如何用Java将float转换为int

使用Math.round()将浮点数舍入为最接近的整数。

• 整数(与给定浮点数最接近的整数)

  i = Math.round(f);
  f =  2.0 -> i =  2 ; f =  2.22 -> i =  2 ; f =  2.68 -> i =  3
  f = -2.0 -> i = -2 ; f = -2.22 -> i = -2 ; f = -2.68 -> i = -3
  

  注意:根据契约，这等于(int) Math.floor(f + 0.5f)

• 截断(即删除小数点后的所有内容)

  i = (int) f;
  f =  2.0 -> i =  2 ; f =  2.22 -> i =  2 ; f =  2.68 -> i =  2
  f = -2.0 -> i = -2 ; f = -2.22 -> i = -2 ; f = -2.68 -> i = -2
  

• ceil/floor (an integer always bigger/smaller than a given value if it has any fractional part)

  i = (int) Math.ceil(f);
  f =  2.0 -> i =  2 ; f =  2.22 -> i =  3 ; f =  2.68 -> i =  3
  f = -2.0 -> i = -2 ; f = -2.22 -> i = -2 ; f = -2.68 -> i = -2
  
  
  i = (int) Math.floor(f);
  f =  2.0 -> i =  2 ; f =  2.22 -> i =  2 ; f =  2.68 -> i =  2
  f = -2.0 -> i = -2 ; f = -2.22 -> i = -3 ; f = -2.68 -> i = -3
  

For rounding positive values, you can also just use (int)(f + 0.5), which works exactly as Math.Round in those cases (as per doc).

You can also use Math.rint(f) to do the rounding to the nearest even integer; it's arguably useful if you expect to deal with a lot of floats with fractional part strictly equal to .5 (note the possible IEEE rounding issues), and want to keep the average of the set in place; you'll introduce another bias, where even numbers will be more common than odd, though.

See

http://mindprod.com/jgloss/round.html

http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html

for more information and some examples.

Math.round(value)将值舍入到最接近的整数。

使用

1) b=(int)(Math.round(a));


2) a=Math.round(a);
b=(int)a;

使用Math.round(value)，然后在类型转换为整数。

float a = 8.61f;
int b = (int)Math.round(a);

数学。Round还返回一个整数值，因此不需要类型转换。

int b = Math.round(float a);

对我来说，更简单:(int) (a +.5) // a是一个浮点数。返回四舍五入的值。

不依赖于Java Math.round()类型

如果您想将浮点值转换为整数值，有几种方法可以实现，这取决于您想如何四舍五入浮点值。

第一种方法是浮点值的舍入:

float myFloat = 3.14f;
int myInteger = (int)myFloat;

这段代码的输出将是3，即使myFloat值更接近4。

第二种方法是浮点值的四舍五入:

float myFloat = 3.14f;
int myInteger = Math.ceil(myFloat);

这段代码的输出将是4，因为舍入模式总是在寻找最大值。

Math.round()就足够了

int b = Math.round(a)

这样就可以了

通过向构造函数传递float原语来实例化Float对象，然后使用您创建的Float对象返回int原语。

Float mFloat = Float.valueOf(8.65f);
int i = mFloat.intValue();