== Difference between equals:
For ==:
acts on basic data For variables of type, directly compare whether the "values" they store are equal; when
acts on variables of reference type, the address of the pointed object is compared.
For equals:
The equals method cannot be applied to variables of basic data types;
If the equals method in Object is not overridden, then What is compared is the address of the object pointed to by the reference type variable, otherwise the content is compared.
Example:
String str1 = "abc"; String str2 = "abc"; String str3 = new String("abc"); String str4 = new String("abc");
当： str1 == str2 输出：true 当：str1.equals(str2); 输出：true 当： str1 == str3 输出：false 当：str1.equals(str3); 输出：true 当： str3 == str4 输出：false 当：str3.equals(str4); 输出：true
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