java数组问题 本帖最后由 yanghai0321 于 2011-10-24 22:29:45 编辑 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 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? DrawLine line = new DrawLine(); frame.add(line);这两行是神马情况?? 你看一下吧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(); }} 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 cmd导入的jar包也要放进相应的路径 java多组数据 Java 接口泛型的问题 jquery.tablesorter.js 怎么控制每页显示的条数哦? 开源发布 JNSP(java network service platform)分布式服务 问个JDK环境配置问题 将工程bin文件放到其他电脑运行class时,如何处理工程用到的jar包? java 的简单问题 7 ??? 请sunjiujiu(芳芳)和xf_1999(原来如此)进来一下,我想请教WL5的问题. 如何在WINNT下安装LINUX,不重新分区可不可以? java 如何 post数组? 怎样求DataInputStream的长度 java关于时间计算
frame.add(line);
这两行是神马情况??
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();
}
}
等待