密码包中哈希函数的哈希值(Hash of hash functions in cryptonite package)

 在按钮上添加一个keylistener（使用KeyBindings会更好）。 
 
 为当前面板的索引创建两个int变量（例如x，y）。 
 
 在keyPressed（KeyEvent e）方法中，从当前面板中删除该按钮并将其添加到新面板。 
 
 注意：如果要使用键移动按钮，则按钮必须具有焦点。 
 
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MyFrame extends JFrame {

    private JPanel [][] innerCells;
    private JButton b = new JButton("G");
    private int x=0;
    private int y=0;
    private final int size=10;

    public MyFrame() {
        JFrame fr = new JFrame("Final Exams");
        fr.setSize(800, 600);

        fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        fr.setVisible(true);
        fr.setLocationRelativeTo(null);

        JPanel p = new JPanel(new GridLayout(size, size));

        innerCells = new JPanel[size][size];

        for(int i=0;i<size;i++){
            for(int j=0;j<size;j++){
                innerCells[i][j] = new JPanel();
                innerCells[i][j].setBorder(BorderFactory.createLineBorder(Color.orange));
               p.add(innerCells[i][j]);
            }
        }
        innerCells[0][0].add(b);
        fr.add(p);  

        b.addKeyListener(new KListener());
    }

    private class KListener extends KeyAdapter{
        public void keyPressed(KeyEvent e){
            innerCells[x][y].remove(b);
            innerCells[x][y].repaint();
            int keyCode = e.getKeyCode();
            switch( keyCode ) { 
                case KeyEvent.VK_UP:
                    x= x-1;
                        break;

                case KeyEvent.VK_DOWN:
                    x= (x+1)%size;
                        break;

                case KeyEvent.VK_LEFT:
                    y= y-1;
                        break;
                case KeyEvent.VK_RIGHT :
                    y= (y+1)%size; 
                        break;
            }
            if(x<0) x=size-1;
            if(y<0)y=size-1;
            innerCells[x][y].add(b);

            innerCells[x][y].revalidate();
            b.requestFocus();
    }
   ´        }

    public static void main(String[] args){
            MyFrame f = new MyFrame();
    }
}

Guys i manage to solve at last this problem! here is the solution..I have done it with KeyListener but i think as @MadProgrammer says with key bindings its easier!
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class Askhsh6 {

    int gr, st;
    Dimension dim;

    public Askhsh6() {
        final JFrame fr1 = new JFrame("a Title");
        fr1.setSize(800, 600);
        fr1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        fr1.setVisible(true);
        fr1.setResizable(false);

        final JButton b = new JButton("G");
        dim = new Dimension(70, 50);
        b.setSize(dim);
        b.setFocusable(false);
        b.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                b.validate();
                b.repaint();
                boolean pop = b.isFocusOwner();

                pop = b.isFocusOwner();
                System.out.println("" + pop);
            }
        });
        final JPanel[][] p;
        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(8, 6));

        p = new JPanel[8][6];

        for (int i = 0; i < 8; i++) {
            for (int j = 0; j < 6; j++) {
                p[i][j] = new JPanel();
                p[i][j].setLayout(new BorderLayout());

                p[i][j].setBorder(BorderFactory.createLineBorder(Color.orange));
                p1.add(p[i][j]);

            }
        }
        p[0][0].add(b, BorderLayout.CENTER);
        gr = st = 0;

        fr1.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent ke) {
                if (ke.getKeyCode() == KeyEvent.VK_DOWN) {
                    System.out.println("DOWN");
                    if (gr + 1 < 8) {
                        p[gr][st].remove(b);
                        gr = gr + 1;
                        p[gr][st].add(b, BorderLayout.CENTER);

                        fr1.repaint();
                    }
                }
                if (ke.getKeyCode() == KeyEvent.VK_UP) {
                    System.out.println("UP");
                    if (gr - 1 >= 0) {
                        p[gr][st].remove(b);
                        gr = gr - 1;
                        p[gr][st].add(b, BorderLayout.CENTER);

                        fr1.repaint();
                    }
                }
                if (ke.getKeyCode() == KeyEvent.VK_LEFT) {
                    System.out.println("LEFT");
                    if (st - 1 >= 0) {
                        p[gr][st].remove(b);
                        st = st - 1;
                        p[gr][st].add(b, BorderLayout.CENTER);

                        fr1.repaint();
                    }
                }
                if (ke.getKeyCode() == KeyEvent.VK_RIGHT) {
                    System.out.println("RIGHT");
                    if (st + 1 < 6) {
                        p[gr][st].remove(b);
                        st = st + 1;
                        p[gr][st].add(b, BorderLayout.CENTER);

                        fr1.repaint();
                    }
                }
            }
        });
        fr1.add(p1);
        fr1.validate();
    }
}