substring index range

Question

Code   public class Test       public static void main String   args            String str    University           System out println str substring 4  7                 Output  ers  I do not really understand how the substring method works  Does the index start at 0  If I start with 0  e is at index 4 but char i is at 7 so the output would be ersi

User · Answer

The substring starts at  and includes the character at the location of the first number given and goes to  but does not include the character at the last number given

User · Answer

public String substring int beginIndex  int endIndex    beginIndex   the begin index  inclusive   endIndex   the end index  exclusive   Example   public class Test        public static void main String args              String Str   new String  Hello World             System out println Str substring 3  8               Output   lo Wo    From 3 to 7 index   Also there is another kind of substring   method   public String substring int beginIndex    beginIndex   the begin index  inclusive  Returns a sub string starting from beginIndex to the end of the main String   Example   public class Test        public static void main String args              String Str   new String  Hello World             System out println Str substring 3              Output   lo World    From 3 to the last index

User · Answer

Both are 0-based  but the start is inclusive and the end is exclusive  This ensures the resulting string is of length start - end    To make life easier for substring operation  imagine that characters are between indexes   0 1 2 3 4 5 6 7 8 9 10   lt - available indexes for substring   u n i v E R S i t y                       start  end -- gt  range of  E R S    Quoting the docs      The substring begins at the specified   beginIndex and extends to the   character at index endIndex - 1  Thus   the length of the substring is   endIndex-beginIndex

User · Answer

Like you I didn t find it came naturally  I normally still have to remind myself that   the length of the returned string is   lastIndex - firstIndex that you can use the length of the string as the lastIndex even though there is no character there and trying to reference it would throw an Exception   so    University  substring 6  10    returns the 4-character string  sity  even though there is no character at position 10

User · Answer

See the javadoc  It s an inclusive index for the first argument and exclusive for the second

User · Answer

For substring startIndex  endIndex   startIndex is inclusive and endIndex are exclusive  The startIndex and endIndex are very confusing  I would understand substring startIndex  length  to remember that

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public class SubstringExample       public static void main String   args                 String str  OOPs is a programming paradigm               System out println   Length is      str length              System out println   Substring is      str substring 10  30              Output   length is  31  Substring is  programming paradigm

User · Answer

Yes  the index starts at zero  0   The two arguments are startIndex and endIndex  where per the documentation      The substring begins at the specified beginIndex and extends to the character at index endIndex - 1    See here for more information

User · Answer

0  U  1  n  2  i  3  v  4  e  5  r  6  s  7  i  8  t  9  y  Start index is inclusive  End index is exclusive  Javadoc link

[java] substring index range

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