不删除java中大小数中的前导零

public class Main {
    public static void main(String[] args) {
        int number = 123;
        String formattedNumber = String.format("%05d", number);
        System.out.println(formattedNumber);
    }
}

import java.text.DecimalFormat;

public class Main {
    public static void main(String[] args) {
        double number = 0.123;
        DecimalFormat decimalFormat = new DecimalFormat("0.000");
        String formattedNumber = decimalFormat.format(number);
        System.out.println(formattedNumber);
    }
}