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boolean isWhitespace(char ch)

public class Test {

    public static void main(String args[]) {
        System.out.println(Character.isWhitespace('c'));
        System.out.println(Character.isWhitespace(' '));
        System.out.println(Character.isWhitespace('\n'));
        System.out.println(Character.isWhitespace('\t'));
    }
}

false
true
true
true