GeeksforGeeks

How to Shuffle Characters in a String in Java?

Last Updated: 23 July 2025

In this article, we will learn how to shuffle characters in a String by using Java programming. For this, we have taken a String value as input and the method is available...read more

Check if a String Contains only Alphabets in Java

Last Updated: 15 July 2025

In Java, to check if a string contains only alphabets, we have to verify each character to make sure it falls within the range of valid alphabetic characters. There are va...read more

Java

Java-Strings

java-regular-expression

How to Check if a String Contains only Digits in Java?

Last Updated: 15 July 2025

In Java, to check if a string contains only digits, we can use various methods such as simple iteration, regular expressions, streams, etc.Example:The example below uses t...read more

Java

number-digits

Java-Strings

java-regular-expression

Java-Character

Java-String-Programs

regular-expression

Difference between String and Character array in Java

Last Updated: 25 July 2024

Unlike C/C++ Character arrays and Strings are two different things in Java. Both Character Arrays and Strings are a collection of characters but are different in terms of ...read more

Character.isSpaceChar() method in Java

Last Updated: 06 December 2018

The java.lang.Character.isSpaceChar(char ch) is an inbuilt method in java which determines if the specified character is a Unicode space character. A character is consider...read more

Character.isHighSurrogate() method in Java with examples

Last Updated: 06 December 2018

The java.lang.Character.isHighSurrogate() is a inbuilt method in java which determines if the given char value is a Unicode high-surrogate code unit (also known as leading...read more

Character.isLowSurrogate() method in Java with examples

Last Updated: 06 December 2018

The java.lang.Character.isLowSurrogate(char ch) is an inbuilt method in java which determines if the given char value is a Unicode low-surrogate code unit (also known as t...read more

Character.isJavaIdentifierStart() method in Java

Last Updated: 06 December 2018

The java.lang.Character.isJavaIdentifierStart(char ch) is an inbuilt method in java which determines if the specified character is permissible as the first character in a ...read more

Character.isIdentifierIgnorable() in Java with Examples

Last Updated: 06 December 2018

The java.lang.Character.isIdentifierIgnorable(char ch) is an inbuilt method in java that determines if the specified character should be regarded as an ignorable character...read more

Character.isWhitespace() method in Java with examples

Last Updated: 06 December 2018

The java.lang.Character.isWhitespace() is an inbuilt method in a java that determines if the specified character (Unicode code point) is white space according to Java. A ...read more

Character.isLetterOrDigit() in Java with examples

Last Updated: 06 December 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 boolea...read more

Character.isJavaIdentifierPart() Method in Java with Examples

Last Updated: 06 December 2018

The Character.isJavaIdentifierPart(int codePoint) is an inbuilt method in java that determines if the specified character may be part of a Java identifier as other tha...read more

Character.isValidCodePoint() Method in Java with Examples

Last Updated: 06 December 2018

The Character.isValidCodePoint() is an inbuilt method in java that determines whether the specified code point mentioned in the parameter is a valid Unicode code point val...read more

Character.digit() in Java with examples

Last Updated: 06 December 2018

The java.lang.Character.digit() is an inbuilt method in java which returns the numeric value of the character ch in the specified radix. It returns -1 if the radix is not ...read more

Character.isJavaIdentifierStart() Method in Java

Last Updated: 06 December 2018

The Character.isJavaIdentifierStart(int codePoint) is an inbuilt method in java that determines if the character (Unicode code point) is permissible as the first character...read more