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Java Character isLowSurrogate() Method

Java isLowSurrogate() method is a part of Character class. This method is used to check whether the specified character is a low-surrogate code unit(trailing surrogate code unit) or not.

It must be noted that these values can be used to represent supplementary characters in the UTF-16 encoding and cannot be used to represent the characters by themselves.


public static boolean isLowSurrogate(char ch)  


The parameter passed is the character to be checked for the low-surrogate code unit.


Returns the boolean value true if the char value is between MIN_LOW_SURROGATE and MAX_LOW_SURROGATE inclusive else returns false.

Example 1:

Here, the characters are checked whether they are low-surrogate code units or not.

public class StudyTonight
	public static void main(String[] args)
		char ch1 = 'A';  
		char ch2 = 'u';  
		char ch3 = '\udc34';  
		char ch4 = '4';  
		char ch5 = '*';  

		boolean b1 = Character.isLowSurrogate(ch1);  
		boolean b2 = Character.isLowSurrogate(ch2);  
		boolean b3 = Character.isLowSurrogate(ch3);  
		boolean b4 = Character.isLowSurrogate(ch4);  
		boolean b5 = Character.isLowSurrogate(ch5);  

		System.out.println(ch1 +" is a low-surrogate?:  "+b1);  
		System.out.println(ch2 +" is a low-surrogate?:  "+b2);  
		System.out.println(ch3 +" is a low-surrogate?:  "+b3);  
		System.out.println(ch4 +" is a low-surrogate? : "+b4);  
		System.out.println(ch5 +" is a low-surrogate?:  "+b5);  

A is a low-surrogate?: false
u is a low-surrogate?: false
? is a low-surrogate?: true
4 is a low-surrogate? : false
* is a low-surrogate?: false

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent output.

import java.util.Scanner; 
public class StudyTonight
	public static void main(String[] args)
			System.out.print("Enter the character ");  
			Scanner sc = new Scanner(;         
			char ch =;  
			boolean b = Character.isLowSurrogate(ch);
			System.out.println(ch + " is a low-surrogate? : "+b);
		catch(Exception e)
			System.out.println("Invalid Input!!");

Enter the character m
m is a low-surrogate? : false
Enter the character *
* is a low-surrogate? : false

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.

About the author:
A Computer Science and Engineering Graduate(2016-2020) from JSSATE Noida. JAVA is Love. Sincerely Followed Sachin Tendulkar as a child, M S Dhoni as a teenager, and Virat Kohli as an adult.