calcular.java

用Swing编写的计算器

import java.text.*;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class DivideByZeroException extends ArithmeticException
{

	public DivideByZeroException()
	{
		super("试图除以0");
	}
	public DivideByZeroException(String s)
	{
		super(s);
	}
}
public class Calcular extends JFrame implements ActionListener,Runnable
{
	private static final double PI=3.1415926d;
	private JTextField ResultField, TimeField;
	private String StringOne, StringOperator, StringTwo,StringResult;
	private JButton b[], ClearButton,getTimeButton;
	private String names[]={"7","8","9","/","PI","abs","4","5","6","*","xcy","tan","1","2","3","-","sqrt","cos","0",".","=","+","sin","x_1"};
	private String ListenerNames[]={"tan","sqrt","cos","sin","=","x_1","abs"};
	private String BinaryOperatorNames="+ - * / xcy";
	private String NoneListenerNames[]={"7","8","9","/","PI","4","5","6","*","xcy","1","2","3","-","0",".","+"};
	private JPanel FouctionPane ;
	private Container c;
	private Thread thread;
	private boolean TimeShowing;
	private int i;

	public void run()
	{
		while(true)
		{

			try{
				Thread.sleep(1000);
			}
			catch(InterruptedException e)
			{}
			topaint();

		}
	}

	public Calcular()
	{
		super("计算器");
		this.getTimeButton = new JButton("切换时间");
		FouctionPane=new JPanel();
		b=new JButton[names.length];
		for( i=0;i<names.length;++i)

		{
			b[i]=new JButton(names[i]);
			b[i].addActionListener(this);


		}
		FouctionPane.setLayout(new GridLayout(4,6));
		FouctionPane.setSize(380,300);
		for(int i=0;i<names.length;i++)
		{
			FouctionPane.add(b[i]);
		}
		ClearButton=new JButton("清除");
		ClearButton.addActionListener(this);
		TimeField=new JTextField(20);

		ResultField=new JTextField(30);

		c = getContentPane();
		c.setLayout(new FlowLayout());
		c.add(ResultField);
		c.add(TimeField);
		c.add(this.getTimeButton);
		c.add(ClearButton);
		c.add(FouctionPane);
		thread = new Thread(this);
		this.TimeShowing = false;
		this.getTimeButton.addActionListener(this);
		this.setSize(400,300);
		this.setResizable(false);
		setVisible(true);
	}

	public void actionPerformed(ActionEvent e)
	{

		if(e.getSource() == getTimeButton)
			if(!this.TimeShowing)
			{
				thread.start();
				this.TimeShowing = !this.TimeShowing;
			}
			for(int j=0;j<NoneListenerNames.length;++j)
			if(((JButton)(e.getSource())).getText()==NoneListenerNames[j])
			{
				if(NoneListenerNames[j]=="PI")
					ResultField.setText(ResultField.getText()+(double)PI);	
				else
					ResultField.setText(ResultField.getText()+NoneListenerNames[j]);
			}

		for(int k=0;k<ListenerNames.length;++k)
		{
			if(((JButton)(e.getSource())).getText()==ListenerNames[k])
			{
				if(((JButton)e.getSource()).getText().equals("=")==false)
				{
					StringOne=ResultField.getText();

					if(((JButton)e.getSource()).getText()=="tan")
					{
						String s=" ";
						try
						{
							s=myTan(StringOne);
						}
						catch(DivideByZeroException dvze)
						{
							JOptionPane.showMessageDialog(this,"90度没有正切值","非法输入",JOptionPane.ERROR_MESSAGE);
						}

						ResultField.setText(s);
					}
					else if(((JButton)e.getSource()).getText()=="sqrt")
					{

						String s=" ";
						try
						{
							s=mySqrt(StringOne);
						}
						catch(DivideByZeroException dvze)
						{
							JOptionPane.showMessageDialog(this,"负数不能开平方","非法输入",JOptionPane.ERROR_MESSAGE);
						}

						ResultField.setText(s);
					}    
					else if(((JButton)e.getSource()).getText()=="sin")
						ResultField.setText(formatResult(Math.sin(Double.parseDouble(StringOne)*PI/180)));
					else if(((JButton)e.getSource()).getText()=="cos")
						ResultField.setText(formatResult(Math.cos(Double.parseDouble(StringOne)*PI/180)));
					else if(((JButton)e.getSource()).getText()=="x_1")
						ResultField.setText(formatResult(1/(Double.parseDouble(StringOne))));
					else if(((JButton)e.getSource()).getText()=="abs")
						ResultField.setText(formatResult(-Double.parseDouble(StringOne))); 
				}
				else 
				{
					StringResult=ResultField.getText();
					textConvertThree(StringResult);
					if(StringOperator=="+")
						ResultField.setText(formatResult(Double.parseDouble(StringOne)+Double.parseDouble(StringTwo)));
					else if(StringOperator=="-")	
						ResultField.setText(formatResult(Double.parseDouble(StringOne)-Double.parseDouble(StringTwo)));
					else if(StringOperator=="*")
						ResultField.setText(formatResult(Double.parseDouble(StringOne)*Double.parseDouble(StringTwo)));
					else if(StringOperator=="/")	
					{
						String str=" ";
						try
						{
							double child=Double.parseDouble(StringOne);
							double mother=Double.parseDouble(StringTwo);
							str=quotient(child,mother);
						}
						catch(DivideByZeroException dbze)
						{
							JOptionPane.showMessageDialog(this,"除数不能为0","非法输入",JOptionPane.ERROR_MESSAGE);

						}
						ResultField.setText(str);
					}
					else if(StringOperator=="xcy")
						ResultField.setText(miYunSuan(Double.parseDouble(StringOne),Double.parseDouble(StringTwo)));
					StringOne=ResultField.getText();
				}

			}
		}
		if(e.getSource().equals(ClearButton))
		{
			ResultField.setText(" ");
			StringOne=" ";
			StringTwo=" ";
			StringOperator=" ";
		}

	}
	public String miYunSuan (double buttom ,double index)
	{
		return formatResult(Math.pow(buttom,index));
	}
	public String quotient (double child,double mother)
	{
		if(mother==0)
			throw new DivideByZeroException();
		return formatResult(child/mother);
	}
	public String formatResult(double one)
	{
		DecimalFormat doubleformat=new DecimalFormat("0.0000");
		return doubleformat.format(one);
	}
	public void textConvertThree(String s)
	{
		StringTokenizer str=new StringTokenizer(s,BinaryOperatorNames);
		StringOne=str.nextToken();
		StringTwo=str.nextToken();
		if(s.contains("+"))
			StringOperator="+";
		if(s.contains("-"))
			StringOperator="-";
		if(s.contains("*"))
			StringOperator="*";
		if(s.contains("/"))
			StringOperator="/";
		if(s.contains("xcy"))
			StringOperator="xcy";
	}
	public void topaint()
	{
		Date today=new Date();
		DateFormat f1= DateFormat.getDateInstance();
		DateFormat f2= DateFormat.getTimeInstance();
		TimeField.setText(f1.format(today)+ " " + f2.format(today));
	}
	public String myTan (String s)
	{
		double d=Double.parseDouble(s);
		if(d==90)
			throw new DivideByZeroException("非法输入");
		return formatResult(Math.tan(d*PI/180));
	}
	public String mySqrt(String s)
	{
		double d=Double.parseDouble(s);
		if(d<0)
			throw new DivideByZeroException("非法输入");
		return formatResult(Math.sqrt(d));

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

		Calcular c=new Calcular();
		c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}


}