Java equals function usage

The equals function has been defined in the base class object. The source code is as follows: Copy codeThe Code is as follows: public boolean equals (Object obj ){
Return (this = obj );
}

From the source code, we can see that the default equals () method is the same as "=", and both are reference of comparative objects, rather than object values (equals () in common sense () the comparison for objects is relative because most classes in java have rewritten the equals () method. The following is an example of the String class. The source code of the String equals () method is as follows :)
[Java]Copy codeThe Code is as follows:/** The value is used for character storage .*/
Private final char value [];

/** The offset is the first index of the storage that is used .*/
Private final int offset;

/** The count is the number of characters in the String .*/
Private final int count;

[Java] view plaincopyprint?
Public boolean equals (Object anObject ){
If (this = anObject ){
Return true;
}
If (anObject instanceof String ){
String anotherString = (String) anObject;
Int n = count;
If (n = anotherString. count ){
Char v1 [] = value;
Char v2 [] = anotherString. value;
Int I = offset;
Int j = anotherString. offset;
While (n --! = 0 ){
If (v1 [I ++]! = V2 [j ++])
Return false;
}
Return true;
}
} // Www. software8.co
Return false;
}

The equals () of the String class is very simple. It only converts the String class to a character array for comparison by bit.
In summary, we should note the following when using the equals () method:
1. If equals () applies a custom object, you must overwrite the system's equals () method in the Custom class.
2. Little knowledge, great trouble.