Java program to implement character and string interconversion

Comprehensive Java Examples

In this program, you will learn how to convert a character (char) to a string and vice versa in Java.

Example1Convert a char to a String

public class CharString {
　　　　public static void main(String[] args) {
　　　　　　　　char ch = 'c';
　　　　　　　　String st = Character.toString(ch);
　　　　　　　　//　or
　　　　　　　　//　st = String.valueOf(ch);
　　　　　　　　System.out.println("The string is: ")　+　st);
　　　　}
}

When the program is run, the output is:

The string is: c

In the above program, we stored a character in the variable ch. We use the Character class's toString() method to convert the character to a string st.

Additionally, we can also use the String's valueOf() method for the conversion. However, both are the same internally.

Example2Convert a char array to a String

If you have a char array instead of just a char, we can easily convert it to a string using the String method, as shown below:

public class CharString {
　　　　public static void main(String[] args) {
　　　　　　　　char[] ch = {'a', 'e', 'i', 'o', 'u'};
　　　　　　　　String st = String.valueOf(ch);
　　　　　　　　String st2　= new String(ch);
　　　　　　　　System.out.println(st);
　　　　　　　　System.out.println(st2);
　　　　}
}

When the program is run, the output is:

aeiou
aeiou

In the above program, we have a char array ch containing vowels. We use the String's valueOf() method again to convert the character array to a String.

We can also use the String constructor with the character array ch as the conversion parameter.

Example3Convert a string to a character array

We can also use the String's toCharArray() method to convert a string to a char array (but not to a char).

import java.util.Arrays;
public class StringChar {
　　　　public static void main(String[] args) {
　　　　　　　　String st = "This is great";
　　　　　　　　char[] chars = st.toCharArray();
　　　　　　　　System.out.println(Arrays.toString(chars));
　　　　}
}

When the program is run, the output is:

[T, h, i, s,   , i, s,   , g, r, e, a, t]

In the above program, we store a string in the variable st. We use the String.toCharArray() method to convert the string to a character array stored in chars.

Then, we use the Arrays.toString() method to print the elements in the form of a chars array.

Comprehensive Java Examples