Java 将双值格式设置为货币

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import java.text.NumberFormat;

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public class Main {

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  public static void main(String[] args) {

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    NumberFormat cf = NumberFormat.getCurrencyInstance();

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    double myAllowance = 5.00;

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    cf = NumberFormat.getCurrencyInstance();

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    System.out.println("My allowance: " + cf.format(myAllowance));

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    double costOfPaintBallGun = 12.34;

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    cf = NumberFormat.getCurrencyInstance();

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