嗨，我正在开始编程，我正在编写一个由网格组成的程序，当按下单个方块时会改变颜色。我想知道如何实现一个允许我输入数字的 JTextField，这反过来会创建一个该数字的方形网格（例如，如果我输入 10，我将得到一个 10x10 的网格......）
这些都是我的画布和画布面板类：
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class CanvasPanel extends JFrame implements ActionListener{
private JPanel buttonPanel;
private JButton sizeButton, clearButton, keepButton, saveButton;
private JTextField sizeText, saveText;
private Canvas canvas;
Thread runningThread;
/**
* constructor - builds buttons and board (in an instance of NewCanvas)
*/
public CanvasPanel() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("The Game of Life");
//buttons
buttonPanel=new JPanel();
sizeText = new JTextField();
sizeButton = new JButton("size");
clearButton = new JButton("clear");
keepButton = new JButton("keep");
saveText = new JTextField();
saveButton = new JButton("save");
buttonPanel.setLayout(new GridLayout(1,4));
buttonPanel.add(sizeText);
buttonPanel.add(sizeButton);
buttonPanel.add(clearButton);
buttonPanel.add(keepButton);
buttonPanel.add(saveText);
buttonPanel.add(saveButton);
sizeButton.addActionListener(this);
clearButton.addActionListener(this);
keepButton.addActionListener(this);
saveButton.addActionListener(this);
setLayout(new BorderLayout());
add(buttonPanel, BorderLayout.NORTH);
//board
canvas=new Canvas("click to give life to a square");
canvas.setBorder(BorderFactory.createLineBorder(Color.black,6));
add(canvas, BorderLayout.CENTER);
//ready to go
setSize(500,500); setVisible(true);
}
/**
* This object is its own Listener so respond to button presses
*/
public void actionPerformed(ActionEvent e){
if (e.getSource()==sizeButton)
canvas.step();
if (e.getSource()==clearButton)
canvas.clear();
if (e.getSource()==keepButton){
runningThread=new Thread(canvas);//start LifeCanvas in own thread
runningThread.start(); }
if (e.getSource()==saveButton){
canvas.stopit(); }
}
}
.
import java.awt.*; import javax.swing.*;
import java.awt.event.*;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* This class displays the game of Life using SWing
*/
public class Canvas extends JPanel implements MouseListener,Runnable{
private String status;
private boolean keepGoing;
private Grid board;
private static final int ROWS = 10;
private static final int COLUMNS = 10;
/**
* constructor builds the LifeCanvas and creates Model
*/
public Canvas(String initstring) {
status=initstring;
setBackground(Color.white);
board=new Grid(ROWS, COLUMNS);
this.addMouseListener(this);
}
/**
* paints the Canvas - calls drawgris()
*/
public void paintComponent(Graphics g) {
super.paintComponent(g);
drawgrid(g); g.drawString(status,70, 20);
}
/**
* the actual drawing
*/
public void drawgrid(Graphics g) {
int i,j,starti=40,startj=40;
g.setColor(Color.blue);
for (i=0; i<ROWS; i++)
for (j=0; j<COLUMNS; j++)
if (!board.isAlive(i+1,j+1))
g.drawRect(starti+i*20,startj+j*20,18,18);
else
g.fillRect(starti+i*20,startj+j*20,18,18);
}
/**
* this method could be improved a lot with a calculation
*/
public void mouseClicked(MouseEvent e) {
int i,j,starti=40,startj=40;
int x=e.getX(); int y=e.getY();
for (i=0; i<ROWS; i++)
for (j=0; j<COLUMNS; j++)
if ( x > starti+i*20 && x < starti+i*20+18 &&
y > startj+j*20 && y < startj+j*20+18){
board.setValue(i+1, j+1, true);
}
this.repaint();
}
/**
* one step
*/
public void step() {
status="performed a step";
board.calc();
board.copy();
repaint();
}
/**
* clears board
*/
public void clear() {
board.clear();
repaint();
}
/**
* keepsgoing until stopped
*/
public void run(){
int i=0;
status="1 iteration" ;
keepGoing=true;
try{
while (keepGoing) {
board.calc();
if (!board.hasChanged())
{status="stable in "+i+" moves"; repaint(); break;}
if (i==100)
{status="100 generations and still changing";repaint();break;}
board.copy();
i++;
status=i+" iterations"; //need slow down here
Thread.sleep(200);
repaint();
}
}
catch (InterruptedException e) {}
}
/**
* stop loop
*/
public void stopit(){
keepGoing=false;
status="stopped";
}
public void writeSerializable(String path) throws IOException {
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(path));
oos.writeObject(this);
oos.close();
}
public static Canvas readSerializable(String path) throws IOException{
Canvas result = null;
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(path));
try{
result = (Canvas)ois.readObject();
}
catch(ClassNotFoundException cnf){
throw new IOException ("problem loading serializable file "+path);
}
return result;
}
public void mouseReleased( MouseEvent e) { }
public void mousePressed( MouseEvent e) {}
public void mouseEntered( MouseEvent e) {}
public void mouseExited( MouseEvent e){}
}