Boolean 类的 getBoolean(String str) 和 valueOf(String str) 给出不同的输出

2022-01-19 00:00:00 boolean java

我很惊讶地知道 getBoolean() 和 valueOf() 方法对相同的输入字符串返回不同的结果.

I am surprised to know that getBoolean() and valueOf() method returns different results for the same input string.

我已尝试将 "true" 传递给这两种方法.但是 getBoolean() 给了我错误的输出，而 valueOf() 给了我正确的输出是正确的.为什么?

I have tried to pass the "true" to both the methods. But getBoolean() gives me false output whereas valueOf() gives me right output that is true. Why?

推荐答案

                                     API 文档是您的朋友.

                                     The API-documentation is your friend.

  • Boolean.getBoolean 可能不会像您认为的那样:

  • Boolean.getBoolean probably doesn't do what you think it does:

当且仅当 system由参数命名的属性存在且等于字符串true".


  • Boolean.valueOf 可能就是你要找的:

  • Boolean.valueOf is probably what you're looking for:

如果字符串参数不为空并且等于字符串true"，则返回的布尔值表示值 true.

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