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StringBuffer getChars() method in Java with Examples

Last Updated : 17 Nov, 2022

The getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) method of StringBuffer class copies the characters starting at the index:srcBegin to index:srcEnd-1 from actual sequence into an array of char passed as parameter to function.

  • The characters are copied into the array of char dst[] starting at index:dstBegin and ending at index:dstbegin + (srcEnd-srcBegin) – 1.
  • The first character to be copied to array is at index srcBegin and the last character to be copied is at index srcEnd-1.
  • The total number of characters to be copied is equal to srcEnd-srcBegin.

Syntax:

public void getChars(int srcBegin, int srcEnd, 
 char[] dst, int dstBegin)

Parameters: This method takes four parameters:

  • srcBegin: int value represents index on which the copying is to be started.
  • srcEnd: int value represents index on which the copying is to be stopped.
  • dst: array of char represents the array to copy the data into.
  • dstBegin: int value represents index of dst array to start pasting the copied data.

Returns: This method returns nothing. Exception: This method throws StringIndexOutOfBoundsException if:

  • srcBegin < 0
  • dstBegin < 0
  • srcBegin > srcEnd
  • srcEnd > this.length()
  • dstBegin+srcEnd-srcBegin > dst.length

Below programs demonstrate the getChars() method of StringBuffer Class: Example 1: 

Output:
String = Geeks For Geeks
char array contains : . G e e k s F o r . . . . .

Example 2: To demonstrate StringIndexOutOfBoundsException. 

Output:
Exception: java.lang.StringIndexOutOfBoundsException: srcBegin > srcEnd

References: https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuffer.html#getChars(int, int, char%5B%5D, int)

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