jisuanji.java

使用java语言编写的功能比较强大的计算机。压缩包中有3个不同的版本

import java.awt.*;
import java.awt.event.*;

public class jisuanji implements ActionListener,WindowListener{
	Frame f;
	TextField msg;
	Panel pan;
	Button buttons[];
	Button button_Add,button_Del,button_Mul,button_Div,button_Equ,button_C;
	float Left,Right,Result;
	int type;
	int temp;

public void actionPerformed(ActionEvent e)
  {
	for(int i=0;i<buttons.length;i++){
		if(e.getSource()==buttons[i]){
			msg.setText(msg.getText()+Integer.toString(i));
			}
		}
	if(e.getSource()==button_Add){
		Left=Float.parseFloat(msg.getText());
		msg.setText("");
		type=1;
		}
	if(e.getSource()==button_Del){
		Left=Float.parseFloat(msg.getText());
		msg.setText("");
		type=2;
		}
	if(e.getSource()==button_Mul){
		Left=Float.parseFloat(msg.getText());
		msg.setText("");
		type=3;
		}
	if(e.getSource()==button_Div){
		Left=Float.parseFloat(msg.getText());
		msg.setText("");
		type=4;
		}
	if(e.getSource()==button_C)
		msg.setText("");
	if(e.getSource()==button_Equ){
		switch(type)
		{
			case 1: Right=Float.parseFloat(msg.getText());
			Result=Left+Right;
			temp=(int)Result;
			if((float)temp==Result)
				msg.setText(Integer.toString(temp));
			else
				msg.setText(Float.toString(Result));
			break;
			case 2: Right=Float.parseFloat(msg.getText());
			Result=Left-Right;
			temp=(int)Result;
			if((float)temp==Result)
				msg.setText(Integer.toString(temp));
			else
				msg.setText(Float.toString(Result));
			break;
			case 3: Right=Float.parseFloat(msg.getText());
			Result=Left*Right;
			temp=(int)Result;
			if((float)temp==Result)
				msg.setText(Integer.toString(temp));
			else
				msg.setText(Float.toString(Result));
			break;
			case 4: Right=Float.parseFloat(msg.getText());
			Result=Left/Right;
			temp=(int)Result;
			if((float)temp==Result)
				msg.setText(Integer.toString(temp));
			else
				msg.setText(Float.toString(Result));
			break;
			}
		}
  }
  public jisuanji()
  {
	f=new Frame("计算器");
	msg=new TextField(20);
	pan=new Panel();
	buttons=new Button[10];
	button_Add=new Button("+");
	button_Del=new Button("-");	
	button_Mul=new Button("*");
	button_Div=new Button("/");
	button_Equ=new Button("=");
	button_C=new Button("CE");
	for(int i=0;i<buttons.length;i++){
		buttons[i]=new Button(""+i);
		}
	pan.setLayout(new GridLayout(4,4));
	pan.add(buttons[1]);
	pan.add(buttons[2]);
	pan.add(buttons[3]);
	pan.add(button_Add);
	pan.add(buttons[4]);
	pan.add(buttons[5]);
	pan.add(buttons[6]);
	pan.add(button_Del);
	pan.add(buttons[7]);
	pan.add(buttons[8]);
	pan.add(buttons[9]);
	pan.add(button_Mul);
	pan.add(buttons[0]);
	pan.add(button_Div);
	pan.add(button_Equ);
	pan.add(button_C);
	f.add(msg,BorderLayout.NORTH);
	f.add(pan,BorderLayout.CENTER);	
	for(int i=0;i<10;i++)
		buttons[i].addActionListener(this);
	button_Add.addActionListener(this);
	button_Del.addActionListener(this);
	button_Mul.addActionListener(this);
	button_Div.addActionListener(this);
	button_Equ.addActionListener(this);
	button_C.addActionListener(this);
	f.addWindowListener(this);
	f.setSize(150,240);
	f.setVisible(true);
 }
public void windowClosing(WindowEvent e){System.exit(0);}
public void windowOpened(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}

public static void main(String args[])
{
new jisuanji();
	}
}