double型怎样保留两位小数

[frogandfish]

从数据库中取的double型,在界面上要显示为保留两位小数形式,怎样写?

[mofeir]

要String得话，可以用NumberFormat
public class Test {

public static void main(String[] args) {
float[] float_args = {12345.26f, 1234.22f, 123.22f, 0.123456789f};
for (int i = 0; i < float_args.length; i++) {
System.out.println(floatFormat(float_args[i]));
}

double[] double_args = {12345.26d, 1234.22d, 123.22d, 0.123456789d};
for (int i = 0; i < double_args.length; i++) {
System.out.println(doubleFormat(double_args[i]));
}

}

public static String floatFormat(float f) {
DecimalFormat df = new DecimalFormat("0.#");
return df.format(f);
}

public static String doubleFormat(double d) {
DecimalFormat df = new DecimalFormat("0.##");
return df.format(d);
}
}

还是要double的话
如下
double dC = 1000.2356;
dC=(double)Math.round(dC*100)/100;
System.out.print(dC);