jlab12.java

Java版计算器

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

public class JLab12 implements ActionListener{
	JFrame f = new JFrame("计算器");
   	JPanel p0 = new JPanel();
  	JPanel p1 = new JPanel();
   	JPanel p2 = new JPanel();
   	JPanel p3 = new JPanel();
   	JPanel p4 = new JPanel();
   	JPanel p5 = new JPanel();
   	JPanel p6 = new JPanel();
   	JPanel p7 = new JPanel();
   	JPanel p8 = new JPanel();
   	JPanel p9 = new JPanel();
   	JPanel p10 = new JPanel();
   	JPanel p11 = new JPanel();
   	JTextField t = new JTextField("0.",32);
   	JLabel l= new JLabel("       ");
   	JButton b1 = new JButton("7"); 
   	JButton b2 = new JButton("8");
   	JButton b3 = new JButton("9");
   	JButton b4 = new JButton("/");
   	JButton b5 = new JButton("sqrt");
   	JButton b6 = new JButton("4");
   	JButton b7 = new JButton("5");
   	JButton b8 = new JButton("6");
   	JButton b9 = new JButton("*");
   	JButton b10 = new JButton("%");
   	JButton b11 = new JButton("1");
   	JButton b12 = new JButton("2");
   	JButton b13 = new JButton("3");
   	JButton b14 = new JButton("-");
   	JButton b15 = new JButton("1/x");
   	JButton b16 = new JButton("0");
   	JButton b17 = new JButton("+/-");
   	JButton b18 = new JButton(".");
   	JButton b19 = new JButton("+");
   	JButton b20 = new JButton("=");
   	JButton b21 = new JButton("Backspace");
   	JButton b22 = new JButton("CE");
   	JButton b23 = new JButton("C");
   	JButton b24 = new JButton("MC");
   	JButton b25 = new JButton("MR");
   	JButton b26 = new JButton("MS");
   	JButton b27 = new JButton("M+");
   	String str,str1,str2;//str、str1存放文本框内容,str2存放记忆
   	double x,y;//用于输入源操作数和目的操作数
   	int c=0,p=0;//c控制"="的有效性,p控制"."的有效性
   	int s=0,w=0;//s控制文本框内容,w控制错误状态
	public JLab12(){
		f.setBackground(Color.white);
    	t.setFocusable(false);
    	t.setHorizontalAlignment(JTextField.RIGHT);
    	l.setBackground(Color.white);
    	l.setHorizontalAlignment(JLabel.LEFT);
		l.setVerticalAlignment(JLabel.EAST);
		l.setHorizontalTextPosition(JLabel.CENTER);
		l.setVerticalTextPosition(JLabel.CENTER);
		l.setBorder(BorderFactory.createLoweredBevelBorder());
    	f.setLayout(new BorderLayout());
		p0.setLayout(new BorderLayout());
    	p1.add(t);
    	p2.setLayout(new BorderLayout());
    	p5.setLayout(new BorderLayout());
   		p10.setLayout(new GridLayout(4,5,10,10));
   		p11.setLayout(new GridLayout(4,1,10,10));
   		b1.setForeground(Color.blue);
   		b1.setFocusable(false);
    	b2.setForeground(Color.blue);
    	b2.setFocusable(false);
    	b3.setForeground(Color.blue);
    	b3.setFocusable(false);
    	b4.setForeground(Color.red);
    	b4.setFocusable(false);
    	b5.setForeground(Color.blue);
    	b5.setFocusable(false);
    	b6.setForeground(Color.blue);
    	b6.setFocusable(false);
    	b7.setForeground(Color.blue);
    	b7.setFocusable(false);
    	b8.setForeground(Color.blue);
    	b8.setFocusable(false);
    	b9.setForeground(Color.red);
    	b9.setFocusable(false);
    	b10.setForeground(Color.blue);
    	b10.setFocusable(false);
    	b11.setForeground(Color.blue);
    	b11.setFocusable(false);
    	b12.setForeground(Color.blue);
    	b12.setFocusable(false);
    	b13.setForeground(Color.blue);
    	b13.setFocusable(false);
    	b14.setForeground(Color.red);
    	b14.setFocusable(false);
    	b15.setForeground(Color.blue);
    	b15.setFocusable(false);     
    	b16.setForeground(Color.blue);
    	b16.setFocusable(false);
    	b17.setForeground(Color.blue);
    	b17.setFocusable(false);
    	b18.setForeground(Color.blue);
    	b18.setFocusable(false);
    	b19.setForeground(Color.red);
    	b19.setFocusable(false);
    	b20.setForeground(Color.red);
    	b20.setFocusable(false);
    	b21.setForeground(Color.red);
    	b21.setFocusable(false);
    	b22.setForeground(Color.red);
    	b22.setFocusable(false);
    	b23.setForeground(Color.red);
    	b23.setFocusable(false);
    	b24.setForeground(Color.red);
    	b24.setFocusable(false);
    	b25.setForeground(Color.red);
    	b25.setFocusable(false);
    	b26.setForeground(Color.red);
    	b26.setFocusable(false);
    	b27.setForeground(Color.red);
    	b27.setFocusable(false);
    	p10.add(b1);
    	p10.add(b2);
    	p10.add(b3);
    	p10.add(b4);
    	p10.add(b5);
    	p10.add(b6);   
    	p10.add(b7);
    	p10.add(b8);
    	p10.add(b9);
    	p10.add(b10);
    	p10.add(b11);
    	p10.add(b12);
    	p10.add(b13);
    	p10.add(b14);
    	p10.add(b15);  
    	p10.add(b16);
    	p10.add(b17);
    	p10.add(b18);
    	p10.add(b19);
    	p10.add(b20);
    	p11.add(b24);
    	p11.add(b25);
    	p11.add(b26);
    	p11.add(b27);
    	p3.add(b21);
    	p3.add(b22);
    	p3.add(b23);
    	p4.add(l);
    	p5.add(p4,"West");
    	p5.add(p3,"East");
    	p2.add(p10,"East");
    	p2.add(p11,"West");
    	p0.add(p1,"North");
    	p0.add(p2,"South");
    	p0.add(p5,"Center");
    	p0.add(p4,"West");
    	f.getContentPane().add(p0,"Center");
    	f.getContentPane().add(p6,"North");
    	f.getContentPane().add(p7,"East");
    	f.getContentPane().add(p8,"West");
    	f.getContentPane().add(p9,"South");
    	f.setSize(420,272);
    	f.setLocation(100,100);
    	f.setVisible(true);
    	f.setResizable(false);
  		b1.addActionListener(this);
  		b2.addActionListener(this);
  		b3.addActionListener(this);
 		b4.addActionListener(this);
 		b5.addActionListener(this);
  		b6.addActionListener(this);
  		b7.addActionListener(this);
  		b8.addActionListener(this);
  		b9.addActionListener(this);
  		b10.addActionListener(this);
  		b11.addActionListener(this);
  		b12.addActionListener(this);
  		b13.addActionListener(this);
  		b14.addActionListener(this);
  		b15.addActionListener(this);
  		b16.addActionListener(this);
  		b17.addActionListener(this);
  		b18.addActionListener(this);
  		b19.addActionListener(this);
  		b20.addActionListener(this);
  		b21.addActionListener(this);
  		b22.addActionListener(this);
  		b23.addActionListener(this);
  		b24.addActionListener(this);
  		b25.addActionListener(this);
  		b26.addActionListener(this);
  		b27.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e){
		if(w==0){
			if((e.getActionCommand()).equals(".")){
				if(p==0){
					if(s==0){
						t.setText("0.");
						s=1;
					} 
					else t.setText(t.getText()+".");										
				}
				p=1;
			}
			else if((e.getActionCommand()).equals("CE")){
				t.setText("0.");
				w=0;
			}
			else if((e.getActionCommand()).equals("C")){
				t.setText("0.");
				w=0;
			}	
			else if((e.getActionCommand()).equals("Backspace")){
				str=t.getText();
				if((str.length()>1)&&!(str.equals("0."))){
					s=1;
					str=str.substring(0,str.length()-1);
					t.setText(str);
				}
				else{
					s=0;
					t.setText("0.");
				}
			}
			else if((e.getActionCommand()).equals("MS")){
        		str2=t.getText();
        		l.setText("  M  ");  
     		}
     		else if((e.getActionCommand()).equals("MC")){
        		str2=null;
        		l.setText("       ");    
     		}
     		else if((e.getActionCommand()).equals("MR")){
        		if(str2!=null) t.setText(str2);
        		s=0;    
     		}
     		else if((e.getActionCommand()).equals("M+")){
        		if(!(t.getText().equals("0."))){
        			x=Double.valueOf(str2);
        			y=Double.valueOf(t.getText());
        	    	x+=y;
        	    	str2=Double.toString(y);
        		}
        		else{
        			x=Double.valueOf(str2);
        	    	x*=2;
        	    	str2=Double.toString(x);
        		}    
     		}
     		else if((e.getActionCommand()).equals("+/-")){
        		x = Double.parseDouble(t.getText());
        		s=0; 
        		str1=Double.toString((-x));
          		t.setText(str1);    
     		}				
     		else if((e.getActionCommand()).equals("1/x")){
        		x=Double.parseDouble(t.getText());
        		s=0;  
        		if(x==0){
        		 	t.setText("Error");
        			w=1;
        		}
            	else{
              		str1=Double.toString((Math.pow(x,-1)));
            		t.setText(str1);  
            	}    
     		}
     		else if((e.getActionCommand()).equals("sqrt")){
        		x=Double.parseDouble(t.getText());
        		s=0;  
        		if(x<0){
        		 	t.setText("Error");
        		 	w=1;
        		}
            	else{
              		str1=Double.toString((Math.sqrt(x)));
                	t.setText(str1);  
            	}   
     		}
     		else if((e.getActionCommand()).equals("%")){
        		x=Double.parseDouble(t.getText());
        		s=0;
        		c=1;
        		p=0; 
        		str1=e.getActionCommand();    
     		}
			else if((e.getActionCommand()).equals("+")){
        		x=Double.parseDouble(t.getText());
        		s=0;
        		c=1;
        		p=0; 
        		str1=e.getActionCommand();    
     		}
 			else if((e.getActionCommand()).equals("-")){
        		x=Double.parseDouble(t.getText());
        		s=0;
        		c=1;
        		p=0;
        		str1=e.getActionCommand();    
     		}
  			else if((e.getActionCommand()).equals("*")){
        		x=Double.parseDouble(t.getText());    
        		s=0;
        		c=1;
        		p=0; 
        		str1=e.getActionCommand();    
     		}
			else if((e.getActionCommand()).equals("/")){
        		x=Double.parseDouble(t.getText());
        		s=0;
        		c=1;
        		p=0; 
        		str1=e.getActionCommand();    
     		}
			else if((e.getActionCommand()).equals("=")){
				if(c==1){
					if(str1.equals("%")){ 
        				y=Double.parseDouble(t.getText());
          				str1=Double.toString(x%y);
          				t.setText(str1);
          				s=0;
        			}
        			if(str1.equals("+")){
        				y=Double.parseDouble(t.getText()); 
          				str1=Double.toString(x+y);
          				t.setText(str1);
          				s=0;
        			}
        			if(str1.equals("-")){
        				y=Double.parseDouble(t.getText());
              			str1=Double.toString(x-y);
              			t.setText(str1);
              			s=0;
       				}
        			if(str1.equals("*")){
        				y=Double.parseDouble(t.getText());
              			str1=Double.toString(x*y);
              			t.setText(str1);
              			s=0;
        			}
        			if(str1.equals("/")){
        				y=Double.parseDouble(t.getText());
        	  			if(y==0){
        	  				t.setText("Error");
        	  				w=1;
        	  			}        	  		
             			else{
              				str1=Double.toString(x/y);
                			t.setText(str1);  
              			}
              			s=0;
        			}
        			c=0;    
				}
			}
			else{ 
      			str=e.getActionCommand();
      			if(s==0){
      				s=1;
      				t.setText(str);
      			}
      			else t.setText(t.getText()+str);		        	            
      		} 			
		}
		else if((e.getActionCommand()).equals("CE")){
				t.setText("0.");
				w=0;
		}					 				                                
	}
	public static void main(String[] args){
     	new JLab12();
  	}
}