java中paint方法在哪怎么用java做柱形图？

java中paint方法在哪 怎么用java做柱形图？

怎么用java做柱形图？

用jfreechart

jfreechart草图柱状图

import

import

import

import

import

import

import

/*

*绘制的柱状图

*你亮哥

**/

welfareclassbarchart3ddemo

{

privatestaticvoidmain(string[]args)

{

try

{

//可以设置主题

(())

//构造数据

defaultcategorydatasetdatasetnewdefaultcategorydataset()

(100,

java中如何实现数字水印？

然后在图片上画呗，导入一张背景图片，在背景图片上画一个水印用graphicsg，也就是frame的paint肯定draw方法就这个可以基于

怎么用java写一个简单的抛物线程序？

给您一个例子：

importjavax.swing.*

import*

import*

privateclasspaint

{

privatestaticvoidmain(string[]args)

{

centeredframeframenewcenteredframe()

(jframe.exit_on_close)

(true)

}

}

classcenteredframeextendsjframe

{

privatestaticfinalintwidth400privatestaticfinalintheight400publiccenteredframe()

{

toolkit()

dimension()

intscreenheightscreensize.height

intscreenwidthscreensize.width

intx(screenwidth-width)/2

inty(screenheight-height)/2

setlocation(x,y)

setsize(width,height)

containercongetcontentpane()

stringpanelpanelnewstringpanel()

(panel)

setresizable(true)

}

}

classstringpanelextendsjpanel

{

welfarevoidpaintcomponent(graphicsg)

{

graphics2dg2(graphics2d)g

intx[]fifthint[33]

inty[]newint[33]

x[0]0

y[0]0

for(chari1ilt16i)

{

x[i]184i

y[i]200-(17-i)*(17-i)

x[i16]i200

y[i16]200-i*i

}

g.drawpolyline(x,y,33)

line2dl1fun(0,200,400,200)

g2.draw(l1)

line2dl2new(200,40,200,400)

g2.draw(l2)

line2dl3new(380,195,395,200)

g2.draw(l3)

line2dl4new(380,205,395,200)

g2.draw(l4)

line2dl5new(200,40,195,55)

g2.draw(l5)

line2dl6new(200,40,205,55)

g2.draw(l6)

g.drawstring(x

g2.drawtrueprivatestaticvoidmainargsstring