import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*; public class test extends JFrame{ static int count=0,all=0,but; static String fuhao; private JLabel promptLabel; private JTextField inputField; private JTextArea outputArea; private JButton j0,j1,j2,j3,j4,j5,j6,j7,j8,j9,x1,x2,y1,y2,s1,s2; private int jiahao=0; static int paixu[]=new int[50];        public test(){   super("ceshi StringTokenizer");   Container container=getContentPane();   container.setLayout(new FlowLayout());      promptLabel=new JLabel("计算器");   container.add(promptLabel);   inputField=new JTextField(20);               inputField.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     StringTokenizer tokens=new StringTokenizer(event.getActionCommand());          outputArea.setText("Number of elements"+tokens.countTokens()+"\nThe tokens are:\n");          while(tokens.hasMoreTokens())     outputArea.append(tokens.nextToken()+"\n");    }   });      container.add(inputField);      j1=new JButton("1");   j2=new JButton("2");   j3=new JButton("3");      x1=new JButton("*");   x2=new JButton("/");      j4=new JButton("4");   j5=new JButton("5");   j6=new JButton("6");      y1=new JButton("+");   y2=new JButton("-");   j7=new JButton("7");   j8=new JButton("8");   j9=new JButton("9");   s1=new JButton("=");   j0=new JButton("0"); //1--------------     j1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){          but=1;count++;     paixu(1);          inputField.setText("\t\t            1\n");                 }   }); //2--------------     j2.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(2);      inputField.setText("\t\t            2\n");   }   }   ); //3--------------     j3.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(3);      inputField.setText("\t\t            3\n");   }   }   );//4-----------      j4.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(4);      inputField.setText("\t\t            4\n");   }   }   ); //5-------------- j5.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(5);      inputField.setText("\t\t            5\n");   }   }   );      //6---------------------   j6.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(6);      inputField.setText("\t\t            6\n");   }   }   );      //7----------------------   j7.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(7);      inputField.setText("\t\t            7\n");   }   }   );      //8------------   j8.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(8);      inputField.setText("\t\t            8\n");   }   }   );      //9-------------------   j9.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(9);      inputField.setText("\t\t            9\n");   }   }   );      //0-----------------------   j0.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;count++;     paixu(0);      inputField.setText("\t\t            0\n");   }   }   );    //+-----------     y1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){      fuhao="+";             }   });//- ---------------      y2.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){      fuhao="-";             }   });   // *---------------      x1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){      fuhao="*";             }   });   // / ---------------      x2.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){      fuhao="/";             }   });      //= --------------------      s1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){         if(fuhao=="+")//+  {   all=paixu[1]+paixu[2];      String All="\t\t         ";      All+=all;     inputField.setText(All);     }             else    if(fuhao=="-")//-  {   all=paixu[1]-paixu[2];      String All="\t\t         ";      All+=all;     inputField.setText(All);     }    else   if(fuhao=="*")//*  {   all=paixu[1]*paixu[2];      String All="\t\t         ";      All+=all;     inputField.setText(All);     }      else   if(fuhao=="/")// /  {   all=paixu[1]/paixu[2];      String All="\t\t         ";      All+=all;     inputField.setText(All);     }        count=0;      }   });      container.add(j9);   container.add(j8);   container.add(j7);      container.add(x1);   container.add(x2);      container.add(j6);   container.add(j5);   container.add(j4);      container.add(y1);   container.add(y2);      container.add(j3);   container.add(j2);   container.add(j1);   container.add(j0);      container.add(s1);               outputArea=new JTextArea(10,18);   outputArea.setEditable(false);      container.add(new JScrollPane(outputArea));            setSize(275,500);   setVisible(true);     }    //堆栈-------------------------  private void paixu(int button){      paixu[count]=button;     }    public static void main(String args[]){   test application=new test();   application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }}    

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