如何在 Java 中将 Long 转换为 int?

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时间:2020-10-30 12:49:42  来源:igfitidea点击:

How can I cast a Long to an int in Java?

java

提问by Alex

Long x;
int y = (int) x;

Eclipse is marking this line with the error:

Eclipse 正在用错误标记这一行:

Can not cast Long to an int

不能将 Long 转换为 int

回答by Sean Patrick Floyd

Use primitive long

使用原语 long

long x = 23L;
int  y = (int) x;

You can't cast an Object (Long is an Object) to a primitive, the only exception being the corresponding primitive / wrapper type through auto (un) boxing

您不能将对象(Long 是一个对象)转换为原始类型,唯一的例外是通过自动(取消)装箱获得相应的原始类型/包装类型

If you must convert a Longto an int, use Long.intValue():

如果必须将 a 转换Long为 int,请使用Long.intValue()

Long x = 23L;
int  y = x.intValue();

But beware: you may be losing information! A Long/ longhas 64 bit and can hold much more data than an Integer/ int(32 bit only)

但请注意:您可能会丢失信息!A Long/long有 64 位并且可以容纳比Integer/多得多的数据int(仅限 32 位)

回答by Ishtar

Long xis an object.

Long x是一个对象。

int y = x.intValue();

回答by Alex

int y = (int) (long) x;

is working.

工作中。