如何将double格式化为字符串,并在必要时仅显示十进制数字？

import java.text.DecimalFormat;

public class FormatDouble {
    public static void main(String[] args) {
        double number = 12345.6789;
        DecimalFormat decimalFormat = new DecimalFormat("#.##");
        String formattedNumber = decimalFormat.format(number);
        System.out.println(formattedNumber);
    }
}

public class FormatDouble {
    public static void main(String[] args) {
        double number = 12345.6789;
        String formattedNumber = String.format("%.2f", number);
        System.out.println(formattedNumber);
    }
}

public class FormatDouble {
    public static void main(String[] args) {
        double number = 12345.6789;
        System.out.printf("%.2f", number);
    }
}