DecimalFormat保留小数

package cn.time;

import java.text.DecimalFormat;

public class JdkUtilTest {
    public static void main(String[] args) {
        DecimalFormat df = new DecimalFormat("#0.0");

        //保留2位,不足补0
        DecimalFormat df_fill_zero = new DecimalFormat("00.00");

        //保留2位,不足保留原位数
        DecimalFormat df_fill_null = new DecimalFormat("##.##");

        System.out.println(df_fill_zero.format(1.2)); //01.20  不足2位补0
        System.out.println(df_fill_null.format(1.2)); //1.2   不足2位保留原数位
        System.out.println( df.format(1.2));

        System.out.println(df_fill_zero.format(1.224)); //01.22 超出2位截断(舍入模式后面再说)
        System.out.println(df_fill_null.format(1.224)); //1.22 超出2位截断(舍入模式后面再说)
        System.out.println( df.format(1.224));

        System.out.println(df_fill_zero.format(123.22)); //123.22
        System.out.println(df_fill_null.format(123.22)); //123.22
        System.out.println( df.format(123.22));
    }
}