java中画线的代码

java中在面板上怎么画直线?

方法1：

public?static?void?main(String[]?args)?{

//JPanel?p?=?new?JPanel();?注释掉这句

JFrame?frame?=?new?JFrame("DrawLine");

frame.add(new?DrawLine());//将p对象换成本类

//因为本类继承了JPanel重写paintComponent进行绘制,是绘制到本类的panel上的,

//而不是绘制到new?Panel()对象

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

//这种方式可能?让你更理解

DrawLine?dl?=?new?DrawLine();//新建对象

dl.init();//执行初始化

private?void?init(){

frame.add(this);//将p对象换成本类

java简单的画线程序

import java.awt.*;

import java.awt.event.*;

import java.util.ArrayList;public class DrawLine extends Frame

implements WindowListener

{

static ArrayList lbArray; DrawLine(){

setVisible(true);

Label lb0=new Label("Hello");

addWindowListener(this);

add(lb0);

Label lb1=new Label("World!");

add(lb1);

lbArray.add(lb0);

lbArray.add(lb1);

repaint(); }

public void windowClosed(WindowEvent w)

System.exit(0);

public void windowClosing(WindowEvent w)

dispose();

public void windowOpened(WindowEvent e) {}

public void windowIconified(WindowEvent e) {}

public void windowDeiconified(WindowEvent e) {}

public void windowActivated(WindowEvent e) {}

public void windowDeactivated(WindowEvent e) {}

public void paint(Graphics g)

super.paint(g); if(lbArray.size()=1)

g.setColor(Color.red);

Label lb=(Label)lbArray.get(0);

Rectangle rc=lb.getBounds();

for(int i=1;ilbArray.size();i++)

lb=(Label)lbArray.get(i);

rc=lb.getBounds();

} public static void main(String[] args){

lbArray=new ArrayList(10);

new DrawLine();

} 终于做了个满足你要求的东西.要知道我昨天和你说过我并不常用Java.赶快采纳吧.

java 绘图板 如何实现画直线的功能

这个简单

特意给你写了个小例子,希望能帮到你

***************************************

import javax.swing.*;

public class DrawLine extends JPanel {

public static void main(String[] args) {

JFrame frame = new JFrame("DrawLine");

frame.getContentPane().add(new DrawLine());

protected void paintComponent(Graphics g) {

****************************

将程序复制到记事本中并改名为DrawLine.java(注意大小写)

然后在命令行中用 CD＋文件夹 使命令范围到DrawLine.java的文件夹中

然后执行命令javac DrawLine.java

再执行命令java DrawLine

你会看到结果

java 如何在jpanel上画垂直线、水平线、平行线?

定义一个类继承JPanel类,重写 JPanel 的 paint 方法,使用 Graphics 绘制线段,如下代码：

import?java.awt.BorderLayout;

import?java.awt.Color;

import?java.awt.Graphics;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

class?MyPanel?extends?JPanel?{

@Override

public?void?paint(Graphics?g)?{

super.paint(g);

g.setColor(Color.RED);

for?(int?i?=?0;?i?10;?i++)?{

public?class?App?extends?JFrame?{

public?App()?{

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

MyPanel?panel?=?new?MyPanel();

this.add(panel,?BorderLayout.CENTER);

new?App().setVisible(true);

运行结果：

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