android java 对数字处理

保留小数点1位 且舍掉后面所有

import java.math.RoundingMode;
import java.text.DecimalFormat;
public class Main {
    public static void main(String[] args) {
            DecimalFormat df = new DecimalFormat("0.0");
        double num = 11.286;
//        DecimalFormat df = new DecimalFormat("#.##");
        //指定RoundingMode
        df.setRoundingMode(RoundingMode.DOWN);
        String str = df.format(num);
        double formatNum = Double.parseDouble(str);
        System.out.println(formatNum);
    }
}

保留小数点1位 四舍五入

import java.math.RoundingMode;
import java.text.DecimalFormat;
public class Main {
    public static void main(String[] args) {
            DecimalFormat df = new DecimalFormat("0.0");
        double num = 11.286;
//        DecimalFormat df = new DecimalFormat("#.##");
        //指定RoundingMode
        df.setRoundingMode(RoundingMode.DOWN);
        String str = df.format(num);
        double formatNum = Double.parseDouble(str);
        System.out.println(formatNum);
    }
}

 

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标签：java,数字,df,DecimalFormat,formatNum,num,android,RoundingMode
来源： https://www.cnblogs.com/zhangxuetao/p/16295553.html