Java中保留n位小数的四种方法

package CodeJava_Leet; import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.NumberFormat; /** * Created by Yechengpeng on 2016-08-14. */ public class Test { public static void main(String[] args) { double d = 756.2345566; //方法一：最简便的方法，调用DecimalFormat类 DecimalFormat df = new DecimalFormat(".00"); System.out.println(df.format(d)); //方法二：直接通过String类的format函数实现 System.out.println(String.format("%.2f", d)); //方法三：通过BigDecimal类实现 BigDecimal bg = new BigDecimal(d); double d3 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(d3); //方法四：通过NumberFormat类实现 NumberFormat nf = NumberFormat.getNumberInstance(); nf.setMaximumFractionDigits(2); System.out.println(nf.format(d)); } }

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D:\Java\jdk1.8.0\... 756.23 756.23 756.23 756.23 Process finished with exit code 0