Java - removing first character of a string

Question

In Java  I have a String   Jamaica   I would like to remove the first character of the string and then return amaica  How would I do this

User · Answer

you can do like this  String str    quot Jamaica quot   str   str substring 1  title length     return str   or in general  public String removeFirstChar String str      return str substring 1  title length

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You can use the substring method of the String class that takes only the beginning index and returns the substring that begins with the character at the specified index and extending to the end of the string    String str    Jamaica   str   str substring 1

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Use the substring   function with an argument of 1 to get the substring from position 1  after the first character  to the end of the string  leaving the second argument out defaults to the full length of the string     Jamaica  substring 1

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public String removeFirstChar String s      return s substring 1

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Use substring   and give the number of characters that you want to trim from front    String value    Jamaica   value   value substring 1     Answer   amaica

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In Java  remove leading character only if it is a certain character  Use the Java ternary operator to quickly check if your character is there before removing it   This strips the leading character only if it exists  if passed a blank string  return blankstring     String header       header   header startsWith        header substring 1    header  System out println header    header    foobar   header   header startsWith        header substring 1    header  System out println header    header     moobar   header   header startsWith        header substring 1    header  System out println header     Prints   blankstring foobar moobar   Java  remove all the instances of a character anywhere in a string   String a    Cool   a   a replace  o         variable  a  contains the string  Cl    Java  remove the first instance of a character anywhere in a string   String b    Cool   b   b replaceFirst  o         variable  b  contains the string  Col

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substring   method returns a new String that contains a subsequence of characters currently contained in this sequence  The substring begins at the specified start and extends to the character at index end - 1  It has two forms  The first is  String substring int FirstIndex    Here  FirstIndex specifies the index at which the substring will begin  This form returns a copy of the substring that begins at FirstIndex and runs to the end of the invoking string    String substring int FirstIndex  int endIndex    Here  FirstIndex specifies the beginning index  and endIndex specifies the stopping point  The string returned contains all the characters from the beginning index  up to  but not including  the ending index   Example    String str    quot Amiyo quot         prints substring from index 3    System out println  quot substring is    quot    str substring 3       Output  yo

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Another solution  you can solve your problem using replaceAll with some regex    1   regex demo  for example    String str    Jamaica   int nbr   1  str   str replaceAll         nbr              Output   amaica

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public String removeFirst String input        return input substring 1

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My version of removing leading chars  one or multiple  For example  String str1    01234   when removing leading  0   result will be  1234   For a String str2    000123  result will be again  123   And for String str3    000  result will be empty string      Such functionality is often useful when converting numeric strings into numbers The advantage of this solution compared with regex  replaceAll       is that this one is much faster  This is important when processing large number of Strings    public static String removeLeadingChar String str  char ch        int idx   0      while   idx  lt  str length     amp  amp   str charAt idx     ch           idx        return str substring idx

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I came across a situation where I had to remove not only the first character  if it was a    but the first set of characters   String myString      Hello World could be the starting point  but I would only want to keep the Hello World  this could be done as following   while  myString charAt 0               Remove all the   chars in front of the real string     myString   myString substring 1  myString length         For OP s case  replace while with if and it works aswell

User · Answer

The key thing to understand in Java is that Strings are immutable -- you can t change them   So it makes no sense to speak of  removing a character from a string    Instead  you make a NEW string with just the characters you want   The other posts in this question give you a variety of ways of doing that  but its important to understand that these don t change the original string in any way   Any references you have to the old string will continue to refer to the old string  unless you change them to refer to a different string  and will not be affected by the newly created string   This has a number of implications for performance   Each time you are  modifying  a string  you are actually creating a new string with all the overhead implied  memory allocation and garbage collection    So if you want to make a series of modifications to a string and care only about the final result  the intermediate strings will be dead as soon as you  modify  them   it may make more sense to use a StringBuilder or StringBuffer instead

[java] Java - removing first character of a string

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