Java equals () & = =

The similarities and differences between equals () & = = In Java can be obtained by flipping through the JDK source Java.lang.String.equals (Object anobject) to obtain a perceptual knowledge:

1 /**2 * Compares this string to the specified object. The result is {@code3 * true} if and only if the argument are not {@codenull} and is a {@code4 * String} object that represents the same sequence of characters as this5 * object.6      *7      * @paramAnObject8 * The object to compare this {@codeString} against9      *Ten      * @return  {@codetrue} If the given object represents a {@codeString} One * Equivalent to this string, {@codefalse} otherwise A      * -      * @see#compareTo (String) -      * @see#equalsIgnoreCase (String) the      */ -      Public Booleanequals (Object anobject) { -      if( This==anobject) { -          return true ; +      } -      if(AnObjectinstanceofString) { +String anotherstring =(String) anobject; A          intn =count; at          if(n = =anotherstring.count) { -            CharV1[] =value; -            CharV2[] =Anotherstring.value; -            inti =offset; -            intj =Anotherstring.offset; -             while(n--! = 0) { in               if(v1[i++]! = v2[j++]) -                return false ; to           } +            return true ; -          } the      } *      return false; $}

From the above you can see the case where the java.lang.String.equals (Object AnObject) method returns true:

1. Compare yourself with yourself;
2. Two objects are string and the contents are the same.

To be aware of:

1. Java does not support operator overloading (Operator overloading);
2. In Java, Equals () and hashcode () are closely related, and the two methods are rewritten (overriding), so the specific meaning of equals () depends on the code implementation.

Java equals () & = =