将整数乘以0.5时向上舍入

Question

有没有办法自动对java中的值进行舍入？

例如：

//generate a random integer value
int randomVal = RandomHelper.nextIntFromTo(1, otherVal);

/* then divide the integer value in half... the error I am getting is that its a double, probably 
because the number generated isn't an even number, but I NEED it to be an integer. Can I round up?*/
int value = randomVal * 0.5;

Answer 1

您可以添加1然后除以2而不是乘以0.5。这样，您可以避免浮点运算，然后转换为int。

int value = (randomVal + 1) / 2;

Answer 2

使用Math.ceil()：

int value = (int)Math.ceil(randomVal * 0.5);