一下代码是用鼠标画线条，有一个缺点就是只能画10条
请问用什么方法可以实现想怎么画都可以？
（更改数组大小除外）
还有这个程序通过cmd来编译不了，但是通过Eclipse又可以编译运行出来！求原因
- Java code
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class DrawLineTest extends JPanel { static int i = 0; int x1[] = new int[10]; int x2[] = new int[10]; int y1[] = new int[10]; int y2[] = new int[10]; public static void main(String[] args) { JFrame frame = new JFrame(); Container container = frame.getContentPane(); DrawLine line = new DrawLine(); frame.add(line); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame.setTitle("DrawLineTest"); frame.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); frame.setLocation(200, 200); } public void paintComponent(Graphics g) { super.paintComponent(g); for (int i = 0; i < x1.length; i++) { g.drawLine(x1[i], y1[i], x2[i], y2[i]); } } public void DrawLine() { addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent event) { x1[i] = event.getX(); y1[i] = event.getY(); } public void mouseReleased(MouseEvent event) { Graphics g = getGraphics(); g.setColor(Color.RED); x2[i] = event.getX(); y2[i] = event.getY(); g.drawLine(x1[i], y1[i], x2[i], y2[i]); i++; } }); } public static final int DEFAULT_WIDTH = 250; public static final int DEFAULT_HEIGHT = 250;}------解决方案--------------------
单纯看你给出的代码，DrawLine这个类根本就没有定义，在eclipse里面怎么可以正常编译
你看看是不是没有给全代码？
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DrawLine line = new DrawLine();
frame.add(line);
这两行是神马情况？？
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你看一下吧
- Java code
import java.awt.Color;import java.awt.Graphics;import java.awt.HeadlessException;import java.awt.Point;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import javax.swing.JFrame;public class Draw extends JFrame { private Point oldP; private Point newP; public Draw() { this.oldP = new Point(0,0); this.newP = new Point(0,0); this.setBounds(200,50,400,300); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { oldP = getMousePosition(); } public void mouseReleased(MouseEvent e) { newP = getMousePosition(); repaint(); } }); this.setVisible(true); } public void paint(Graphics g) { Color c = g.getColor(); g.setColor(Color.red); g.drawLine(oldP.x, oldP.y, newP.x, newP.y); g.setColor(c); } public static void main(String[] args) { new Draw(); }}
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楼主的代码贴的好像不怎么全，不知道DrawLine line = new DrawLine();这个类是怎么实现的？
等待。。。。。。
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4楼 正解!
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cmd导入的jar包也要放进相应的路径