Returns the closest {@code long} to the argument, with ties
rounding to positive infinity.
返回一个最接近的值,如果是0.5,上下距离一样,向正无穷方向取值,其实就是取较大的值。
@Test
public void testRound(){
System.out.println(Math.round(12.5)); //13
System.out.println(Math.round(-12.5)); //-12
System.out.println(Math.round(-12.6)); //-13
}