String to Char Conversion in Java
Sometimes we have to convert String to the character array in java programs or convert a string to char from specific index.
String to char Java
String class has three methods related to char. Let’s look at them before we look at a java program to convert string to char array.
- char[] toCharArray(): This method converts string to character array. The char array size is same as the length of the string.
- char charAt(int index): This method returns character at specific index of string. This method throws StringIndexOutOfBoundsException if the index argument value is negative or greater than the length of the string.
- getChars(int srcBegin, int srcEnd, char dst[], int dstBegin): This is a very useful method when you want to convert part of string to character array. First two parameters define the start and end index of the string; the last character to be copied is at index srcEnd-1. The characters are copied into the char array starting at index dstBegin and ending at dstBegin + (srcEnd-srcBegin) – 1.
Let’s look at a simple string to char array java program example.
package com.journaldev.string;
public class StringToCharJava {
public static void main(String[] args) {
String str = "journaldev";
//string to char array
char[] chars = str.toCharArray();
System.out.println(chars.length);
//char at specific index
char c = str.charAt(2);
System.out.println(c);
//Copy string characters to char array
char[] chars1 = new char[7];
str.getChars(0, 7, chars1, 0);
System.out.println(chars1);
}
}
Consclusion
In above program, toCharArray and charAt usage is very simple and clear. In getChars example, first 7 characters of str will be copied to chars1 starting from its index 0. That’s all for converting string into char java program.
