JDK自带格式化方法之四舍五入

public static void main(String[] args) {
		System.out.println(String.format("%.2f",165.415413524));//165.42
		System.out.println(String.format("%.1f",165.415413524));//165.4
		System.out.println(String.format("%.0f",165.415413524));//165
	}