caculator.java

我自己用Java写的仿windows计算器程序 功能为普通型

package myCculator;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class Caculator extends JFrame{

	
	double InputTemp,Input2;
	double Output;
	Stack Input;
	static double memory=0.0;
	static boolean decimalPressed=false;
	static int operatorPressed=0;
	static boolean signValue=true;
	static boolean ErrorOccured=false;
	static boolean BKSPLock=false;
	
	final JTextField IOtext;
	final JTextField memoryStatus;
	final JButton BKSP;
	final JButton CE;
	final JButton C;
	final JButton memoryClear;
	final JButton Num[];
	final JButton operator[];
	final JButton sqrt;
	final JButton memoryRecall;
	final JButton percent;
	final JButton memorySet;
	final JButton reciprocal;
	final JButton memoryPlus;
	final JButton sign;
	final JButton decimal;
	final JButton equal;	
	
	public static void main(String args[]) {
		try {
			Caculator frame = new Caculator();
			frame.setVisible(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public Caculator() {			
		super("");
		setResizable(false);
		getContentPane().setLayout(null);
		setBounds(100, 100, 430, 235);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		Input=new Stack();

		IOtext = new JTextField();
		IOtext.setFocusable(false);
		IOtext.setDisabledTextColor(Color.BLACK);
		IOtext.setAutoscrolls(false);
		IOtext.setComponentOrientation
		               (ComponentOrientation.RIGHT_TO_LEFT);
		IOtext.setText(".0");
		IOtext.setColumns(35);
		IOtext.setBounds(10, 10, 400, 21);
		getContentPane().add(IOtext);
		
		memoryStatus = new JTextField();
		memoryStatus.setEditable(false);
		memoryStatus.setBounds(10, 37, 25, 21);
		getContentPane().add(memoryStatus);

		BKSP = new JButton();
		BKSP.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false&&BKSPLock==false){
					if(IOtext.getText().equals(".0")==false
							&&IOtext.getText().length()>2
							&&IOtext.getText().length()!=2&&
							IOtext.getText().charAt
							        (IOtext.getText().length()-2)!='.'){
						IOtext.setText(IOtext.getText().substring(0, 
								            IOtext.getText().length()-1));
					}
					else if(IOtext.getText().length()>2&&
							IOtext.getText().charAt
							         (IOtext.getText().length()-2)=='.'){
						IOtext.setText("."+IOtext.getText().substring(0, 
								            IOtext.getText().length()-2));
						decimalPressed=false;
					}
					else{
						IOtext.setText(".0");
						decimalPressed=false;
					}
				}
			}
		});
		BKSP.setText("Backspace");
		BKSP.setBounds(93, 37, 101, 25);
		getContentPane().add(BKSP);

		CE = new JButton();
		CE.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
					IOtext.setText(".0");		
					decimalPressed=false;
					operatorPressed=0;
					signValue=true;
					ErrorOccured=false;
					BKSPLock=false;
			}
		});
		CE.setText("  CE  ");
		CE.setBounds(200, 37, 101, 25);
		getContentPane().add(CE);

		C = new JButton();
		C.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
					IOtext.setText(".0");
					decimalPressed=false;
					operatorPressed=0;
					signValue=true;
					ErrorOccured=false;
					BKSPLock=false;
			}
		});
		C.setText("C");
		C.setBounds(307, 37, 101, 25);
		getContentPane().add(C);

		memoryClear = new JButton();
		memoryClear.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				if(ErrorOccured==false){
					memory=0;
					memoryStatus.setText("");
				}
			}
		});
		memoryClear.setText("MC");
		memoryClear.setBounds(10, 81, 53, 25);
		getContentPane().add(memoryClear);
		
		Num=new JButton[10];
		for(int i=0;i<10;i++){
			Num[i]=new JButton(Integer.toString(i));			
			Num[i].addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					if(ErrorOccured==false){
						if(e.getSource()==Num[0]
							&&IOtext.getText().equals(".0")
							 &&decimalPressed==false){}
						else for(int i=0;i<10;i++){
								if(e.getSource()==Num[i]
								    &&IOtext.getText().length()<33){
								if((IOtext.getText().equals(".0")||
									BKSPLock)&&decimalPressed==false){
									IOtext.setText("."+Integer.toString(i));
									BKSPLock=false;
									if(Input.empty()){
										operatorPressed=0;
									}
								}
								else if(decimalPressed
								         &&IOtext.getText().charAt(0)=='.'){
									IOtext.setText(IOtext.getText().substring(1)
									+"."+Integer.toString(i));
									}
								else {
								   IOtext.setText(IOtext.getText()
								                        +Integer.toString(i));
								}
							}
						}
					}
				}
			});
		}
		Num[7].setBounds(93, 81, 53, 25);
		Num[8].setBounds(152, 81, 53, 25);
		Num[9].setBounds(211, 81, 53, 25);
		Num[4].setBounds(93, 112, 53, 25);
		Num[5].setBounds(152, 112, 53, 25);
		Num[6].setBounds(211, 112, 53, 25);
		Num[1].setBounds(93, 143, 53, 25);
		Num[2].setBounds(152, 143, 53, 25);
		Num[3].setBounds(211, 143, 53, 25);
		Num[0].setBounds(93, 174, 53, 25);
		for(int i=0;i<10;i++){
			getContentPane().add(Num[i]);
		}

		operator = new JButton[4];
		for(int i=0;i<4;i++){
			operator[i]=new JButton();
			operator[i].addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					if(ErrorOccured==false){
						for(int i=0;i<4;i++){
							if(e.getSource()==operator[i]){
								if(Input.empty()){}
								else if(BKSPLock==false){
									InputTemp=((Double)
									          (Input.pop())).doubleValue();
									compute(InputTemp,
									            toDouble(IOtext.getText()));
								}								
								Input.push(new Double
								            (toDouble(IOtext.getText())));
								operatorPressed=i+1;
							}
						}
						decimalPressed=false;
						signValue=true;
						BKSPLock=true;
					}
				}
			});
		}
		operator[0].setText("/");
		operator[1].setText("");
		operator[2].setText("");
		operator[3].setText("+");
		operator[0].setBounds(270, 81, 54, 25);
		operator[1].setBounds(270, 112, 54, 25);
		operator[2].setBounds(270, 143, 54, 25);
		operator[3].setBounds(270, 174, 54, 25);
		for(int i=0;i<4;i++){
			getContentPane().add(operator[i]);
		}
		
		equal = new JButton();
		equal.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					if(Input.empty()==false){
						InputTemp=((Double)(Input.pop())).doubleValue();
						Input2=toDouble(IOtext.getText());
					}
					else if(BKSPLock&&operatorPressed!=0){
						InputTemp=toDouble(IOtext.getText());				
					}
					compute(InputTemp,Input2);
					decimalPressed=false;
					BKSPLock=true;					
				}
			}
		});
		equal.setText("=");
		equal.setBounds(339, 174, 71, 25);
		getContentPane().add(equal);

		sqrt = new JButton();
		sqrt.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					if(toDouble(IOtext.getText())<0){
						IOtext.setText("效");
						ErrorOccured=true;
					}
					else {
						resultOutput(Double.toString
						          (Math.sqrt(toDouble(IOtext.getText()))));
					}
					if(BKSPLock){
						operatorPressed=0;
					}
					decimalPressed=false;
					BKSPLock=true;
				}
			}
		});
		sqrt.setText("sqrt");
		sqrt.setBounds(339, 81, 71, 25);
		getContentPane().add(sqrt);

		memoryRecall = new JButton();
		memoryRecall.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					resultOutput(Double.toString(memory));
					decimalPressed=false;
					if(memory<0)signValue=false;
					else signValue=true;
				}
			}
		});
		memoryRecall.setText("MR");
		memoryRecall.setBounds(10, 112, 53, 25);
		getContentPane().add(memoryRecall);

		percent = new JButton();
		percent.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
			}
		});
		percent.setText("%");
		percent.setBounds(339, 112, 71, 25);
		getContentPane().add(percent);

		memorySet = new JButton();
		memorySet.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					if(IOtext.getText().equals(".0")==false){
						memory=toDouble(IOtext.getText());
						memoryStatus.setText("  M");
					}
					else {
						memory=0;
						memoryStatus.setText("");
					}
				}
			}
		});
		memorySet.setText("MS");
		memorySet.setBounds(10, 143, 53, 25);
		getContentPane().add(memorySet);

		reciprocal = new JButton();
		reciprocal.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {				
				if(ErrorOccured==false){
					if(IOtext.getText().equals(".0")){
							IOtext.setText("为");
							ErrorOccured=true;
						}
						else {
							resultOutput(Double.toString(
									    1/toDouble(IOtext.getText())));
							BKSPLock=true;
							decimalPressed=false;
						}
				}
			}
		});
		reciprocal.setText("1/x");
		reciprocal.setBounds(339, 143, 71, 25);
		getContentPane().add(reciprocal);

		memoryPlus = new JButton();
		memoryPlus.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					memory+=toDouble(IOtext.getText());
					if(memory==0){
						memoryStatus.setText("");
					}
					else memoryStatus.setText("  M");
				}
			}
		});
		memoryPlus.setText("M+");
		memoryPlus.setBounds(10, 174, 53, 25);
		getContentPane().add(memoryPlus);

		sign = new JButton();
		sign.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(IOtext.getText().equals(".0")==false&&
						      ErrorOccured==false){
					if(signValue){
						if(IOtext.getText().charAt(0)!='.'){
							IOtext.setText("-"+IOtext.getText());
						}
						else{
							IOtext.setText(".-"+IOtext.getText().substring(1));
						}
						signValue=false;
					}
					else {
						if(IOtext.getText().charAt(0)!='.'){
							IOtext.setText(IOtext.getText().substring(1));
						}
						else{
							IOtext.setText("."+IOtext.getText().substring(2));
						}
						signValue=true;
					}
				}
			}
		});
		sign.setText("+/-");
		sign.setBounds(152, 174, 53, 25);
		getContentPane().add(sign);

		decimal = new JButton();
		decimal.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(ErrorOccured==false){
					if(decimalPressed==false){
						if(BKSPLock==true){
							IOtext.setText(".0");
							signValue=true;
							BKSPLock=false;
						}
						decimalPressed=true;
					}
				}
			}
		});
		decimal.setText(".");
		decimal.setBounds(211, 174, 53, 25);
		getContentPane().add(decimal);

	}
	
	public double toDouble(String s){
		if(s.charAt(0)=='.'){
			return Double.parseDouble(s.substring(1));
		}
		else return Double.parseDouble(s);
	}
	
	public void resultOutput(String s){
		while(s.charAt(s.length()-1)=='0'){
			if(s.charAt(s.length()-2)=='.'){
			IOtext.setText("."+s.substring(0,s.length()-2));
			return;
			}
			else s=s.substring(0,s.length()-1);
		}
		IOtext.setText(s);
	}
	
	public void compute(double a,double b){
		switch(operatorPressed){
		case 1:if(b!=0){
			 resultOutput(Double.toString(a/b));
		    }
		else{
			IOtext.setText("为");
			ErrorOccured=true;
		     }
			break;
		case 2:resultOutput(Double.toString(a*b));break;
		case 3:resultOutput(Double.toString(a-b));break;
		case 4:resultOutput(Double.toString(a+b));break;
		}
	}

}