import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
public class MoveExample
{
   public static void main(String args[])
   {
      new Hua_Rong_Road();
   }
}
class Person extends JButton implements FocusListener  
{ 
   int number;
   Color c;
   Person(int number,Icon s)
   {  
      super(s);
      this.number=number;
      c=getBackground();
      setFont(new Font("宋體",Font.CENTER_BASELINE,14));
      addFocusListener(this);         // 當前按鈕注冊為本身的監視器
   }
   public void focusGained(FocusEvent e)       // FocusListener接口方法的聲明
   {  
       setBackground(Color.cyan);
   }
   public void focusLost(FocusEvent e)       // FocusListener接口方法的聲明
   {   
       setBackground(c);
   }
}
class Hua_Rong_Road extends JFrame implements KeyListener,MouseListener,ActionListener
{  
   Person person[]=new Person[10];
   JButton left,right,above,below;  
   JButton restart=new JButton("重新開始");
   Container con;
   public Hua_Rong_Road()
   {  
     init();
     setBounds(100,100,320,360);
     setVisible(true);
     validate();
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
   public void init()
   {
      con=getContentPane();
      con.setLayout(null); 
      con.add(restart);
      restart.setBounds(100,5,120,25);
      restart.addActionListener(this);
      Icon icon[]={new ImageIcon("a.jpg"),new ImageIcon("b.jpg"),new ImageIcon("c.jpg"),new ImageIcon("d.jpg"),new ImageIcon("e.jpg"),new ImageIcon("f.jpg"),new ImageIcon("g.jpg"),new ImageIcon("g.jpg"),new ImageIcon("g.jpg"),new ImageIcon("g.jpg")}; 
      for(int i=0;i<10;i++)
      {
         
         person[i]=new Person(i,icon[i]);
        person[i].addKeyListener(this);           // 將當前窗口注冊為person[i]的KeyEvent事件監視器
        person[i].addMouseListener(this);           // 將當前窗口注冊為person[i]的MouseEvent事件監視器
         con.add(person[i]);
      }
      person[0].setBounds(104,54,100,100); 
      person[1].setBounds(104,154,100,50); 
      person[2].setBounds(54, 154,50,100); 
      person[3].setBounds(204,154,50,100); 
      person[4].setBounds(54, 54, 50,100); 
      person[5].setBounds(204, 54, 50,100);  
      person[6].setBounds(54,254,50,50);  
      person[7].setBounds(204,254,50,50); 
      person[8].setBounds(104,204,50,50); 
      person[9].setBounds(154,204,50,50); 
      person[9].requestFocusInWindow();                 // person[9]獲取焦點
      left=new JButton();  
      right=new JButton();
      above=new JButton();
      below=new JButton();
      con.add(left);
      con.add(right);
      con.add(above);
      con.add(below);
      left.setBounds(49,49,5,260);
      right.setBounds(254,49,5,260);
      above.setBounds(49,49,210,5);
      below.setBounds(49,304,210,5);
      con.validate();
   }   
   public void keyPressed(KeyEvent e) 
   {  
       Person man=(Person)e.getSource();   // 返回事件源
       if(e.getKeyCode()==KeyEvent.VK_DOWN)               // 判斷是否按下了“↓”鍵
         { 
            goDown(man); 
         }
       if(e.getKeyCode()==KeyEvent.VK_UP)               // 判斷是否按下了“↑”鍵
        { 
            goUp(man);
        }
      if(e.getKeyCode()==KeyEvent.VK_LEFT)               // 判斷是否按下了“←”鍵
        { 
            goLeft(man);
        }
      if(e.getKeyCode()==KeyEvent.VK_RIGHT)                // 判斷是否按下了“→”鍵
       { 
           goRight(man);    
       }
   }
   public void keyTyped(KeyEvent e){}
   public void keyReleased(KeyEvent e){}
   public void mousePressed(MouseEvent e)
   { 
     Person man=(Person)e.getSource();        // 返回事件源
     int x=-1,y=-1;
     x=e.getX();
     y=e.getY();
     int w=man.getBounds().width;
     int h=man.getBounds().height;
     if(y>h/2)
     {
        goDown(man); 
     } 
     if(y<h/2)
     {
        goUp(man);
     }   
     if(x<w/2)
     {
        goLeft(man);
     }
     if(x>w/2)
     {
        goRight(man);
     }
   }
   public void mouseReleased(MouseEvent e) {}
   public void mouseEntered(MouseEvent e) {}
   public void mouseExited(MouseEvent e) {}
   public void mouseClicked(MouseEvent e) {}
   public void goDown(Person man)
   {
      boolean move=true;
      Rectangle manRect=man.getBounds();
      int x=man.getBounds().x;
      int y=man.getBounds().y;
      y=y+50;
      manRect.setLocation(x,y);
      Rectangle belowRect=below.getBounds();
      for(int i=0;i<10;i++)
      { 
         Rectangle personRect=person[i].getBounds();
         if((manRect.intersects(personRect))&&(man.number!=i))
           { 
              move=false;
           }
      }
      if(manRect.intersects(belowRect))
      {   
         move=false;
      } 
      if(move==true)
      {
         man.setLocation(x,y);
      }
   }
   public void goUp(Person man)
   {
      boolean move=true;
      Rectangle manRect=man.getBounds();
      int x=man.getBounds().x;
      int y=man.getBounds().y;
      y=y-50;
      manRect.setLocation(x,y);
      Rectangle aboveRect=above.getBounds();
      for(int i=0;i<10;i++)
      { 
         Rectangle personRect=person[i].getBounds();
         if((manRect.intersects(personRect))&&(man.number!=i))
           { 
              move=false;
           }
      }
      if(manRect.intersects(aboveRect))
      {   
         move=false;
      } 
      if(move==true)
      {
         man.setLocation(x,y);
      }
   }
  public void goLeft(Person man)
   {
      boolean move=true;
      Rectangle manRect=man.getBounds();
      int x=man.getBounds().x;
      int y=man.getBounds().y;
      x=x-50;
      manRect.setLocation(x,y);
      Rectangle leftRect=left.getBounds();
      for(int i=0;i<10;i++)
      { 
         Rectangle personRect=person[i].getBounds();
         if((manRect.intersects(personRect))&&(man.number!=i))
           { 
              move=false;
           }
      }
      if(manRect.intersects(leftRect))
      {   
         move=false;
      } 
      if(move==true)
      {
         man.setLocation(x,y);
      }
   }
   public void goRight(Person man)
   {
      boolean move=true;
      Rectangle manRect=man.getBounds();
      int x=man.getBounds().x;
      int y=man.getBounds().y;
      x=x+50;
      manRect.setLocation(x,y);
      Rectangle rightRect=right.getBounds();
      for(int i=0;i<10;i++)
      { 
         Rectangle personRect=person[i].getBounds();
         if((manRect.intersects(personRect))&&(man.number!=i))
           { 
              move=false;
           }
      }
      if(manRect.intersects(rightRect))
      {   
         move=false;
      } 
      if(move==true)
      {
         man.setLocation(x,y);
      }
   } 

   public void actionPerformed(ActionEvent e)
   {  
      con.removeAll();
      init();
      validate();
      repaint();
   } 
}