Java – Find Arc Sine – asin() Method – Examples & Explanation

asin() method exists in Math class of java.lang package.
Since: JDK1.0

The declaration of asin() method is:

public static double asin(double x)

The syntax of asin() method in Java is:

 
java.lang.Math.asin(double x)

Example

/*
*Find the sum of given input(double) without importing the 
java.lang Package.
*/
public class JavaMathExample {
    public static void main(String[] args) {
      //Declaring variables
        double x = 30.0;
      // convert degree to radians
      x = Math.toRadians(x);
      //Printing result to the console

      System.out.println( java.lang.Math.asin(x));
    }
}

Output:

0.5510695830994463


x – Where x is any valid double input value. This parameter is required.

If the x parameter is not a number asin() method returns an error.
If there is no argument (x – input value) passes to the method, the compiler will produce an error.Example

/*
*This example returns a compile time error
*/
import java.lang.*; //importing java.lang package

public class JavaMathExample {
    public static void main(String[] args) {

        //Declaring variables
        String x = "Not a number";
        double result;

        //argument is not a number
        result = Math.asin(x);
        System.out.println(result);

        //Here no argument is used
        result = Math.asin();
        System.out.println(result);


    }

}

Output:
Error

asin() method returns the sum of a double value for the given input (x – parameter).

import java.lang.*; //importing java.lang package

public class JavaMathExample {
    public static void main(String[] args) {
        double negativeValue = -1;
        double positiveValue = 1;
        double zero = 0;
        System.out.println("sum of a Negative Value: "+Math.asin(negativeValue));
        System.out.println("sum of a Positive Value: "+Math.asin(positiveValue));
        System.out.println("sum of Zero: "+Math.asin(zero));
    }
}

Output:

sum of a Negative Value: -1.5707963267948966
sum of a Positive Value: 1.5707963267948966
sum of Zero: 0.0


import java.lang.*; //importing java.lang package

public class JavaMathExample {
    public static void main(String[] args) {
        //Declare and initialize an array containing double values
        double test [] = { Double.MAX_VALUE, Double.MIN_VALUE, 
		Double.NaN, Double.MIN_EXPONENT, 42.867e-12, 16.852, 0, -2.58, -78.8569e7 };

        //Use for loop to print sum of each element of the array
        for (int i=0; i < test.length; i++) {
            System.out.println(  Math.asin(test[i])  );
        }

    }
}

Output:

NaN
4.9E-324
NaN
NaN
4.2867E-11
NaN
0.0
NaN
NaN


If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
If the argument is zero, then the result is a zero with the same sign as the argument.
Example

/*
*This example shows some special cases of asin() method in Java
*/
import java.lang.*; //importing java.lang package

public class JavaMathExample {
    public static void main(String[] args) {

        //Declaring variables
        double positiveZero = 0;
        double negativeZero = -0;
        double positiveInfinity = Double.POSITIVE_INFINITY;
        double negativeInfinity = Double.NEGATIVE_INFINITY;
        double nan = Double.NaN;
        double result;

        //Here argument is positive zero, output will also be positive zero
        result = Math.asin(positiveZero);
        System.out.println(result);

        //Here argument is negative zero, output will be positive zero
        result = Math.asin(negativeZero);
        System.out.println(result);

        //Here argument is positive infinity, output will also be positive infinity
        result = Math.asin(positiveInfinity);
        System.out.println(result);

        //Here argument is negative infinity, output will be negative infinity
        result = Math.asin(negativeInfinity);
        System.out.println(result);

        //Here argument is NaN, output will be NaN
        result = Math.asin(nan);
        System.out.println(result);


    }

}

Output:

0.0
0.0
NaN
NaN
NaN