怎么用java做柱形圖？用jfreechartjfreechart草圖柱狀圖importimportimportimportimportimportimport/**繪制的柱狀圖*你亮哥**/welf

怎么用java做柱形圖？

用jfreechart

jfreechart草圖柱狀圖

import

import

import

import

import

import

import

/*

*繪制的柱狀圖

*你亮哥

**/

welfareclassBarChart3DDemo

{

privatestaticvoidmain(String[]args)

{

try

{

//可以設(shè)置主題

(())

//構(gòu)造數(shù)據(jù)

DefaultCategoryDataset dataset new DefaultCategoryDataset()

(100,

Java中如何實現(xiàn)數(shù)字水??？

然后在圖片上畫唄，導入一張背景圖片，在背景圖片上畫一個水印用graphicsg，也就是frame的paint肯定draw方法就這個可以基于

怎么用java寫一個簡單的拋物線程序？

給您一個例子：

importjavax.swing.*

import*

import*

privateclasspaint

{

privatestaticvoidmain(String[]args)

{

CenteredFrame framenew CenteredFrame()

(JFrame.EXIT_ON_close)

(true)

}

}

classCenteredFrameextendsJFrame

{

privatestaticfinalintWIDTH400private static final int HEIGHT400public CenteredFrame()

{

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

int x[]fifthint[33]

int y[]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