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在java里怎么让Double类型的变量小数点后保留4位小数
谢谢拉！：）
double y=8.10085;
double x=y*10000;
x+=0.5;
int i=(int)x;
x=(double)i/10000;
http://expert.csdn.net/Expert/topic/1723/1723235.xml?temp=.5937311
http://expert.csdn.net/Expert/topic/1773/1773757.xml?temp=.1516535
http://expert.csdn.net/Expert/topic/1809/1809246.xml?temp=.9830744
http://expert.csdn.net/Expert/topic/1839/1839436.xml?temp=.6861383
http://expert.csdn.net/Expert/topic/1946/1946311.xml?temp=.4294092
...
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太多了，你自己随便挑一个
import java.text.*;
double y=8.10085;
DecimalFormat mat = new DecimalFormat("0.0000");
String n = mat.format(y);
即可
