Java里如何做到一个变量成为共享数据

可以通过这个类的全局变量和定义一个减法的方法来实现呀.

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按你说的例子我们可以这么写

首先,定义一个要被共享变量的类:

public class Share {

static int a = 100;// 定义一个值为100的静态全局变量

public static void minus(int value){//定义一个静态方法

a = a -value;

}

}

创建一个测试类

public class Test {

public static void main (String[] args){

Share.minus(10); //比如我们要给上面的a变量减10

System.out.println(Share.a);//输出之前定义的变量的结果为:90

}

}

JAVA中怎么让两个类共享数据？

你可以这样，在A类中定义一个C类的引用：\x0d\x0aClass A{\x0d\x0a private C c = null;\x0d\x0a public C getC(){\x0d\x0a return this.c;\x0d\x0a }\x0d\x0a public void setC(C cc){\x0d\x0a this.c = cc;\x0d\x0a }\x0d\x0a}\x0d\x0a然后A a = new A();\x0d\x0aa.getC();就可以得到C类的实例了。

java中Thread类与Runnable接口实现资源共享的疑问

public

class

ThreadNotShare

extends

Thread{

private

int

share

=

5;

public

void

run(){

for(int

i

=

;

i

50

;

i++)

if(this.share

0){

System.out.println("shar

=

"

+

this.share--);

}

}

public

static

void

main(String

args[])

{

ThreadNotShare

t1

=

new

ThreadNotShare();

ThreadNotShare

t2

=

new

ThreadNotShare();

ThreadNotShare

t3

=

new

ThreadNotShare();

t1.start();

t2.start();

t3.start();

}

}

上面是一个继承Thread之后,因为由一个线程类分别构造了3个对象,所以各自有各自的数据,对象之间是数据不共享的

至于楼主的问题

例二表面看是继承了一个Thread类,但是调用的方法依旧是把一个线程类的对象交给Thread去构造,和实现Runnable接口在本质上没有任何区别不是吗,都是由一个对象构造出的线程,当然是共享同一份数据了

在Java中，库代码共享是什么意思？有什么含义？

库代码共享就是将多个开发人员的代码集合使用，及时更新。比如A人员负责登陆模块，B负责验证码模块，库代码共享可以将A和B所做的模块进行整合。同时又可以分工合作

求Java做的共享画板代码

function table1(stat_array,table_left,table_top,all_width,all_height,table_title,X_unit,Y_unit)

dim bg_color(10)

bg_color(1)="#ff1919"

bg_color(2)="#ffff19"

bg_color(3)="#1919ff"

bg_color(4)="#19ff19"

bg_color(5)="#fc0"

bg_color(6)="#3cc"

bg_color(7)="#ff19ff"

bg_color(8)="#993300"

bg_color(9)="#f60"

bg_color(10)="#ff8c19"

if X_unit "" then

X_unit = X_unit

end if

if Y_unit "" then

Y_unit = Y_unit

end if

num1 = ubound(stat_array,1)

line_temp=split(stat_array(0,1),",")

num2 = ubound(line_temp,1)+1

dim line_code

redim line_code(num1,num2)

for j=1 to num2

line_code(0,j) = line_temp(j-1)

next

for i=1 to num1

line_temp = split(stat_array(i,1),",")

line_code(i,0) = stat_array(i,2)

for j=1 to num2

line_code(i,j) = cdbl(line_temp(j-1))

next

next

value_Max=0

for i=1 to num1

for j=1 to num2

if value_Maxline_code(i,j) then value_Max=line_code(i,j)

next

next

value_Max = cint(value_Max)

value_Max_str =cstr(value_Max)

if value_Max9 then

temp=mid(value_Max_str,2,1)

if temp4 then

temp2=(int(value_Max/(10^(len(value_Max_str)-1)))+1)*10^(len(value_Max_str)-1)

else

temp2=(int(value_Max/(10^(len(value_Max_str)-1)))+0.5)*10^(len(value_Max_str)-1)

end if

else

if value_Max4 then temp2=10 else temp2=5

end if

item_hight = temp2/5

item_width = 20000/(num2-1)

response.Write "v:rect id='background' style='position:absolute;left:"table_left"px;top:"table_top"px;WIDTH:"all_width"px;HEIGHT:"all_height"px;' fillcolor='#EFEFEF' strokecolor='gray'"

response.Write " v:shadow on='t' type='single' color='silver' offset='4pt,4pt'/"

response.Write "/v:rect"

response.Write "v:group ID='table' style='position:absolute;left:"table_left"px;top:"table_top"px;WIDTH:"all_width"px;HEIGHT:"all_height"px;' coordsize = '27500,12800'"

response.Write " v:Rect style='position:relative;left:1500;top:200;width:23000;height:800'filled='false' stroked='f'"

response.Write " v:TextBox inset='0pt,0pt,0pt,0pt'"

response.Write " table width='100%' border='0' align='center' cellspacing='0'"

response.Write " tr"

response.Write " td align='center' valign='middle'div style='font-size:15pt; font-family:黑体;'B"table_title"/B/div/td"

response.Write " /tr"

response.Write " /table"

response.Write " /v:TextBox"

response.Write " /v:Rect "

response.Write " v:rect id='back' style='position:relative;left:1700;top:1200;width:20500; height:10500;' fillcolor='#9cf' strokecolor='#DFDFDF'"

response.Write " v:fill rotate='t' angle='-45' focus='100%' type='gradient'/"

response.Write " /v:rect"

response.Write " v:rect id='back2' style='position:relative;left:23000;top:1200;width:4000; height:"(10500)";' fillcolor='#9cf' stroked='t' strokecolor='#0099ff'"

response.Write " v:fill rotate='t' angle='-175' focus='100%' type='gradient'/"

response.Write " v:shadow on='t' type='single' color='silver' offset='3pt,3pt'/"

response.Write " /v:rect"

for i=1 to num1

if i=1 then

displaystr=""

else

displaystr="none"

end if

response.Write " div style='cursor:hand;' onmouseover='moveon(rec"i",line_"i")' onmouseout='moveout(rec"i",line_"i","i")' onclick='clickit("i")'"

response.Write " v:Rect id='rec"i"' style='position:relative;left:23100;top:"(i-1)*10200/10+1450";width:3800;height:800;display:"displaystr";' fillcolor='#efefef' strokecolor='"bg_color(i)"'"

response.Write " v:fill opacity='.6' color2='fill darken(118)' o:opacity2='.6' rotate='t' method='linear sigma' focus='100%' type='gradient'/"

response.Write " /v:Rect"

response.Write " v:Rect style='position:relative;left:23200;top:"(i-1)*10200/10+1500";width:600;height:700' fillcolor='"bg_color(i)"' stroked='f'/"

response.Write " v:Rect style='position:relative;left:24000;top:"(i-1)*10200/10+1500";width:3400;height:700' filled='f' stroked='f'"

response.Write " v:TextBox inset='0pt,4pt,0pt,0pt' style='font-size:9pt;'div align='left'"stat_array(i,2)"/div/v:TextBox"

response.Write " /v:Rect "

response.Write " /div "

next

response.Write " v:line ID='X' from='1700,11700' to='22700,11700' style='z-index:2' strokecolor='#000000' strokeWeight=1ptv:stroke EndArrow='Classic'//v:line"

response.Write " v:line ID='Y' from='1700,900' to='1700,11700' style='z-index:2' strokecolor='#000000' strokeWeight=1ptv:stroke StartArrow='Classic'//v:line"

response.Write " v:Rect style='position:relative;left:100;top:700;width:1500;height:500' filled='false' stroked='false'"

response.Write " v:TextBox inset='0pt,0pt,0pt,0pt' style='font-size:9pt;'div align='right'"Y_unit"/div/v:TextBox"

response.Write " /v:Rect "

response.Write " v:Rect style='position:relative;left:22200;top:11900;width:2000;height:500' filled='false' stroked='false'"

response.Write " v:TextBox inset='0pt,0pt,0pt,0pt' style='font-size:9pt;'div align='left'"X_unit"/div/v:TextBox"

response.Write " /v:Rect "

for i=0 to 4

response.Write " v:line from='1300,"i*2000+1700"' to='1700,"i*2000+1700"' style='z-index:2' strokecolor='#000000'/v:line"

response.Write " v:line from='1700,"i*2000+1700"' to='2200,"i*2000+1200"' style='z-index:2' strokecolor='#0099FF'/v:line"

response.Write " v:line from='2200,"i*2000+1200"' to='22200,"i*2000+1200"' style='z-index:2' strokecolor='#0099FF'/v:line"

response.Write " v:line from='2200,"i*2000+2200"' to='22200,"i*2000+2200"' style='z-index:2' strokecolor='#0099FF'"

response.Write " v:stroke dashstyle='Dot'/"

response.Write " /v:line"

response.Write " v:Rect style='position:relative;left:100;top:"i*2000+1250";width:1500;height:500' filled='false' stroked='false'"

response.Write " v:TextBox inset='0pt,0pt,0pt,0pt' style='font-size:9pt;'div align='right'"item_hight*(5-i)"/div/v:TextBox"

response.Write " /v:Rect "

next

response.Write " v:line from='2200,11200' to='22200,11200' style='z-index:2' strokecolor='#0099FF'/v:line"

response.Write " v:line from='2200,1200' to='2200,11200' style='z-index:2' strokecolor='#0099FF'/v:line"

response.Write " v:line from='1700,11700' to='2200,11200' style='z-index:2' strokecolor='#0099FF'/v:line"

for j=0 to num2-1

response.Write " v:line from='"j*item_width+1700",11700' to='"j*item_width+1700",12000' style='z-index:2' strokecolor='#000000'/v:line"

response.Write " v:line from='"j*item_width+1700",11700' to='"j*item_width+2200",11200' style='z-index:2' strokecolor='#0099FF'v:stroke dashstyle='ShortDot'//v:line"

response.Write " v:line from='"j*item_width+2200",1200' to='"j*item_width+2200",11200' style='z-index:2' strokecolor='#0099FF'v:stroke dashstyle='ShortDot'//v:line"

response.Write " v:Rect style='position:relative;left:"j*item_width+1700-item_width/2";top:12100;width:"item_width";height:500' filled='false' stroked='false'"

response.Write " v:TextBox inset='0pt,0pt,0pt,0pt' style='font-size:9pt;'div align='center'"line_code(0,j+1)"/div/v:TextBox"

response.Write " /v:Rect "

next

for i=1 to num1

if i=1 then

displaystr=""

else

displaystr="none"

end if

response.Write " div id='line_"i"' style='display:"displaystr";'"

for j=0 to num2-2

this_hight1 = cint(line_code(i,j+1)/(5*item_hight)*10000)

this_hight2 = cint(line_code(i,j+2)/(5*item_hight)*10000)

response.Write " v:line from='"j*item_width+1850","(10000-this_hight1+1550)"' to='"(j+1)*item_width+1850","(10000-this_hight2+1550)"'style='z-index:"i*10";' strokeweight='0.1pt' strokecolor='"bg_color(i)"'"

response.Write " o:extrusion v:ext='view' backdepth='12pt' on='t' lightposition='-50000,-50000' lightposition2='50000'/"

response.Write " /v:line"

next

response.Write " /div"

next

response.Write "/v:group"

end function

%

html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"

meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /

head

title/title

STYLE

v\:* { Behavior: url(#default#VML) }

o\:* { behavior: url(#default#VML) }

/STYLE

SCRIPT LANGUAGE="JavaScript"

!--

var showit = new Array(10);

function moveon(iteam,lineit){

temp=eval(iteam)

templine=eval(lineit)

if(showit[1]){

rec1.style.display = "";

line_1.style.display = "";

}else{

rec1.style.display = "none";

line_1.style.display = "none";

}

temp.style.display = "";

templine.style.display = "";

}

function moveout(iteam,lineit,i){

temp=eval(iteam)

templine=eval(lineit)

if (showit[i]){

temp.style.display = "";

templine.style.display = "";

}else{

temp.style.display = "none";

templine.style.display = "none";

}

}

function clickit(i){

if (showit[i]){

showit[i]=false

}else{

showit[i]=true

}

}

--

/script

/head

body

%

dim total(10,2)

total(0,1)="1月,2月,3月,4月,5月,6月,7月,8月,9月,10月,11月,12月"

total(1,1)="200,158,982,0,369,100,595,895,652,25,245,951"

total(2,1)="984,58,495,36,158,486,952,258,653,415,485,14"

total(3,1)="850,988,958,145,369,745,265,158,856,145,425,352"

total(4,1)="600,525,235,485,258,265,158,365,35,148,658,475"

total(5,1)="62,525,635,215,0,465,258,305,66,547,54,148"

total(6,1)="560,625,645,329,158,665,358,95,120,358,42,253"

total(7,1)="950,725,635,435,258,865,458,955,152,845,425,421"

total(8,1)="600,825,155,455,458,265,558,365,352,245,853,122"

total(9,1)="360,925,215,545,658,465,658,845,400,421,541,125"

total(10,1)="50,225,355,655,858,665,758,35,584,214,54,651"

total(1,2)="项目1"

total(2,2)="项目2"

total(3,2)="项目3"

total(4,2)="项目4"

total(5,2)="项目5"

total(6,2)="项目6"

total(7,2)="项目7"

total(8,2)="项目8"

total(9,2)="项目9"

total(10,2)="项目10"

call table1(total,50,50,700,350,"曲 线 统 计 图","时间","元")

%

/body

/html

Java如何在几个Java文件中共享数据

java实现共享数据可以将这些要共享的数据封装到一个类里并且用静态static修饰，当其他类要使用这些变量时，只需用这个类的类名.变量名即可。

事例代码如下：

变量类：

public class Demo1 {

public static int a = 1;

public static int b = 2;

public static int c = 3;

}

使用变量的类：

public class Demo2 {

public static void main(String[] args) {

System.out.println(Demo1.a);

System.out.println(Demo1.b);

System.out.println(Demo1.c);

}

}

这里使用static的好处是变量经过static的修饰，在使用这些变量时不用再创建这个类出来，只需使用类名.变量名即可使用，节省了空间；还有需要注意的是变量名需要用public来修饰，保证再不同包下的类也能使用该类下的变量。

分享名称：Java共享代码 java代码分享
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