What’s the difference between ‘.equals()’ and ‘==’?
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a. == 是运算符，equals 是string 对象的方法;
b.基本类型（string除外）作比较时，都是比较两个值是否相等，返回true或者false;
c.引用对象作比较时，都是比较指向栈内存中的地址是否相等，返回true或者false;
d.对于string类型，==和equals 都是比较字符串是否相等，相同的字符串内存地址不一定相同，而相同内存地址的字符串一定是相同的。
b.基本类型（string除外）作比较时，都是比较两个值是否相等，返回true或者false;
c.引用对象作比较时，都是比较指向栈内存中的地址是否相等，返回true或者false;
d.对于string类型，==和equals 都是比较字符串是否相等，相同的字符串内存地址不一定相同，而相同内存地址的字符串一定是相同的。
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