StringBuilder getChars() in Java with Examples (original) (raw)
Last Updated : 22 May, 2019
The getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) method of StringBuilder class copies the characters starting at the given index:srcBegin to index:srcEnd-1 from String contained by StringBuilder into an array of char passed as parameter to function.
- The characters are copied from StringBuilder into the array dst[] starting at index:dstBegin and ending at index:dstbegin + (srcEnd-srcBegin) – 1.
- The first character to be copied from StringBuilder 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 accepts four different parameters:
- srcBegin: represents index on which we have to start copying.
- srcEnd: represents index on which we have to stop copying.
- dst: represents the array to copy the data into.
- dstBegin: represents index of dest array we start pasting the copied data.
Return Value: This method does not return anything.
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 StringBuilder Class:
Example 1:
class GFG {
`` public static void main(String[] args)
`` {
`` StringBuilder
`` str
`` = new StringBuilder( "WelcomeGeeks" );
`` System.out.println( "String = "
`` + str.toString());
`` char [] array = new char [ 7 ];
`` str.getChars( 0 , 7 , array, 0 );
`` System.out.print( "Char array contains : " );
`` for ( int i = 0 ; i < array.length; i++) {
`` System.out.print(array[i] + " " );
`` }
`` }
}
Output:
String = WelcomeGeeks Char array contains : W e l c o m e
Example 2:
import java.util.*;
class GFG {
`` public static void main(String[] args)
`` {
`` StringBuilder
`` str
`` = new StringBuilder( "evil dead_01" );
`` System.out.println( "String = "
`` + str.toString());
`` char [] array = new char [ 10 ];
`` Arrays.fill(array, '_' );
`` str.getChars( 5 , 9 , array, 3 );
`` System.out.print( "char array contains : " );
`` for ( int i = 0 ; i < array.length; i++) {
`` System.out.print(array[i] + " " );
`` }
`` }
}
Output:
String = evil dead_01 char array contains : _ _ _ d e a d _ _ _
Example 3: To demonstrate StringIndexOutOfBoundException
import java.util.*;
class GFG {
`` public static void main(String[] args)
`` {
`` StringBuilder
`` str
`` = new StringBuilder( "evil dead_01" );
`` char [] array = new char [ 10 ];
`` Arrays.fill(array, '_' );
`` try {
`` str.getChars( 5 , 2 , array, 0 );
`` }
`` catch (Exception e) {
`` System.out.println( "Exception: " + e);
`` }
`` }
}
Output:
Exception: java.lang.StringIndexOutOfBoundsException: srcBegin > srcEnd