How do I compare strings in Java?
1. 语法知识
==：判断的是引用的相等性（reference equality），也即是否为同一对象；.equals()：判断的是值的相等性（value equality），也即是否在逻辑上相等；
2. 举例
- new String(“test”).equals(“test”) // –> true
- // These two have the same value
- new String(“test”) == “test” // –> false
- // … but they are not the same object
- new String(“test”) == new String(“test”) // –> false
- “test” == “test” // –> true
- literals are interned by the compiler and thus refer to the same object
- Objects.equals(“test”, new String(“test”)) // –> true
- Objects.equals(null, “test”) // –> false
- // … but you should really just call Objects.equals()
