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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 trailing-surrogate code unit). Such values do not represent characters by themselves but are used in the representation of supplementary characters in the UTF-16 encoding. Syntax:

public static boolean isLowSurrogate(char ch)

Parameters: The function accepts one mandatory parameter ch which specifies the character to be tested. Return Value: The function returns a boolean value. The value returned is True if the char value is between MIN_LOW_SURROGATE and MAX_LOW_SURROGATE inclusive, False otherwise. Below programs illustrate the Character.isLowSurrogate() method: Program 1:

Java

// Java program to illustrate the
// Character.isLowSurrogate() method
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 char primitives c1, c2
        char c1 = '\udc25', c2 = 'h';

        // assign isLowSurrogate results of
        // c1, c2 to boolean primitives bool1, bool2
        boolean bool1 = Character.isLowSurrogate(c1);
        System.out.println("c1 is a Unicode low-surrogate ? " + bool1);

        boolean bool2 = Character.isLowSurrogate(c2);
        System.out.println(c2 + " is a Unicode low-surrogate ? " + bool2);
    }
}

Output:

c1 is a Unicode low-surrogate ? true
h is a Unicode low-surrogate ? false

Program 2:

Java

// Java program to illustrate the
// Character.isLowSurrogate() method
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 char primitives c1, c2
        char c1 = '\udc29', c2 = 'x';

        // assign isLowSurrogate results of
        // c1, c2 to boolean primitives bool1, bool2
        boolean bool1 = Character.isLowSurrogate(c1);
        System.out.println("c1 is a Unicode low-surrogate ? " + bool1);

        boolean bool2 = Character.isLowSurrogate(c2);
        System.out.println(c2 + " is a Unicode low-surrogate ? " + bool2);
    }
}

Output:

c1 is a Unicode low-surrogate ? true
x is a Unicode low-surrogate ? false

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

Character.isLowSurrogate() method in Java with examples

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