}

class yxf extends Frame implements ActionListener
{
    LinkedList<student> list = null;//定义一个链表

    Panel panel_add = null;
    Panel panel_show = null;
    MenuBar menubar = null;
    Menu menu_add = null;
    Menu menu_show = null;
    CardLayout card = null;

    yxf()
    {
        super("学生管理系统");

        card = new CardLayout();
        setLayout(card);
        panel_add = new add(this, list);
        add("添加",panel_add);

        panel_show = new show(this, list);
        add("显示", panel_show);

        menu_add = new Menu("添加");
        menu_add.addActionListener(this);

        menu_show = new Menu("显示");
        menu_show.addActionListener(this);

        menubar = new MenuBar();
        menubar.add(menu_add);
        menubar.add(menu_show);
        setMenuBar(menubar);

        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                System.exit(0);
            }
        });
        setBounds(100, 100, 280, 200);
        setVisible(true);
        validate();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if (e.getSource() == menu_add)
        {
            card.show(this, "添加");
            System.out.println(1);
        }
        else if (e.getSource() == menu_show)
        {
            card.show(this, "显示");
            System.out.println(2);
        }
    }
}
//定义添加信息的类
class add extends Panel implements ActionListener
{
    LinkedList<student> list = null;
    Button ack = null;//确认按钮
    Button cancel = null;//取消按钮

    TextField tf_id;
    TextField tf_name;
    TextField tf_mark;

//    TextArea ta_show = null;

    add(Container con, LinkedList<student> list)
    {
        this.list = list;

        Box box1 = Box.createVerticalBox();
        Box box2 = Box.createVerticalBox();

        box1.add(new Label("学号："));
        box1.add(Box.createVerticalStrut(4));
        box1.add(new Label("姓名："));
        box1.add(Box.createVerticalStrut(4));
        box1.add(new Label("成绩："));
        box1.add(Box.createVerticalStrut(4));

        cancel = new Button("重置");
        cancel.addActionListener(this);
        box1.add(cancel);

        tf_id = new TextField(10);
        tf_name = new TextField(10);
        tf_mark = new TextField(10);
        box2.add(tf_id);
        box2.add(Box.createVerticalStrut(4));
        box2.add(tf_name);
        box2.add(Box.createVerticalStrut(4));
        box2.add(tf_mark);
        box2.add(Box.createVerticalStrut(4));

        ack = new Button("确定");
        ack.addActionListener(this);
        box2.add(ack);

//        ta_show = new TextArea(10, 20);

        add(box1);
        add(box2);
//        add(ta_show);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        if (e.getSource() == cancel)
        {
            tf_id.setText(null);
            tf_name.setText(null);
            tf_mark.setText(null);
        }
        else if (e.getSource() == ack)
        {
            if (null == list)
            {
                list = new LinkedList<student>();
            }

            list_add();
//            show_list();
        }
    }
    //向链表中添加数据
    void list_add()
    {
        String str_id = new String(tf_id.getText());
        String str_name = new String(tf_name.getText());
        double dou = 0;
        try
        {
            dou = Double.parseDouble(tf_mark.getText());
            list.add(new student(str_id, str_name, dou));
        }
        catch (NumberFormatException e)
        {
            System.out.println("错误:"+e.getMessage());
        }
    }
//    void show_list()
//    {
//        if (null == list)
//        {
//            ta_show.append("没有数据\n");
//
//            return;
//        }
//        try
//        {
//            ta_show.setText(null);
//            Iterator<student> iter = list.iterator();
//
//            while (iter.hasNext())
//            {
//                student temp = (student)iter.next();
//                ta_show.append("学号："+temp.show_id()+" 姓名："+temp.show_name()+" 成绩："+temp.show_mark()+"\n");
//            }
//        }
//        catch (NullPointerException e)
//        {
//            System.out.println("Iterator " +e.getMessage());
//        }
//    }
}

//定义显示信息的类
class show extends Panel
{
    LinkedList<student> list = null;
    TextArea ta_show = null;

    show(Container con, LinkedList<student> list)
    {
        this.list = list;

        ta_show = new TextArea(10, 20);
        add(ta_show);
        show_list();
        setVisible(true);
        validate();
    }
    public void show_list()
    {
        if (null == list)
        {
            ta_show.append("没有数据\n");

            return;
        }
        try
        {
            Iterator<student> iter = list.iterator();

            while (iter.hasNext())
            {
                student temp = (student)iter.next();
                ta_show.append("学号："+temp.show_id()+" 姓名："+temp.show_name()+" 成绩："+temp.show_mark()+"\n");
            }
        }
        catch (NullPointerException e)
        {
            System.out.println("Iterator " +e.getMessage());
        }
    }
}

----------------解决方案--------------------------------------------------------
add(String s, Componnment b)
知道Panel是容器

根据add(String s, Componnment b) 好像是不能像我那样子用但是没有报异常就忽略了
现在的主要的问题是点击菜单没有反应
----------------解决方案--------------------------------------------------------
菜单项用MenuItem，不是用menu类。。
windowsIE浏览器坐例子：
“File”菜单是用menu类。。
“退出”菜单项用menuItem类。。
整个是menuBar类。。

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诸葛修勤积分 +10 2011-4-23 22:58