Char is 16 bit unsigned data type in Java used to store characters and String is an immutable array of char. In Java you cannot cast a primitive char element to String.
Below I have given five methods to convert a char to String. Also I have included common mistakes that gives compile time errors.
package com.deepumohan.tech.chartostring;
public class CharToString {
public static void main(String[] args) {
char x = 'x';
System.out.println(concatBlankString(x));
System.out.println(stringValueOf(x));
System.out.println(characterToString(x));
System.out.println(characterObjectToString(x));
System.out.println(charArray(x));
}
// append a blank string
public static String concatBlankString(char x) {
return x + "";
}
// use String.valueOf(char) static function
public static String stringValueOf(char x) {
return String.valueOf(x);
}
// use Character.toString(char) static function
public static String characterToString(char x) {
return Character.toString(x);
}
// create new Character object from the given char and
// then use object's toString() method
public static String characterObjectToString(char x) {
return new Character(x).toString();
}
// create new char[] array from the char and pass it to
// String constructor
public static String charArray(char x) {
return new String(new char[]{x});
}
/*
// Compile time error
// No suitable constructor found
public static String noConstructor(char x) {
return new String(x);
}
// Compile time error
// Inconvertible types
public static String inconvertibleTypes(char x) {
return (String) x;
}
*/
}
I wonder why Java doesn't include String constructor that accept a single char as argument.
