NUMBERS

* Numbers

package Numbers;

public class AssignmentNumber
{

    public static void main(String[] args)
    {
        System.out.println("(xxxValue() Method)");

        /*
         * Syntax :
         * byte byteValue()
         * short shortValue()
         * long longValue()
         * float floatValue()
         * double doubleValue()
         * Parameters :
         * ----
         * Returns :
         * the numeric value represented by this object
         * after conversion to specified type
         */

        // creating a Double class object with value "6.9685"
        Double d = new Double("6.9685");

        // Converting this Double(Number) object to
        // different primitive data types
        byte b = d.byteValue();
        short s = d.shortValue();
        int i = d.intValue();
        long l = d.longValue();
        float f = d.floatValue();
        double d1 = d.doubleValue();

        System.out.println("value of d after converting is to byte = " + b);
        System.out.println("value of d after converting is to short = " + s);
        System.out.println("value of d after converting is to int = " + i);
        System.out.println("value of d after converting is to long = " + l);
        System.out.println("value of d after converting is to float = " + f);
        System.out.println("value of d after converting is to double = " + d1);

        System.out.println("\n(CompareTo() Method)");

        /*
         * Syntax :
         * public int compareTo( NumberSubClass referenceName )
         * Parameters :
         * referenceName - any NumberSubClass type value
         * Returns :
         * the value 0 if the Number is equals to the argument.
         * the value -1 if the Number is less than the argument.
         * the value 1 if the Number is greater than the argument.
         */

        // Creating an Integer class object with value "10"
        @SuppressWarnings("deprecation")
        Integer i1 = new Integer("10");

        // comparing value of i
        System.out.println(i1.compareTo(7));
        System.out.println(i1.compareTo(11));
        System.out.println(i1.compareTo(10));
        System.out.println(i1.compareTo(30));

        System.out.println("\n(Equals() Method)");

        /*
         * Syntax :
         * public boolean equals (Object obj)
         * Parameters :
         * obj - any object
         * Returns :
         * The method returns true if the argument is not null and
         * is an object of the same type and with the same numeric value,
         * otherwise false.
         */

        // Creating a short Class object with value "15"
        Short s1 = new Short("15");

        // creating a short Class object with value "10"
        Short x = 10;

        // Creating an Integer Class object with value "15"
        Integer y = 15;

        // Creating another Short Class object with value "15"
        Short z = 15;

        // Comparing s with other objects
        System.out.println(s1.equals(x));
        System.out.println(s1.equals(y));
        System.out.println(s1.equals(z));

        System.out.println("\n(ParseInt() Method)");

        /*
         * Syntax :
         * static int parseInt(String s, int radix)
         * Parameters :
         * s - any String representation of decimal
         * radix - any radix value
         * returns :
         * the integer value represented by the argument in decimal.
         * Throws :
         * NumberFormatException : if the string does not contain a parsable integer.
         */

        // Parsing different strings
        int z1 = Integer.parseInt("654",8);
        int a = Integer.parseInt("-FF", 16);
        long l1 = Long.parseLong("2158611234",10);

        System.out.println(z1);
        System.out.println(a);
        System.out.println(l1);

        // run-time NumberFormatException will occur here
        // "RAHMAD" is not a parsable string
        //int x1 = Integer.parseInt("RAHMAD",8);

        // run-time NumberFormatException will occur here
        // (for octal(8),allowed digits are [0-7])
        //int y2 = Integer.parseInt("99",8);


        System.out.println("\n(toString() Method)");

        /*
         * Syntax :
         * String toString()
         * String toString(int i)
         * Parameters :
         * String toString() - no parameter
         * String toString(int i) - i: any integer value
         * Returns :
         * String toString() -
         * returns a String object representing the value of the Number object
         * on which it is invoked.
         * String toString(int i) -
         * returns a decimal String object representing the specified integer(i)
         */

        // demonstrating toString() method
        Integer x2 = 12;

        System.out.println(x2.toString());

        // demonstrating toString(int i) method
        System.out.println(Integer.toString(12));

        System.out.println(Integer.toBinaryString(152));
        System.out.println(Integer.toHexString(152));
        System.out.println(Integer.toOctalString(152));


        System.out.println("\n(valueOf() Method)");

        /*
         * Syntax :
         * Integer valueOf(int i)
         * Integer valueOf(String s)
         * Integer valueOf(String s, int radix)
         * Parameters :
         * i - any integer value
         * s - any String representation of decimal
         * radix - any radik value
         * Returns :
         * valueOf(int i) : an Integer object holding the valuepresentend by the int argument.
         * valueOf(String s) : an Integer object holding value represented by the string argument.
         * valueOf(String s, int radix) : an Integer object holding the value
         * represented by the String argument with base radix.
         * Throws :
         * valueOf(String s) -
         * NumberFormatException : if the string does not contain a parsable integer.
         * valueOf(String s, int radix) -
         * NumberFormatException : if the string does not contain a parsable integer.
         */

        // demonstrating valueOf(int i) method
        System.out.println("Demonstrating valueOf(String i) method");
        Integer i2 = Integer.valueOf(50);
        Double d2 = Double.valueOf(9.36);
        System.out.println(i2);
        System.out.println(d2);

        // demonstrating valueOf(String s) method
        System.out.println("Demonstrating valueOf(String s) method");
        Integer n = Integer.valueOf("333");
        Integer m = Integer.valueOf("-255");
        System.out.println(n);
        System.out.println(m);


        // demonstrating valueOf(String s, int radix) method
        System.out.println("Demonstrating valueOf(String s) method");
        Integer y1 = Integer.valueOf("333",8);
        Integer x1 = Integer.valueOf("-255",16);
        Long l2 = Long.valueOf("51688245", 16);
        System.out.println(y1);
        System.out.println(x1);
        System.out.println(l2);


        // run-time NumberFormatException will occur in below cases
        //Integer a1 = Integer.valueOf("RAHMAD");
        //Integer b1 = Integer.valueOf("RAHMAD",16);


    }

}