How to compare two strings are equal in value what is the best method

Question

Always confused about this stuff  Anyone can help

User · Answer

checks to see if they are actually the same object in memory  which confusingly sometimes is true  since they may both be from the pool   where as equals   is overridden by java lang String to check each character to ensure true equality  So therefore  equals   is what you want

User · Answer

Not forgetting    equalsIgnoreCase String    if you re not worried about that sort of thing

User · Answer

string1 equals string2  is right way to do it   String s    something   t    maybe something else    if  s    t          Legal  but usually results WRONG   if  s equals t      RIGHT way to check the two strings         will fail in following case     String s1   new String  abc     String s2   new String  abc      if s1  s2    it will return false

User · Answer

You should use some form of the String equals Object  method  However  there is some subtlety in how you should do it   If you have a string literal then you should use it like this    Hello  equals someString     This is because the string literal  Hello  can never be null  so you will never run into a NullPointerException   If you have a string and another object then you should use   myString equals myObject     You can make sure you are actually getting string equality by doing this  For all you know  myObject could be of a class that always returns true in its equals method   Start with the object less likely to be null because this   String foo   null  String bar    hello   foo equals bar     will throw a NullPointerException  but this   String foo   null  String bar    hello   bar equals foo     will not  String equals Object  will correctly handle the case when its parameter is null  so you only need to worry about the object you are dereferencing--the first object

User · Answer

string1 equals string2  is the way   It returns true if string1 is equals to string2 in value  Else  it will return false   equals reference

User · Answer

You can either use the    operator or the Object equals Object  method   The    operator checks whether the two subjects are the same object  whereas the equals method checks for equal contents  length and characters    if objectA    objectB          objects are the same instance  i e  compare two memory addresses against each other     if objectA equals objectB           objects have the same contents  i e  compare all characters to each other      Which you choose depends on your logic - use    if you can and equals if you do not care about performance  it is quite fast anyhow    String intern   If you have two strings  you can internate them  i e  make the JVM create a String pool and returning to you the instance equal to the pool instance  by calling String intern     This means that if you have two Strings  you can call String intern   on both and then use the    operator  String intern   is however expensive  and should only be used as an optimalization - it only pays off for multiple comparisons    All in-code Strings are however already internated  so if you are not creating new Strings  you are free to use the    operator  In general  you are pretty safe  and fast  with  if objectA    objectB    objectA equals objectB          if you have a mix of the two scenarios  The inline  if objectA    null   objectB    null   objectA equals objectB          can also be quite useful  it also handles null values since String equals     checks for null

[java] How to compare two strings are equal in value, what is the best method?

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