import math java

import java.lang.Math.*;

Example

class MathJava {
	public static void main(String[] args) {
		// Declaring the variables
        int num1 = -2;
        float num2 = .8f;
 
        // Printing the values
        System.out.println("Initial value of int  : "+num1);
        System.out.println("Initial value of int  : "+num2);
 
 
        // Use of .abs() method to get the absoluteValue
        int Absi = Math.abs(num1);
        float Absf = Math.abs(num2);
 
        System.out.println("Absolute value of int : "+Absi);
        System.out.println("Absolute value of int : "+Absf);
        System.out.println("");
 
        // Use of acos() method Value greater than 1, so passing NaN
        double Acosi = Math.acos(60);
        System.out.println("acos value of Acosi : "+Acosi);
        double x = Math.PI;
 
        // Use of toRadian() method
        x = Math.toRadians(x);
        double Acosj = Math.acos(x);
        System.out.println("acos value of Acosj : "+Acosj);

	}
}

Output:

Initial value of int  : -2
Initial value of int  : 0.8
Absolute value of int : 2
Absolute value of int : 0.8

acos value of Acosi : NaN
acos value of Acosj : 1.5159376794536454