Detailed introduction to the difference between == and equals in java

== 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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