四舍五入

	public static void main(String[] args) {
		float a = 30.58f;
		float b = 7.45f;
		System.out.println(a / b);

		
		String c = new DecimalFormat("###,###,###.##").format(100.126);
		//float d = Float.parseFloat(c);		System.out.print(c);
	}