import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*; public class test extends JFrame{ static int count=0; 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 all=0,jiahao=0,j11,j22;       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");      j1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){          j11=1;     inputField.setText("\t\t            1\n");     count=1;              }   });      j2.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     j22=2;     if(count==2)     all+=j22;                   }   });         y1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     if(count==1)    { all=j11;     count=2;}     else     inputField.setText("\t\t            1\n");              }   });      s1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     String All="";     All+=all;     inputField.setText(All);                   }   });      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(10,20);   outputArea.setEditable(false);      container.add(new JScrollPane(outputArea));            setSize(275,500);   setVisible(true);     }    public static void main(String args[]){   test application=new test();   application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }} //------------------------------------------------------------------------------------------ import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*; public class test extends JFrame{ static int 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;       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");      j1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){          but=1;          inputField.setText("\t\t            1\n");                 }   });      j2.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     but=2;      inputField.setText("\t\t            2\n");   }   }   );         y1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){    if(but==1)   {  all+=1;    fuhao="+";}                   }   });      s1.addActionListener(new ActionListener(){    public void actionPerformed(ActionEvent event){     if((fuhao=="+")&&(but==2))  {   all+=but;      String All="\t\t       ";     All+=all;     inputField.setText(All);     }        }   });      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);     }    public static void main(String args[]){   test application=new test();   application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }}  

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