calcv1_0.java

使用java实现的计算器功能,能够实现加,减,乘,除功能.

import java.awt.*; 
import java.awt.event.*; 
public class CalcV1_0 implements ActionListener 
{ 
   Frame win=new Frame("CalcV1_0"); 
   Panel num=new Panel(); 
   Panel meth=new Panel(); 
   TextArea display=new TextArea(); 
   Button add1,sub,mul,div; 
   int no1,no2; 
   float no3; 
   String ch,ch3; 
   Button res=new Button("="); 
   Button canc=new Button("CE"); 
   Button but7=new Button("7"); 
   Button but8=new Button("8"); 
   Button but9=new Button("9"); 
   Button but4=new Button("4"); 
   Button but5=new Button("5"); 
   Button but6=new Button("6"); 
   Button but1=new Button("1"); 
   Button but2=new Button("2"); 
   Button but3=new Button("3"); 
   Button but0=new Button("0"); 
public void test() 
{ 
  add1=new Button("+"); 
  sub=new Button("-"); 
  mul=new Button("*"); 
  div=new Button("/"); 
  win.setLayout(new GridLayout(4,0)); 
  num.setLayout(new GridLayout(4,3)); 
  meth.setLayout(new GridLayout(0,4)); 
  num.add(but7); 
  num.add(but8); 
  num.add(but9); 
  num.add(but4); 
  num.add(but5); 
  num.add(but6); 
  num.add(but1); 
  num.add(but2); 
  num.add(but3); 
  num.add(but0); 
  num.add(canc); 
  num.add(res); 
  but0.addActionListener(this); 
  but1.addActionListener(this); 
  but2.addActionListener(this); 
  but3.addActionListener(this); 
  but4.addActionListener(this); 
  but5.addActionListener(this); 
  but6.addActionListener(this); 
  but7.addActionListener(this); 
  but8.addActionListener(this); 
  but9.addActionListener(this); 
  canc.addActionListener(new CE()); 
  add1.addActionListener(new METH()); 
  sub.addActionListener(new METH()); 
  mul.addActionListener(new METH()); 
  div.addActionListener(new METH()); 
  res.addActionListener(new RES()); 
  add1.setSize(10, 10); 
  meth.add(add1); 
  meth.add(sub); 
  meth.add(mul); 
  meth.add(div); 
  win.add(display); 
  win.add(num); 
  win.add(meth); 
  win.setSize(400,400); 
  win.setVisible(true); 
  win.addWindowListener(new WindowAdapter()
{ 
  public void windowClosing(WindowEvent e){ 
  System.exit(0); 
  } 
}); 
} 
public void actionPerformed(ActionEvent e){ 
display.append(e.getActionCommand()); 
} 
private class CE implements ActionListener{ 
public void actionPerformed(ActionEvent ex){ 
display.setText(""); 
no1=0; 
no2=0; 
no3=0; 
} 
} 
private class METH implements ActionListener{ 
public void actionPerformed(ActionEvent ey){ 
no1=Integer.parseInt(display.getText()); 
display.setText(""); 
ch=ey.getActionCommand(); 
} 
} 
private class RES implements ActionListener{ 
public void actionPerformed(ActionEvent es){ 
no2=Integer.parseInt(display.getText()); 
if(ch=="+") 
{no3=no1+no2; 
ch3=Float.toString(no3); 
display.setText(ch3); 
} 
else if(ch=="-") 
{no3=no1-no2; 
ch3=Float.toString(no3); 
display.setText(ch3); 
} 
else if(ch=="*") 
{no3=no1*no2; 
ch3=Float.toString(no3); 
display.setText(ch3); 
} 
else if(ch=="/") 
{no3=(float)no1/no2; 
ch3=Float.toString(no3); 
display.setText(ch3); 
} 
} 
} 
public static void main (String[]args){ 
CalcV1_0 s=new CalcV1_0(); 
s.test(); 
} 
}