Java uses if statement to determine whether strings are equal

String comparison in Java cannot directly use "==", but must use equals(). Return true if the two strings are equal, and return false if the two strings are not equal. For example: (Recommended learning: java video tutorial)

if (s1.equals(s2)) {
 System.out.println("s1与s2相等！！");
} else {
 System.out.println("s1与s2没啥关系！！");
}

1. String is an object type, so it cannot be judged by simple "==";

2. Equals() compares whether the contents of the objects (in the case-sensitive format of letters) are equal;

3. When "==" compares two objects, it compares the contents of the two objects. memory addresses, so they are not equal.

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