java - Java中添加小数位(小数点后3位)

Question

我想知道如何使以下程序中的 avg 四舍五入到小数点后 3 位:

public class BaseballCalculator {
    public static void main(String args[])  {
        Scanner myScanner = new Scanner(System.in);
        double atBats;
        double baseHits;
        double onBase;
        double avg;
        double onBasePercentage;

        System.out.println("How many atbats did you have? ");
            atBats = myScanner.nextDouble();

        System.out.println("How many base hits and homeruns did you have? ");
            baseHits = myScanner.nextDouble();

        System.out.println("How many times did you get a hit by pitch or walk? ");
            onBase = myScanner.nextDouble();

        avg = baseHits / atBats;
        onBasePercentage = (baseHits + onBase) / atBats;

        System.out.println("You have a total of " + baseHits + " base hits for the season");
        System.out.println("You have a total of " + atBats + " at bats for the season");
        System.out.println("Your average for the game or season is: " + avg);
        System.out.println("Your on base percentage for the game or year is: " + onBasePercentage);
    }
}

Answer 1

使用String.format将输出格式化为小数点后 3 位。输出被舍入。

System.out.println("Your average for the game or season is: " +
    String.format("%.3f", avg));