public class formattest {
double format = 0.666666;
/**
* 保留两位小数，并四舍五入
*/
public void format1() {
BigDecimal bg = new BigDecimal(format);
double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
System.out.println(f1);
}
/**
*
* 最简单
*/
public void format2() {
DecimalFormat df = new DecimalFormat("#.00");
System.out.println(df.format(format));
}
/**
* * String.format打印最简便
*
*/
public void format3() {
System.out.println(String.format("%.2f", format));
}
public void format4() {
NumberFormat nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
System.out.println(nf.format(format));
}
public static void main(String[] args) {
formattest f = new formattest();
f.format1();
f.format2();
f.format3();
f.format4();
}
}
