Java Math类 常用的方法
2015-10-15 16:02
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public class MathDemo { public static void main(String args[]){ /** * abs求绝对值 */ System.out.println(Math.abs(-10.4)); //10.4 System.out.println(Math.abs(10.1)); //10.1 /** * ceil天花板的意思,就是返回大的值,注意一些特殊值 */ System.out.println(Math.ceil(-10.1)); //-10.0 System.out.println(Math.ceil(10.7)); //11.0 System.out.println(Math.ceil(-0.7)); //-0.0 System.out.println(Math.ceil(0.0)); //0.0 System.out.println(Math.ceil(-0.0)); //-0.0 /** * floor地板的意思,就是返回小的值 */ System.out.println(Math.floor(-10.1)); //-11.0 System.out.println(Math.floor(10.7)); //10.0 System.out.println(Math.floor(-0.7)); //-1.0 System.out.println(Math.floor(0.0)); //0.0 System.out.println(Math.floor(-0.0)); //-0.0 /** * max 两个中返回大的值,min和它相反,就不举例了 */ System.out.println(Math.max(-10.1, -10)); //-10.0 System.out.println(Math.max(10.7, 10)); //10.7 System.out.println(Math.max(0.0, -0.0)); //0.0 /** * random 取得一个大于或者等于0.0小于不等于1.0的随机数 */ System.out.println(Math.random()); //0.08417657924317234 System.out.println(Math.random()); //0.43527904004403717 /** * rint 四舍五入,返回double值 * 注意.5的时候会取偶数 */ System.out.println(Math.rint(10.1)); //10.0 System.out.println(Math.rint(10.7)); //11.0 System.out.println(Math.rint(11.5)); //12.0 System.out.println(Math.rint(10.5)); //10.0 System.out.println(Math.rint(10.51)); //11.0 System.out.println(Math.rint(-10.5)); //-10.0 System.out.println(Math.rint(-11.5)); //-12.0 System.out.println(Math.rint(-10.51)); //-11.0 System.out.println(Math.rint(-10.6)); //-11.0 System.out.println(Math.rint(-10.2)); //-10.0 /** * round 四舍五入,float时返回int值,double时返回long值 */ System.out.println(Math.round(10.1)); //10 System.out.println(Math.round(10.7)); //11 System.out.println(Math.round(10.5)); //11 System.out.println(Math.round(10.51)); //11 System.out.println(Math.round(-10.5)); //-10 System.out.println(Math.round(-10.51)); //-11 System.out.println(Math.round(-10.6)); //-11 System.out.println(Math.round(-10.2)); //-10 } }
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