Java基础（2）------常量池
- 直接使用双引号声明出来的 String 对象会直接存储在常量池中。
- 使用new关键字创建String的对象不会存储在常量池中.
- 如果不是用双引号声明的 String 对象，可以使用 String 提供的 intern 方法。String.intern() 是一个 Native 方法，它的作用是:如果运行时常量池中已经包含一个等于此 String 对象内容的字符串,则返回常量池中该字符串的引用;如果没有,则在常量池中创建与此 String 内容相同的字符串，并返回常量池中创建的字符串的引用。
与intern有关的比较例子：
注意点：
- == 比较的是内存地址 , equals比较的是值
- 字符串拼接的时候：变量+变量 和 直接用字符串+字符串拼接是不一样的，前一种会创建个新的对象。
- 我们在使用字符串的时候应尽量避免多个字符串拼接，因为这样会重新创建对象。如果需要改变字符串的话，可以使用 StringBuilder 或者 StringBuffer。
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阳光星河 https://www.276227.com
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