java的栈图形演示

 import java.awt.*;
 import javax.swing.*;
 import java.awt.event.*;
 /*
 指示发生了组件定义的动作的语义事件。当特定于组件的动作（比如被按下）发生时，由组件（比如 Button）生成此高级别事件。
 事件被传递给每一个 ActionListener 对象，这些对象是使用组件的 addActionListener 方法注册的，用以接收这类事件。
 所以在给TextField类添加 ActionListener 类型的监听器时就会失败！

 ****下面还有XXXListener和XXXAdapter的用法，相信你会喜欢上XXXAdapter的用法
 */
 public class stackDemo extends MouseAdapter{
    JFrame fr=new JFrame("StackDemo");//对话框
    JPanel pan= new JPanel();//菜单面板
    JPanel panStack = new JPanel();
    JButton pushBtn, popBtn, peekBtn;
    JTextField tf= new JTextField("整数", 4);
    JButton stackBtn[]= new JButton[10];

    JPanel panStackPointerLabel= new JPanel();
    JLabel stackPointerLabel = new JLabel("<-top");

    JPanel panRet= new JPanel();
    JTextField tfRet= new JTextField("操作结果！");

    int top;

    public stackDemo(){
       fr.setSize(420,500);
       fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       fr.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));

       pan.setPreferredSize(new Dimension(400, 50));
       pan.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));
       panStack.setPreferredSize(new Dimension(80, 350));//设置栈面板大小
       panStack.setBackground(Color.yellow);
       pan.setBackground(Color.blue);
       pan.add(new JLabel("操作菜单:"));
       pan.add(pushBtn=new JButton("进栈"));
       pushBtn.addMouseListener(new pushAction());
       pan.add(popBtn=new JButton("出栈"));
       popBtn.addMouseListener(new popAction());
       pan.add(peekBtn=new JButton("栈顶元素"));

       tf.addMouseListener(this);
       pan.add(tf);

       for(int i=0; i<10; ++i){
          stackBtn[i]=new JButton("   ");
          panStack.add(stackBtn[i]);
       }
       fr.add(pan);
       fr.add(panStack);
       panStackPointerLabel.setLayout(null);
       panStackPointerLabel.setPreferredSize(new Dimension(80, 350));//设置指针面板的大小
       panStackPointerLabel.setBackground(Color.LIGHT_GRAY);
       stackPointerLabel.setFont(new Font("华文行楷", Font.BOLD, 20));
       panStackPointerLabel.add(stackPointerLabel);

       fr.add(panStackPointerLabel);
       panRet.setLayout(new FlowLayout(FlowLayout.LEFT));
       panRet.setBackground(Color.red);
       panRet.setPreferredSize(new Dimension(400, 50));

       tfRet.setEditable(false);//不能不编辑
       panRet.add(tfRet);//操作结果面板
       fr.add(panRet);
       fr.setVisible(true);
       stackPointerLabel.setBounds(0, stackBtn[9].getLocation().y, 50, 50);//设置栈顶指针位置
       top=9;
    }

    public void mouseClicked(MouseEvent e){
        tf.selectAll();//鼠标单击时选中全部文本
    }

    //push 按钮监听器
    class pushAction implements MouseListener{
        public void mouseClicked(MouseEvent e){
           String text;

           if((text=tf.getText())!="   "){
               for(int i=0; i<text.length(); ++i)
                  if(!Character.isDigit(text.charAt(i)))
                     return ;
           }
           if(top<0){
              tfRet.setText("栈顶溢出！");
              return ;
           }
           Point pt=stackBtn[top].getLocation();
           stackBtn[top].setText(text);
           tfRet.setText("进栈值" + text);
           stackPointerLabel.setBounds(0, pt.y, 50, 50);
           --top;
        }
       public void mouseDragged(MouseEvent e){}
       public void mouseEntered(MouseEvent e){}
       public void mouseExited(MouseEvent e){}
       public void mouseMoved(MouseEvent e){}
       public void mouseReleased(MouseEvent e){}
       public void mousePressed(MouseEvent e){}
    }

    //pop按钮监听器
    class popAction extends MouseAdapter{
        public void mouseClicked(MouseEvent e){
           String text;
           if(top>=9){
             tfRet.setText("栈底溢出！");
             return ;
           }
           ++top;
           Point pt=stackBtn[top].getLocation();
           text=stackBtn[top].getText();
           tfRet.setText("出栈值" + text);
           stackBtn[top].setText("   ");
           stackPointerLabel.setBounds(0, pt.y, 50, 50);
        }
    }

    public static void main(String args[]){
       stackDemo mySstackDemo = new stackDemo();
    }
 }