BigDecimal处理四舍五入


import java.math.BigDecimal;

public class Test {

public static void main(String args[]) {
Test test = new Test();
double hehe=test.toDouble2(10000.0*1000000000/(1220.0*2440.0*3.0));
System.out.println(hehe);
}

public double toDouble2(double dou) {
System.out.println(dou);
BigDecimal bd = new BigDecimal(dou);
System.out.println(bd);
BigDecimal bd1 = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
System.out.println(bd1);
dou = bd1.doubleValue();
return dou;
}

}

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