Character toString() in Java

toString(): This method is available in java.lang.Character class of Java.

Approach 1: When the method does not take any argument.

Syntax:

String java.lang.Character.toString()

This method returns a String object representing this Character's value. The result is a string of length 1 whose sole component is the primitive char value represented by this Character object.

Returns: a string representation of this object.

Exceptions: NA

Java

public class CharactertoString {

    public static void main(String[] args) {

        Character c = 'a';

        System.out.println(c.toString());
    }
}

Output:

a

Approach 2: When the method takes an argument of type char.

Syntax:

String java.lang.Character.toString(char c)

This method takes one argument of type char as its parameter. This method returns a String object representing the specified char. The result is a string of length1 consisting solely of the specified char.

Parameters: One parameter is required for this method.

c: the char to be converted.

Returns: the string representation of the specified char.

Exceptions: NA

Java

public class CharactertoString2 {
    public static void main(String[] args) {

        char c = 'a';
        System.out.println(Character.toString(c));
    }
}

Output:

a

Approach 3: When the method takes an argument of type int.

Syntax:

String java.lang.Character.toString(int codePoint)

This method takes one argument of type int as its parameter. This method returns a String object representing the specified character (Unicode code point). The result is a string of length 1 or 2, consisting solely of the specified codePoint.

Parameters: One parameter is required for this method.

codePoint: the codePoint to be converted.

Returns: the string representation of the specified codePoint.

Throws:

IllegalArgumentException - if the specified codePoint is not a valid Unicode code point.

Java

public class CharactertoStringint {
    public static void main(String[] args) {

        int codePoint = 'A';
        System.out.println(Character.toString(codePoint));
    }
}

Output:

A

Approach 3.1: IllegalArgumentException

Java

public class CharactertoStringint {
    public static void main(String[] args) {

        int codePoint = -1;
        System.out.println(Character.toString(codePoint));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: Not a valid Unicode code point: 0xFFFFFFFF
	at java.base/java.lang.String.valueOfCodePoint(String.java:3760)
	at java.base/java.lang.Character.toString(Character.java:8651)