Java中CardLayout的使用

Posted 2020-10-01

【例1】代码：

 1 import java.awt.CardLayout;
 2 import java.awt.GridLayout;
 3 import java.awt.event.ActionEvent;
 4 import java.awt.event.ActionListener;
 5 import java.awt.event.WindowAdapter;
 6 import java.awt.event.WindowEvent;
 7 
 8 import javax.swing.JButton;
 9 import javax.swing.JFrame;
10 import javax.swing.JLabel;
11 import javax.swing.JPanel;
12 
13 public class TestCardLayout extends JFrame implements ActionListener {
14      CardLayout cl;
15      JPanel nav = new JPanel();
16      JPanel main = new JPanel();
17      JPanel jp1 = new JPanel();
18      JPanel jp2 = new JPanel();
19      JPanel jp3 = new JPanel();
20      JPanel jp4 = new JPanel();
21      JPanel jpFirst = new JPanel();
22      JPanel jpNext = new JPanel();
23      JPanel jpPrevious = new JPanel();
24      JPanel jpLast = new JPanel();
25      JLabel jl1 = new JLabel("第一张");
26      JLabel jl2 = new JLabel("第二张");
27      JLabel jl3 = new JLabel("第三张");
28      JLabel jl4 = new JLabel("第四张");
29      JButton first = new JButton("第一张");
30      JButton next = new JButton("下一张");
31      JButton previous = new JButton("上一张");
32      JButton last = new JButton("最后一张");
33      
34      public static void main(String[] args) {
35          new TestCardLayout();
36      }
37      
38      TestCardLayout() {
39         this.setTitle("TestCardLayout");
40         this.setSize(400, 300);
41         this.setLayout(new GridLayout(1, 2));
42         main.setLayout(new CardLayout());
43         this.setResizable(false);
44         
45         nav.setLayout(new GridLayout(4,1));
46         jp1.add(first);
47         jp2.add(next);
48         jp3.add(previous);
49         jp4.add(last);
50         nav.add(jp1);
51         nav.add(jp2);
52         nav.add(jp3);
53         nav.add(jp4);
54         jpFirst.add(jl1);
55         jpNext.add(jl2);
56         jpPrevious.add(jl3);
57         jpLast.add(jl4);
58         main.add(jpFirst);
59         main.add(jpNext);
60         main.add(jpPrevious);
61         main.add(jpLast);
62         
63         this.add(nav);
64         this.add(main);
65         first.addActionListener(this);
66         next.addActionListener(this);
67         previous.addActionListener(this);
68         last.addActionListener(this);
69         this.addWindowListener(new WindowAdapter() {
70             public void windowClosing(WindowEvent arg0) {
71                 System.exit(0);
72             }            
73         });            
74         setVisible(true);    
75      }
76      
77     public void actionPerformed(ActionEvent e) {
78         cl = (CardLayout)main.getLayout();
79         cl.setHgap(0); cl.setVgap(0);
80         
81         if(e.getSource() == first){
82             cl.first(main);
83         }else if(e.getSource() == next){
84             cl.next(main);
85         }else if(e.getSource() == previous){
86             cl.previous(main);
87         }else if(e.getSource() == last){
88             cl.last(main);
89         }
90         
91         
92     }
93 
94 }

 

效果图：

【例2】代码：

  1 import java.awt.BorderLayout;
  2 import java.awt.CardLayout;
  3 import java.awt.Color;
  4 import java.awt.Dimension;
  5 import java.awt.Font;
  6 import java.awt.Graphics;
  7 import java.awt.GridLayout;
  8 import java.awt.Image;
  9 import java.awt.Label;
 10 import java.awt.event.ActionEvent;
 11 import java.awt.event.ActionListener;
 12 import java.awt.event.WindowAdapter;
 13 import java.awt.event.WindowEvent;
 14 
 15 import javax.swing.BorderFactory;
 16 import javax.swing.ImageIcon;
 17 import javax.swing.JFrame;
 18 import javax.swing.JLabel;
 19 import javax.swing.JMenu;
 20 import javax.swing.JMenuBar;
 21 import javax.swing.JMenuItem;
 22 import javax.swing.JPanel;
 23 
 24 public class UserMain extends JFrame implements ActionListener {
 25     private String name;
 26     public void setName(String name) {
 27         this.name = name;
 28     }
 29 
 30     public String getName() {
 31         return name;
 32     }
 33 
 34     private CardLayout cl;
 35     
 36     public CardLayout getCl() {
 37         return cl;
 38     }
 39     
 40     //所用面板
 41     private JPanel main = new JPanel();
 42     public JPanel getMain() {
 43         return main;
 44     }
 45     JPanel barPanel = new JPanel();
 46     JPanel userPanel = new JPanel();
 47     JPanel jpDefault = new JPanel();
 48     JPanel eastPanel = new JPanel();
 49     JPanel southPanel = new JPanel();
 50     JPanel jp1,jp2,jp3,jp4,jp5,jp6,jp7;
 51     
 52     //所用菜单组件
 53     JMenuBar mBar = new JMenuBar();    
 54     JMenu myOrder = new JMenu("我的订单");
 55     JMenuItem oQuery = new JMenuItem("订单查询");
 56     JMenuItem oAdd = new JMenuItem("添加订单");
 57     JMenuItem oDel = new JMenuItem("取消订单");
 58     JMenu uInfo = new JMenu("我的信息");
 59     JMenuItem uQuery = new JMenuItem("查询");
 60     JMenuItem uModify = new JMenuItem("修改");
 61     JMenu hInfo = new JMenu("酒店信息");
 62     JMenuItem hQuery = new JMenuItem("查询");
 63     JMenu option = new JMenu("选择");
 64     JMenuItem help = new JMenuItem("帮助");
 65     JMenuItem back = new JMenuItem("注销");
 66     
 67     public static void main(String[] args) {
 68         new UserMain("KK");
 69     }
 70     
 71     UserMain(String name) {
 72         this.name = name;
 73         
 74         this.setTitle(name +"用户，欢迎您!");
 75         this.setLayout(new BorderLayout());
 76         this.setResizable(false);
 77         
 78         //放置背景图片
 79         ImageIcon background = new ImageIcon(LoginFrame.class.getClassLoader().getResource("images/Umain.jpg"));
 80         JLabel bkLabel = new JLabel(background);
 81         bkLabel.setBounds(0, 0,background.getIconWidth(), background.getIconHeight());
 82         this.setSize(background.getIconWidth(), background.getIconHeight());
 83         this.getLayeredPane().add(bkLabel,new Integer(Integer.MIN_VALUE));
 84         JPanel ctPanel = (JPanel)this.getContentPane();
 85         ctPanel.setOpaque(false);
 86         
 87         //设置面板透明度，布局，和菜单组合
 88         main.setOpaque(false);
 89         jpDefault.setOpaque(false);
 90         barPanel.setOpaque(false);
 91         userPanel.setOpaque(false);
 92         eastPanel.setOpaque(false);
 93         southPanel.setOpaque(false);
 94         main.setLayout(new CardLayout());
 95         barPanel.setLayout(new BorderLayout());
 96         //main.setBackground(new Color(255, 250 ,250));
 97         uInfo.add(uQuery);
 98         uInfo.add(uModify);
 99         hInfo.add(hQuery);
100         myOrder.add(oQuery);
101         myOrder.add(oAdd);
102         myOrder.add(oDel);
103         option.add(help);
104         option.add(back);
105         mBar.add(uInfo);
106         mBar.add(hInfo);
107         mBar.add(myOrder);
108         mBar.add(option);
109         mBar.setOpaque(false);
110         barPanel.add(mBar,BorderLayout.EAST);
111         
112         //设置标签样式，面板大小等
113         uInfo.setForeground(Color.WHITE);
114         hInfo.setForeground(Color.WHITE);
115         myOrder.setForeground(Color.WHITE);    
116         option.setForeground(Color.WHITE);    
117         myOrder.setFont(new  java.awt.Font("微软楷体", Font.BOLD,  18));
118         uInfo.setFont(new  java.awt.Font("微软楷体", Font.BOLD,  18));
119         hInfo.setFont(new  java.awt.Font("微软楷体", Font.BOLD,  18));
120         option.setFont(new  java.awt.Font("微软楷体", Font.BOLD,  18));
121         myOrder.setPreferredSize(new Dimension(120,20));
122         uInfo.setPreferredSize(new Dimension(150,20));
123         hInfo.setPreferredSize(new Dimension(150,20));
124         option.setPreferredSize(new Dimension(80,20));
125         barPanel.setPreferredSize(new Dimension(940,158));
126         userPanel.setPreferredSize(new Dimension(380,400));
127         eastPanel.setPreferredSize(new Dimension(60,400));
128         southPanel.setPreferredSize(new Dimension(940,50));
129         mBar.setBorder(BorderFactory.createEmptyBorder());
130         
131 
132         main.add(jpDefault);
133         this.add(barPanel,BorderLayout.NORTH);
134         this.add(userPanel,BorderLayout.WEST);
135         this.add(main,BorderLayout.CENTER);
136         this.add(eastPanel,BorderLayout.EAST);
137         this.add(southPanel,BorderLayout.SOUTH);
138         this.pack();
139         
140         oQuery.addActionListener(this);
141         oAdd.addActionListener(this);
142         oDel.addActionListener(this);
143         uQuery.addActionListener(this);
144         uModify.addActionListener(this);
145         hQuery.addActionListener(this);    
146         help.addActionListener(this);
147         back.addActionListener(this);    
148         this.addWindowListener(new WindowAdapter() {
149             public void windowClosing(WindowEvent arg0) {
150                 System.exit(0);
151             }            
152         });            
153         setVisible(true);            
154     }
155     
156     public void actionPerformed(ActionEvent e) {
157         cl = (CardLayout)main.getLayout();
158         cl.setHgap(0); cl.setVgap(0);
159         
160         if(e.getSource() == uQuery){
161             jp1 = (JPanel)new UserCard("用户查询",this);            
162             main.add("用户查询",jp1);
163             cl.show(main,"用户查询");
164             }else if(e.getSource() == uModify){
165                 jp2 = (JPanel)new UserCard("用户修改",this);            
166                 main.add("用户修改",jp2);
167                 cl.show(main,"用户修改");
168             }else if(e.getSource() == hQuery) {
169                 jp3 = (JPanel)new UserCard("酒店查询",this);            
170                 main.add("酒店查询",jp3);
171                 cl.show(main,"酒店查询");
172             }else if(e.getSource() == oQuery) {
173                 jp4 = (JPanel)new UserCard("订单查询",this);
174                 main.add("订单查询",jp4);
175                 cl.show(main, "订单查询");
176             }else if(e.getSource() == oAdd) {
177                 jp5 = (JPanel)new UserCard("订单添加",this);            
178                 main.add("订单添加",jp5);
179                 cl.show(main, "订单添加");
180             }else if(e.getSource() == oDel) {
181                 jp6 = (JPanel)new UserCard("订单删除",this);            
182                 main.add("订单删除",jp6);
183                 cl.show(main, "订单删除");
184             }else if (e.getSource() == help) {
185             System.out.println("hhhh");
186                 jp7 = (JPanel)new UserCard("帮助",this);            
187                 main.add("帮助",jp7);
188                 cl.show(main,"帮助");
189             }else if (e.getSource() == back) {
190                 this.setVisible(false);
191                 new LoginFrame();
192             }
193                 
194     }
195 
196 }

 

 

通过show()方法显示指定“卡片”，不同”卡片”指向继承JPanel的不同类。

效果图：

因为是Java初学者，窗体的很多布局不是很了解，为了让窗体看上去好看，只有硬塞一张处理过的图片了，嘿嘿--