experiment6.java

java实验答案。其中包括：金额的中文大写方式

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Experiment6 extends WindowAdapter implements ActionListener{
    int w=0,u=0;
	double a=0.0,c=0.0,d=0;
	JFrame f;
	JTextField tf;
	JPanel pl,p2; 
	JLabel l;                                                  
	JButton b[]=new JButton[25];
	GridLayout grid;
	public void display(){
		f=new JFrame("计算器");
		f.setSize(400,350);
		f.setLocation(300,300);
		f.setBackground(Color.lightGray);
		tf=new JTextField(30);
		tf.setHorizontalAlignment(JTextField.RIGHT);
		tf.setEditable(false);
		l=new JLabel("           *****************  ********************   ***************");
		p2=new JPanel();
		p2.setLayout(new GridLayout(3,1));
		p2.add(l);
		p2.add(tf);
		f.getContentPane().add(p2,"North");
		pl=new JPanel();
		grid=new GridLayout(5,5);
		pl.setLayout(grid);
		f.getContentPane().add(pl);
		b[0]=new JButton("7");
        b[1]=new JButton("8");
    	b[2]=new JButton("9");
        b[3]=new JButton("/");
    	b[4]=new JButton("sqrt");
     	b[5]=new JButton("4");
    	b[6]=new JButton("5");
	    b[7]=new JButton("6");
	    b[8]=new JButton("*");
	    b[9]=new JButton("%");
    	b[10]=new JButton("1");
    	b[11]=new JButton("2");
    	b[12]=new JButton("3");
    	b[13]=new JButton("-");
    	b[14]=new JButton("1/x");
    	b[15]=new JButton("0");
    	b[16]=new JButton("+/-");
    	b[17]=new JButton(".");
    	b[18]=new JButton("+");
		b[19]=new JButton("=");
    	b[20]=new JButton("退格");
    	b[21]=new JButton("C");
    	b[22]=new JButton("MC");
    	b[23]=new JButton("ME");
    	b[24]=new JButton("MR");
    	for(int i=0;i<25;i++){
    	    b[i].setBackground(Color.green);
    	    b[i].setForeground(Color.blue);
    	}
    	pl.add(b[0]);
    	pl.add(b[1]);
    	pl.add(b[2]);
    	pl.add(b[3]);
    	pl.add(b[4]);	
    	pl.add(b[5]);	
    	pl.add(b[6]);	
    	pl.add(b[7]);	
    	pl.add(b[8]);	
    	pl.add(b[9]);
    	pl.add(b[10]);	
    	pl.add(b[11]);
    	pl.add(b[12]);
    	pl.add(b[13]);
    	pl.add(b[14]);
    	pl.add(b[15]);
    	pl.add(b[16]);
   		pl.add(b[17]);
   		pl.add(b[18]);
   		pl.add(b[19]);
   		pl.add(b[20]);
   		pl.add(b[21]);
   		pl.add(b[22]);
   		pl.add(b[23]);
   	    pl.add(b[24]);
     	b[0].addActionListener(this);
    	b[1].addActionListener(this);
    	b[2].addActionListener(this);
    	b[3].addActionListener(this);
    	b[4].addActionListener(this);
    	b[5].addActionListener(this);
     	b[6].addActionListener(this);
    	b[7].addActionListener(this);
    	b[8].addActionListener(this);
    	b[9].addActionListener(this);
    	b[10].addActionListener(this);
    	b[11].addActionListener(this);
    	b[12].addActionListener(this);
    	b[13].addActionListener(this);
    	b[14].addActionListener(this);
    	b[15].addActionListener(this);
    	b[16].addActionListener(this);
    	b[17].addActionListener(this);
    	b[18].addActionListener(this);
    	b[19].addActionListener(this);
    	b[20].addActionListener(this);
    	b[21].addActionListener(this);
      	b[22].addActionListener(this);
    	b[23].addActionListener(this);
    	b[24].addActionListener(this);
    	f.addWindowListener(this);
    	f.setVisible(true);
    }
    public void windowClosing(WindowEvent e){
	    System.exit(0);
    }
    public void actionPerformed(ActionEvent e){
    	if((e.getSource()==b[0])|(e.getSource()==b[1])|(e.getSource()==b[2])|(e.getSource()==b[5])|(e.getSource()==b[6])|(e.getSource()==b[7])|(e.getSource()==b[10])|(e.getSource()==b[11])|(e.getSource()==b[12])|(e.getSource()==b[15])){
           if(u==1){
    	      tf.setText("");
    	      u=0;
           }
    	   tf.setText(tf.getText()+e.getActionCommand());     //显示数字
        }
        
    	if(e.getSource()==b[21]){      //清空
    	    tf.setText(""); 
    	}
    	if(e.getSource()==b[17]){ //显示小数点
    	    int r=0;     
    		if(r==0){
    				tf.setText(tf.getText()+e.getActionCommand());
    				r=1;
    		}
    		else{
    			tf.setText(tf.getText());
    		}
    	}
    	if(e.getSource()==b[20]){      //退格
    		String str=tf.getText();
    		if(str.length()!=0){
    				str=str.substring(0,str.length()-1);
    	    	tf.setText(str);
    		}
    	}
    	
    	if(e.getSource()==b[16]){       //显示正负号
    		a=Double.parseDouble(tf.getText());
    		if(a>0.0){
    			a=-a;
    			tf.setText(Double.toString(a));
    		}
    		else{
    			tf.setText(Double.toString(-a));
    		}	
    	}
    	
    	if(e.getSource()==b[14]){      // "1/x"
    		a=1/Double.parseDouble(tf.getText());
    			tf.setText(Double.toString(a));
    	}
    	if(e.getSource()==b[4]){       //"sqrt()"
        	a=Math.sqrt(Double.parseDouble(tf.getText()));
    		tf.setText(Double.toString(a));
    	}
    	if(w==0){                       //数字算法
    		if(e.getSource()==b[18]){   //+
    			a=Double.parseDouble(tf.getText());
    			w=1;
    			tf.setText("");
    		}
    	    if(e.getSource()==b[13]){    //"-"
    			a=Double.parseDouble(tf.getText());
    		    w=2;
    		   	tf.setText("");
    		}
       	    if(e.getSource()==b[8]){    //"*"
    			a=Double.parseDouble(tf.getText());
    		    w=3;
    			tf.setText("");
    		}
    		if(e.getSource()==b[3]){    //"/"
    			a=Double.parseDouble(tf.getText());
    			w=4;
    			tf.setText("");
    		}
    		if(e.getSource()==b[9]){    //" %"
    			a=Double.parseDouble(tf.getText());
    			w=5;
    			tf.setText("");
    		}
    	
    	}
    	else{
    		if(e.getSource()==b[18]){
    			switch(w){
    				case 1:a=a+Double.parseDouble(tf.getText());break;
    				case 2:a=a-Double.parseDouble(tf.getText());break;
    				case 3:a=a*Double.parseDouble(tf.getText());break;
    				case 4:a=a/Double.parseDouble(tf.getText());break;
    				case 5:a=a%Double.parseDouble(tf.getText());break;
    			}
    			w=1;
    			tf.setText("");
    		}
    		if(e.getSource()==b[13]){
    			switch(w){
    				case 1:a=a+Double.parseDouble(tf.getText());break;
    				case 2:a=a-Double.parseDouble(tf.getText());break;
    				case 3:a=a*Double.parseDouble(tf.getText());break;
    				case 4:a=a/Double.parseDouble(tf.getText());break;
    				case 5:a=a%Double.parseDouble(tf.getText());break;
    			}
    			w=2;
    			tf.setText("");
    		}
    		if(e.getSource()==b[8]){
    			switch(w){
    				case 1:a=a+Double.parseDouble(tf.getText());break;
    				case 2:a=a-Double.parseDouble(tf.getText());break;
    				case 3:a=a*Double.parseDouble(tf.getText());break;
    				case 4:a=a/Double.parseDouble(tf.getText());break;
    				case 5:a=a%Double.parseDouble(tf.getText());break;
    			}
    			w=3;
    			tf.setText("");
    		}
    		if(e.getSource()==b[3]){
    			switch(w){
    				case 1:a=a+Double.parseDouble(tf.getText());break;
    				case 2:a=a-Double.parseDouble(tf.getText());break;
    				case 3:a=a*Double.parseDouble(tf.getText());break;
    				case 4:a=a/Double.parseDouble(tf.getText());break;
    				case 5:a=a%Double.parseDouble(tf.getText());break;
    			}
    			w=4;
    			tf.setText("");
    		}
    		if(e.getSource()==b[9]){
    			switch(w){
    				case 1:a=a+Double.parseDouble(tf.getText());break;
    				case 2:a=a-Double.parseDouble(tf.getText());break;
    				case 3:a=a*Double.parseDouble(tf.getText());break;
    				case 4:a=a/Double.parseDouble(tf.getText());break;
    				case 5:a=a%Double.parseDouble(tf.getText());break;

    			}
    			w=5;
    			tf.setText("");
    		}
    		if(e.getSource()==b[19]){
    			c=Double.parseDouble(tf.getText());
    			int i=0;
    			switch(w){
    				 case 0:tf.setText(tf.getText());break;
    				 case 1:a=a+c;tf.setText(Double.toString(a));break;
    				 case 2:a=a-c;tf.setText(Double.toString(a));break;
    				 case 3:a=a*c;tf.setText(Double.toString(a));break;
    				 case 4:a=a/c;tf.setText(Double.toString(a));break;
    				 case 5:a=a%c;tf.setText(Double.toString(a));break;
    			   }
    			 w=0;
    			 u=1;
    		}
    	}
   	}
    public static void main(String args[]){
	    (new Experiment6()).display();
    }
}