java程序计算器简略的能算加减乘除就行

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  package time;
  import java.applet.*;
  import java.awt.*;
  import java.awt.Event.*;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  public class TestInnerClass extends Applet{
  TextField text1,text2,text3;
  Button button1,button2;
  CheckboxGroup select;
  Checkbox a,s,m,d;
  public void init()
  {
  text1=new TextField(10);
  text2=new TextField(10);
  text3=new TextField(10);
  button1=new Button("计算");
  button2=new Button("重置");
  select=new CheckboxGroup();
  a=new Checkbox("加",true,select);
  s=new Checkbox("减",true,select);
  m=new Checkbox("乘",true,select);
  d=new Checkbox("除",true,select);
  add(a);add(m);add(s);add(d);
  add(text1);add(text2);add(text3);
  add(button1);add(button2);
  text1.addActionListener(new TextAct());
  text2.addActionListener(new TextAct());
  button1.addActionListener(new ButtonAct());
  button2.addActionListener(new ButtonAct());
  }
  class TextAct implements ActionListener{
  public void actionPerformed(ActionEvent e)
  {
  TextField text;
  int operand;
  text=(TextField)(e.getSource());
  operand=Integer.parseInt(text.getText());
  if(operand<0|operand>100)
  text.setText("输入整据越界");
  }
  }
  class ButtonAct implements ActionListener
  {
  public void actionPerformed(ActionEvent e)
  {
  int op1,op2,op3;
  if(e.getSource()==button1)
  {
  op1=Integer.parseInt(text1.getText());
  op2=Integer.parseInt(text2.getText());
  if(a.getState())
  op3=op1+op2;
  else if(s.getState())
  op3=op1-op2;
  else if(m.getState())
  op3=op1*op2;
  else
  op3=op1/op2;
  text3.setText(Integer.toString(op3));
  }
  else
  {
  text1.setText("");
  text2.setText("");
  text3.setText("");
  a.setState(true);
  }
  }
  }}

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