sina.java

这是一个用java代码编写的一个小应用软件

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class sina extends WindowAdapter 
{
	public static void main(String []args)
	{
		(new sina()).chuangkou();
	}
	public void windowClosing(WindowEvent e)
	{
		System.exit(0);
	}
	JTextField t=new JTextField(25);
	JButton b=new JButton("1");
	JButton b2=new JButton("2");
	JButton b3=new JButton("3");
	JButton b4=new JButton("4");
	JButton b5=new JButton("5");
	JButton b6=new JButton("6");
	JButton b7=new JButton("7");
	JButton b8=new JButton("8");
	JButton b9=new JButton("关闭");
	JButton b10=new JButton("清空");
	JButton b11=new JButton("9");
	JButton b12=new JButton("0");
	JButton b0=new JButton("=");
	JButton b13=new JButton("+");
	JButton b14=new JButton("-");
	JButton b15=new JButton("*");
	JButton b16=new JButton("/");
	JButton b17=new JButton("说明");
	JPanel p2=new JPanel();
	JPanel p1=new JPanel();
	public void chuangkou()
	{
		JFrame f=new JFrame("小小计算器");
		f.addWindowListener(this);
		f.setLocation(350,200);
		f.setBackground(Color.green);
		f.setSize(300,300);
		f.setLayout(new BorderLayout());
		p2.setLayout(new GridLayout(6,3,1,1));
		b9.setBackground(Color.yellow);
		//b0.setBackground(Color.blue);
		b9.addActionListener(new close());
		b.addActionListener(new zhong());
		b2.addActionListener(new zhong());
		b3.addActionListener(new zhong());
		b4.addActionListener(new zhong());
		b5.addActionListener(new zhong());
		b6.addActionListener(new zhong());
		b7.addActionListener(new zhong());
		b8.addActionListener(new zhong());
		b10.addActionListener(new zhong());
		b11.addActionListener(new zhong());
		b12.addActionListener(new zhong());
		b0.addActionListener(new zhong());
		b13.addActionListener(new zhong());
		b14.addActionListener(new zhong());
		b15.addActionListener(new zhong());
		b16.addActionListener(new zhong());
		b17.addActionListener(new zhong());
		f.add(p1,"North");
		f.add("Center",p2);
		p1.add(t);
		p2.add(b);
		p2.add(b2);
		p2.add(b3);
		p2.add(b4);
		p2.add(b5);
		p2.add(b6);
		p2.add(b7);
		p2.add(b8);
		p2.add(b11);
		p2.add(b12);
		p2.add(b13);
		p2.add(b14);
		p2.add(b15);
		p2.add(b16);
		p2.add(b17);	
		p2.add(b9);	
		p2.add(b10);
		p2.add(b0);
		f.setVisible(true);
	}	
	class zhong implements ActionListener
	{
		public  void actionPerformed(ActionEvent e)
		{
			JButton tt=(JButton)e.getSource();
			if (tt.getLabel()=="=")
			{
				int b;
				double c = 0.0;
				String di,de;
				String string=t.getText();
				b=t.getText().indexOf("+");		
				char op [] = {'+','-','*','/'};
				char inputOp;
				int i=0;
				for(;i<op.length;i++)
				{
					b=t.getText().indexOf(op[i]);
					if(b!=-1)
						break;				
				}
				di=string.substring(0,b);
				de=string.substring((b+1));
				System.out.println(di+"	"+de);
				switch(op[i])
				{
					case '+':
						c=Double.parseDouble(di)+Double.parseDouble(de);
						break;
					case '-':
						c=Double.parseDouble(di)-Double.parseDouble(de);
						break;
					case '*':
						c=Double.parseDouble(di)*Double.parseDouble(de);
						break;
					case '/':
						c=Double.parseDouble(di)/Double.parseDouble(de);
						break;
					default :
						System.out.println("something is wrong...");
				}
				String aa=String.valueOf(c);
				t.setText(aa);
			}
			else
			t.setText(t.getText()+tt.getLabel());
			if(tt.getLabel()=="说明")
			t.setText("先清空再使用 开发者：明志");
			if(tt.getLabel()=="清空")
			t.setText("");
		}
	}
}
class close implements ActionListener
{
	public void actionPerformed	(ActionEvent e)
	{
		System.exit(0);
	}
}