Logical operators
Explanation	Java
and	        &&	a && b
or	        ||	a || b
not	        !	!a


//eg
//number is between 10 and 20
import java.util.Scanner;

public class Example {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("Give a number: ");
        int num = Integer.valueOf(reader.nextLine());

        if (num > 10 && num < 20) {
            System.out.println("Number is between 10 and 20.");
        }
    }
}
Example output:
Give a number: 17
Number is between 10 and 20.