Character.isLowSurrogate() method in Java with examples

Character.isLetterOrDigit() in Java with examples

Last Updated : 06 Dec, 2018

The java.lang.Character.isLetterOrDigit(char ch) is an inbuilt method in java which determines if the specified character is a letter or digit. Syntax:

public static boolean isLetterOrDigit(char ch)

Parameters: The function accepts a single mandatory parameter ch which signifies the character to be tested. Return value: This function returns a boolean value. The boolean value is true if the character is a letter or digit else it false. Below programs illustrate the above method: Program 1:

Java

// Java program to illustrate the
// Character.isLetterOrDigit() method

import java.lang.*;

public class GFG {

    public static void main(String[] args)
    {

        // two characters
        char c1 = 'Z', c2 = '2';

        // Function to check if the character is letter or digit
        boolean bool1 = Character.isLetterOrDigit(c1);
        System.out.println(c1 + " is a letter/digit ? " + bool1);

        // Function to check if the character is letter or digit
        boolean bool2 = Character.isLetterOrDigit(c2);
        System.out.println(c2 + " is a letter/digit ? " + bool2);
    }
}

Output:

Z is a letter/digit ? true
2 is a letter/digit ? true

Program 2:

Java

// Java program to illustrate the
// Character.isLetterOrDigit() method

import java.lang.*;

public class GFG {

    public static void main(String[] args)
    {

        // assign character
        char c1 = 'D', c2 = '/';

        // Function to check if the character is letter or digit
        boolean bool1 = Character.isLetterOrDigit(c1);
        System.out.println(c1 + " is a letter/digit ? " + bool1);

        // Function to check if the character is letter or digit
        boolean bool2 = Character.isLetterOrDigit(c2);
        System.out.println(c2 + " is a letter/digit ? " + bool2);
    }
}

Output:

D is a letter/digit ? true
/ is a letter/digit ? false

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isLetterOrDigit(char)

Character.isLowSurrogate() method in Java with examples

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