Insert string in beginning of another string

Question

How to insert a string enclosed with double quotes in the beginning of the StringBuilder and String   Eg   StringBuilder  sb   new StringBuilder  Sam      I need to insert the string  Hello  to the beginning of  Sam  and O p is  Hello Sam    String  s    Jam     I need to insert the string  Hello  to the beginning of  Jam  and O p is  Hello Jam    How to achieve this

User · Accepted Answer

The first case is done using the insert   method    sb insert 0   Hello       The latter case can be done using the overloaded   operator on Strings  This uses a StringBuilder behind the scenes   String s2    Hello      s

User · Answer

It is better if you find quotation marks by using the indexof   method and then add a string behind that index   string s  hai   int s s indexof

User · Answer

Other answers explain how to insert a string at the beginning of another String or StringBuilder  or StringBuffer      However  strictly speaking  you cannot insert a string into the beginning of another one   Strings in Java are immutable1   When you write   String s    Jam   s    Hello     s    you are actually causing a new String object to be created that is the concatenation of  Hello   and  Jam    You are not actually inserting characters into an existing String object at all     1 - It is technically possible to use reflection to break abstraction on String objects and mutate them     even though they are immutable by design   But it is a really bad idea to do this   Unless you know that a String object was created explicitly via new String      it could be shared  or it could share internal state with other String objects   Finally  the JVM spec clearly states that the behavior of code that uses reflection to change a final is undefined   Mutation of String objects is dangerous

User · Answer

Sure  use StringBuilder insert      sb insert 0   s

User · Answer

private static void appendZeroAtStart             String strObj    11           int maxLegth   5           StringBuilder sb   new StringBuilder strObj           if  sb length    lt   maxLegth                while  sb length    lt  maxLegth                    sb insert 0   0                            else               System out println  error                       System out println  result      sb

User · Answer

import java lang StringBuilder   public class Program       public static void main String   args            Create a new StringBuilder      StringBuilder builder   new StringBuilder            Loop and append values      for  int i   0  i  lt  5  i              builder append  abc                  Convert to string      String result   builder toString            Print result      System out println result

[java] Insert string in beginning of another string

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