奇怪的 toCharArray() 行为

2022-01-12 00:00:00 arrays char java

我在试验 toCharArray() 并发现了一些奇怪的行为.

I was experimenting with toCharArray() and found some strange behavior.

假设 private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();

 System.out.println(HEX_CHARS);

  /* prints 0123456789abcdef */

 System.out.println("this is HEX_CHARS "+HEX_CHARS); 
  /* prints [C@19821f */

这背后有什么理论上的原因吗?

Any theoretical reason behind this?

推荐答案

这是因为两次调用中println的参数不同.

It is because the parameter to println is different in the two calls.

第一个参数用 char[] 调用，第二个参数用字符串调用，其中 HEX_CHARS 通过调用 .toString() 进行转换.

The first parameter is called with char[] and the second is called with a string, where HEX_CHARS is converted with a call to .toString().

println() 有一个接受 charArray 的重写方法.

The println() have an overriden method that accepts a charArray.

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