hffgui.java

赫夫曼编译码器： 用哈夫曼编码进行通信可以大大提高信道利用率

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


class MyCanvas extends Canvas
{
	    MyCanvas()
	    {
		   setSize(50,500);
	    }
	    
	    
    public void paint(Graphics g)
	{  
		/*
		input "a good wood"
		encoding:
		a  100  1   
		g  101  1
		w  110  1
		d  111  2
		o  0    4
		*/
		g.setColor(Color.pink);
		String s1="100q";
		String s2="11s";
		String s3="1010w";
		String s4="1011u";
	for(int j=0;j<=3;j++)
    {	
		int y=70;
		String s="";
		if(j==0)s=s1;
		else if(j==1)s=s2;
		else if(j==2)s=s3;
		else if(j==3)s=s4;
		
		int index=0;
		int length=s.length();
		int x[]=new int[length+1];
		x[0]=270;
		g.fillOval(x[0],y,30,30);
		g.drawString("",265,82);
		x[index+1]=x[index];
		
		
		
		for(index=0;index<=length-2;index++)
		{char c=s.charAt(index);
		    
		  
			if(c=='1')
			{
				
				x[index+1]=x[index]+60;
				
				g.drawLine(x[index]+15,y+=15,x[index+1]+15,y+55);
				g.setColor(Color.black);
				g.drawString("1",(x[index+1]+15+x[index]+15)/2,y+35);
				g.setColor(Color.magenta);
				g.fillOval(x[index+1],y+=40,30,30);
			}
			else if(c=='0')
			{
			
		             
				
				
				
				
				x[index+1]=x[index]-50;
			g.drawLine(x[index]+15,y+=15,x[index+1]+15,y+55);
			g.setColor(Color.black);
				g.drawString("0",(x[index+1]+15+x[index]+15)/2,y+35);
				g.setColor(Color.BLUE);
				g.fillOval(x[index+1],y+=40,30,30);
				
			}

	
		if(index==length-2){g.setColor(Color.black);	 	
     if(j==0){g.drawString("q3",x[index+1]+15,y+15);}
	else if(j==1){g.drawString("s8",x[index+1]+15,y+15);}
	else if(j==2){g.drawString("w1",x[index+1]+15,y+15);}
	
	else if(j==3){g.drawString("u3",x[index+1]+15,y+15);}
	
	}	  
	    
		  
	    
	    
	    }
	
	
	
	
		   
    }
	
	
		g.setFont(new Font("txt",Font.BOLD+Font.ITALIC,28));
		
	   
		
		
	 }      
}


public class hffgui extends Frame
{
    
        Frame f=new Frame();
        Button btn11=new Button("编码读入：");
        Button btn12=new Button("译码读入：");
        Button btn2=new Button("编码结果");
        Button btn3=new Button("译码结果");
        Button btn4=new Button("退出");
        TextArea txt1=new TextArea();
        TextArea txt11=new TextArea();
        TextArea txt2=new TextArea();
        TextArea txt21=new TextArea();
        ButtonListener btnlistener=new ButtonListener();
        
	public hffgui()
    {
    	MyCanvas c=new MyCanvas();
		c.setBounds(0,20,800,600);
		c.setBackground(Color.cyan);
		
    	f.setLayout(null);
    	f.add(btn11);
    	f.add(btn12);
    	f.add(btn2);
    	f.add(btn3);
    	f.add(btn4);
    	f.add(txt1);
    	f.add(txt11);
    	f.add(txt2);
    	f.add(txt21);
    	
    	f.add(c);
    	btn11.setBounds(30,30,100,40);//设置大小
    	btn12.setBounds(30,380,100,40);//设置大小
    	
    	btn2.setBounds(30,450,100,40);
    	btn3.setBounds(30,550,100,40);
    	btn4.setBounds(30,650,100,40);
    	  
    	 txt1.setBounds(150,30,450,50); 
    	   txt2.setBounds(150,380,450,50);	   	
    	txt11.setBounds(150,450,450,50);
    	txt21.setBounds(150,550,450,50);
    		btn11.addActionListener(btnlistener);
    	btn12.addActionListener(btnlistener);//监听
    	btn2.addActionListener(btnlistener);
    	btn3.addActionListener(btnlistener);
    	btn4.addActionListener(btnlistener);
    	btn11.setForeground(Color.DARK_GRAY);
    	btn12.setForeground(Color.DARK_GRAY);//设置颜色
        btn2.setForeground(Color.DARK_GRAY);
        btn3.setForeground(Color.DARK_GRAY);
        btn4.setForeground(Color.DARK_GRAY);
        btn11.setBackground(Color.GREEN);
        btn12.setBackground(Color.GREEN);
        btn2.setBackground(Color.GREEN);
        btn3.setBackground(Color.GREEN);
        btn4.setBackground(Color.GREEN);
        
        setBackground(Color.YELLOW);//设置背景颜色（已被覆盖，转变为边框颜色）
        
    	f.setSize(700,750);
    	f.setTitle("HuffmanTree Demo");
    	
    	f.setVisible(true);
    	f.setResizable(false);
    	//使窗口能正常关闭        
        f.addWindowListener(new WindowAdapter()
        {
        	public void windowClosing(WindowEvent e)
        	{
        		System.exit(0);
        	}
        });
		
     }
     private class ButtonListener implements ActionListener
     {
     	public void actionPerformed(ActionEvent e)
     	{
     		if(e.getActionCommand().equals("编码读入："))
     		{
     	    }
     	     else if(e.getActionCommand().equals("编码结果")){
     	     	
     	     }
     	    
     	    else if(e.getActionCommand().equals("译码读入："))
     	    {
     	    	
     	    
     	    	
     	    }
     	    else if(e.getActionCommand().equals("译码结果"))
     	    {
     	    }
     	    else if(e.getActionCommand().equals("退出"))
     	    {
     	    	System.exit(1);
     	    }
     	
       }
    }

    public static void main(String args[])
	{
	   hffgui x=new hffgui();
	}
  }