StringBuffer getChars() method in Java with Examples
Last Updated :
17 Nov, 2022
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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:
Java
// Java program to demonstrate// the getChars() Method.import java.util.*;class GFG { public static void main(String[] args) { // create a StringBuffer object // with a String pass as parameter StringBuffer str = new StringBuffer("Geeks For Geeks"); // print string System.out.println("String = " + str.toString()); // create a char Array char[] array = new char[15]; // initialize all character to .(dot). Arrays.fill(array, '.'); // get char from index 0 to 9 // and store in array start index 3 str.getChars(0, 9, array, 1); // print char array after operation System.out.print("char array contains : "); for (int i = 0; i < array.length; i++) { System.out.print(array[i] + " "); } }} |
Output:
String = Geeks For Geeks char array contains : . G e e k s F o r . . . . .
Example 2: To demonstrate StringIndexOutOfBoundsException.
Java
// Java program to demonstrate// exception thrown by the getChars() Method.import java.util.*;class GFG { public static void main(String[] args) { // create a StringBuffer object // with a String pass as parameter StringBuffer str = new StringBuffer("Contribute Geeks"); // create a char Array char[] array = new char[10]; // initialize all character to $(dollar sign). Arrays.fill(array, '$'); try { // if start is greater then end str.getChars(2, 1, array, 0); } catch (Exception e) { System.out.println("Exception: " + e); } }} |
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)
