Android Face question Java Basics

1. The difference between equals and = =
1.1 For basic data types, = = Compares values for equality
1.2 For reference data types, = = Compares the object memory address is consistent, equal is a method in the object class, in which the implementation of equals only compares the memory address of two objects is equal, but in some subclasses, such as: String, Integer, etc., The method will be overridden to compare whether the content values are equal
String str1 = "abc";
String str2 = "abc";

System.out.println (str1 = = str2);
System.out.println (Str1.equals (str2));

String str2 = new String ("abc");
System.out.println (str1 = = str2);
System.out.println (Str1.equals (str2));

```
The above code will be output
True
True
False
True

Android Face question Java Basics