Java中的char和int

看到这段代码工作,我感到很惊讶.我认为char和int是 Java中的两种不同的数据类型,我不得不将char转换为int来为此提供ascii equivelent.为什么这样做？

String s = "hello";
int x = s.charat(1);
System.out.println(x);

解决方法

char可以自动转换为int.见 JLS 5.1.2：

The following 19 specific conversions on primitive types are called the widening primitive conversions:

…

• char to int,long,float,or double

…

A widening conversion of a signed integer value to an integral type T simply sign-extends the two’s-complement representation of the integer value to fill the wider format. A widening conversion of a char to an integral type T zero-extends the representation of the char value to fill the wider format.

(重点补充)

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