java 整数如何进行格式化

? Java ?,???? String.format() ??? DecimalFormat ??????????????????:

1. ?? String.format() ??:

public class FormatInteger {
    public static void main(String[] args) {
        int number = 12345;
        String formattedNumber = String.format("d", number); // ?? "00012"
        System.out.println("Formatted integer: " + formattedNumber);
    }
}

??????,d ????????,???????? 5 ??????,?????? 0 ???

2. ?? DecimalFormat ?:

import java.text.DecimalFormat;

public class FormatInteger {
    public static void main(String[] args) {
        int number = 12345;
        DecimalFormat decimalFormat = new DecimalFormat("00000");
        String formattedNumber = decimalFormat.format(number); // ?? "00012"
        System.out.println("Formatted integer: " + formattedNumber);
    }
}

??????,??????? DecimalFormat ??,?????????? "00000",???????? 5 ??????,?????? 0 ??????? format() ?????????????