Question

创建一个java程序：按下鼠标，然后等到鼠标释放以后得到一个矩形；重复操作N次，窗口上就有N个矩形。

这是我写的代码，但是好像只能生成一个矩形。大神们，帮我看看该怎么修改程序啊

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Rectangle extends JLabel {

private int x1 = 0;
private int y1 = 0;
private int x2 = 0;
private int y2 = 0;
private boolean visit = true;

public Rectangle() {
super();
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
x1 = e.getX();
y1 = e.getY();
}
public void mouseReleased(MouseEvent e) {
x2 = e.getX();
y2 = e.getY();
visit = true;
System.out.println("坐标1："+x1+" "+y1);
System.out.println("坐标2："+x2+" "+y2);

repaint();
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
x2 = e.getX();
y2 = e.getY();
visit = false;
repaint();
}
});
}
protected void paintComponent(Graphics g) {
if (!visit)
return;
g.setColor(Color.black);

g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x1 - x2),
Math.abs(y1 - y2));

}
super.paintComponent(g);
}

protected void paintBorder(Graphics g) {

g.setColor(getForeground());
if (visit)
return;
g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x1 - x2),
Math.abs(y1 - y2));
}

public static void main(String[] args) {

JLabel rectangle = new Rectangle();

JFrame frame = new JFrame();

frame.getContentPane().add(rectangle);

frame.setSize(300, 300);
frame.setVisible(true);
}

}

Answer 1

利用集合类保存每次生成的矩形的x,y。用for循环生成集合内的对应的矩形。

追问

能具体说下该怎么创建么？（我是新手）

追答

那你可以使用数组存储存每次生成的矩形的x,y。用for循环生成数组内的对应的矩形。