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import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a floating-point number:");
        while(sc.hasNext()){
            double num = sc.nextDouble();

            System.out.println("Math.floor(" + num + ") = " + Math.floor(num));
            System.out.println("Math.ceil(" + num + ") = " + Math.ceil(num));
            System.out.println("Math.rint(" + num + ") = " + Math.rint(num));
            System.out.println("Math.round(" + num + ") = " + Math.round(num));
        }
    }
}

$ javac Test.java
$ java Test
Enter a floating-point number:
2.2
Math.floor(2.2) = 2.0
Math.ceil(2.2) = 3.0
Math.rint(2.2) = 2.0
Math.round(2.2) = 2
-2.2
Math.floor(-2.2) = -3.0
Math.ceil(-2.2) = -2.0
Math.rint(-2.2) = -2.0
Math.round(-2.2) = -2
-2.5
Math.floor(-2.5) = -3.0
Math.ceil(-2.5) = -2.0
Math.rint(-2.5) = -2.0
Math.round(-2.5) = -2
2.5
Math.floor(2.5) = 2.0
Math.ceil(2.5) = 3.0
Math.rint(2.5) = 2.0
Math.round(2.5) = 3
2.7
Math.floor(2.7) = 2.0
Math.ceil(2.7) = 3.0
Math.rint(2.7) = 3.0
Math.round(2.7) = 3
-2.7
Math.floor(-2.7) = -3.0
Math.ceil(-2.7) = -2.0
Math.rint(-2.7) = -3.0
Math.round(-2.7) = -3

Math.round(2.2) = 2;
Math.round(-2.2) = -2;
Math.round(2.5) = 3;
Math.round(-2.5) = -2;
Math.round(2.7) = 3;
Math.round(-2.7) = -3