mycalculation.java

题目：复杂计算器设计 要求：设计一个复杂的计算器

package myprogram;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MyCalculation extends JFrame{
	String hhnomber;
	Boolean clear=false;
	JPanel jpanel1=new JPanel();
	JPanel jpanel2=new JPanel();
	JButton[] jbutton=new JButton[20];
	JTextField jfield=new JTextField(27);
	JMenuBar m_bar=new JMenuBar();
	JMenu jmenu=new JMenu("进制转化");
	JMenuItem bin=new JMenuItem("二进制");
	JMenuItem hh=new JMenuItem("十进制");
	private boolean first=true;
	private double number1;
	private double number2;
	private int jjcc;
	private double result;//结果
	private int t=0;
	
	
	public MyCalculation(String title){
		super(title);
	    setJMenuBar(m_bar);
		m_bar.add(jmenu);
		jmenu.add(bin);
		jmenu.add(hh);
		jfield.setHorizontalAlignment(JTextField.RIGHT);
		jfield.setForeground(Color.black);
		jfield.setBackground(Color.green);
		jfield.setText("0");
		jfield.setEditable(false);//定义文本框的属性
		String anNu[]={"1","2","3","+","C","4","5","6","-","退格","7","8","9",
				"*","1/x","0","+/-",".","/","="};//从0~19
		for(int i=0;i<20;i++){
			jbutton[i]=new JButton(anNu[i]);
			jbutton[i].setForeground(Color.blue);
			
		}
		A a=new A();//数字按钮
		B b=new B();//清零按键
		C c=new C();//退格键的事件
		D d=new D();//1/x的监听
		E e=new E();//小数点监听
		F f=new F();//运算监听
		G g=new G();//运算结果
		H h=new H();//正负号监听
		Bin BIN =new Bin();
		Hin HIN=new Hin();
		for(int i=0;i<3;i++)
			jbutton[i].addActionListener(a);
		for(int i=5;i<8;i++)
			jbutton[i].addActionListener(a);
		for(int i=10;i<13;i++)
			jbutton[i].addActionListener(a);
		jbutton[15].addActionListener(a);
		jbutton[4].addActionListener(b);
		jbutton[9].addActionListener(c);
		jbutton[14].addActionListener(d);
		jbutton[17].addActionListener(e);
		jbutton[3].addActionListener(f);
		jbutton[8].addActionListener(f);
		jbutton[13].addActionListener(f);
		jbutton[18].addActionListener(f);
		jbutton[19].addActionListener(g);
		jbutton[16].addActionListener(h);
		bin.addActionListener(BIN);
		hh.addActionListener(HIN);
		//hh.addActionLlistener();
		
		jpanel1.add(jfield);//显示输入数字及运算结果的标签
		jpanel2.setLayout(new GridLayout(4,5));//设置成为4行5列的butoon布局 
		for(int i=0;i<20;i++)
			jpanel2.add(jbutton[i]);
		getContentPane().add(jpanel1,BorderLayout.NORTH);
		getContentPane().add(jpanel2,BorderLayout.CENTER);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setResizable(false);
		pack();
		setVisible(true);//可显示
		}
		
		/**数字按钮的监听*/
	class A implements ActionListener{
		public void actionPerformed(ActionEvent e){
			 if(clear){
			 clear=false;
			 jfield.setText("");
			 }
			 String input = e.getActionCommand();
			 if (first) 
	         {	if(input=="0"){
	        	 	jfield.setText("");
	        		 first=true;
	         		}
	         	else{
	            jfield.setText("");
	            first = false;
	         	}
	         }
	         jfield.setText(jfield.getText() + input);
	      }
		}
		
	class Bin implements ActionListener{
		public void actionPerformed(ActionEvent e){
			String str=jfield.getText();
			hhnomber=str;
			int count=Integer.parseInt(str);
			String str2=Integer.toBinaryString(count);
			jfield.setText(str2);
			}
	}
	
	class Hin implements ActionListener{
		
			public void actionPerformed(ActionEvent e){
				jfield.setText(hhnomber);
				
				}
	}
	
		/**清零按钮的监听*/
	class B implements ActionListener{
		public void actionPerformed(ActionEvent e){
			jfield.setText("0");
			first=true;
		}
	}
	
		/**退格按钮的监听*/
	class C implements ActionListener{
		public void actionPerformed(ActionEvent e){
			String s1,s2;
			int jflength;
			s1=jfield.getText();
			jflength=jfield.getText().length();
			if(jflength==0||jflength==1)
				jfield.setText("0");
			else{
				s2=s1.substring(0,jflength-1);
				jfield.setText(s2);
				}
			first=true;
	}
	}
	
	/**数字按钮的监听*/
	class D implements ActionListener{
		public void actionPerformed(ActionEvent e){
			double x=Double.parseDouble(jfield.getText());
			if(x==0)
				jfield.setText("正无穷大");
			else
				jfield.setText(""+1/x);
		}
	}
	
	/**小数点按钮的监听*/
	class E implements ActionListener{
		public void actionPerformed(ActionEvent e){
			if(jfield.getText().trim().indexOf('.')!=-1)
				;
			else if(jfield.getText().trim().equals("0"))
					jfield.setText("0"+e.getActionCommand());
			else
				jfield.setText(jfield.getText()+e.getActionCommand());
			first=false;
		}
	}
	
	/**运算按钮的监听*/
	class F implements ActionListener{
		int operation;
		public void actionPerformed(ActionEvent e){
			if(e.getActionCommand()=="+")
				operation=1;
			else if(e.getActionCommand()=="-")
				operation=2;
			else if(e.getActionCommand()=="*")
				operation=3;
			else if(e.getActionCommand()=="/")
				operation=4;
			number1=Double.parseDouble(jfield.getText());
			switch(operation){
			case 1:
				jjcc=1;
				first=true;
				break;
			case 2:
				jjcc=2;
				first=true;
				break;
			case 3:
				jjcc=3;
				first=true;
				break;
			case 4:
				jjcc=4;
				first=true;
				break;
			}
			}
	}
	/**运算按钮的监听*/
	class G implements ActionListener{
		public void actionPerformed(ActionEvent e){
			clear=true;
			number2=Double.parseDouble(jfield.getText());
			if(number1>Double.MAX_VALUE&&number1<Double.MIN_VALUE||number2>Double.MAX_VALUE&&number2<Double.MIN_VALUE)
				jfield.setText("数据越界");
			else{
			switch(jjcc){
			case 1://加法
				result=number1+number2;
				result=number1+number2;
				jfield.setText(""+result);
				break;
			case 2:	//减法
				result=number1-number2;
				jfield.setText(""+result);
				break;
			case 3://乘法
				result=number1*number2;
				jfield.setText(""+result);
				break;
			case 4://除法
				if(number2==0)
					jfield.setText("Error!	除数不能为零!");
				else{
				result=number1/number2;
				jfield.setText(""+result);
				}
				break;
			}
			}
			}
	}	
		/**正负号按钮的监听*/
	class H implements ActionListener{
		public void actionPerformed(ActionEvent e){
			double s=Double.parseDouble(jfield.getText());
			
			if(t%2==0)
				jfield.setText("+"+Math.abs(s));//返回为"+原数的绝对值"
			else
				jfield.setText("-"+Math.abs(s));//返回为"-原数的绝对值"
			t++;
		}
	}
	public static void main(String[] args){
		new MyCalculation("计算器");
	}
}