Java Integer toOctalString() Method

The toOctalString() method of Integer class returns a string representation of the integer argument as an unsigned integer in octal base 8.

The following characters are used as octal digits:

Note: If the argument is negative, the unsigned integer value is the argument plus 2³² otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' otherwise, the first character representation of the unsigned magnitude will not be the zero character.

Explanation:

Decimal Number	Operation (%)	Quotient	Remainder	Octal Result
224	8	28	0	0
28	8	3	4	40
3	8	0	3	340

Hence:

Decimal Number = 224
Octal Number = 340
Varification     = 3*82 + 4*81 + 0*80
		= 3*64 + 4*8 + 0* 1
		= 192 + 32 + 0
		= 224

Syntax:

Following is the declaration of toOctalString() method:

Parameter:

DataType	Parameter	Description	Required/Optional
int	i	It specifies the number to be converted in octal string.	Required

Returns:

The toOctalString() method returns the string representation of the unsigned integer value represented by the argument in octal (base 8).

Exceptions:

Compatibility Version:

Java 1.0.2 and above.

Example 1

public class IntegerToOctalStringExample1 {
	public static void main(String[] args) {		
	    int i = 224;
	    System.out.println("Number = " + i);
	    //returns the string representation of the integer value in octal form
	    System.out.println("Octal representation is = "+ Integer.toOctalString(i));
    }
}

Output:

Number = 224
Octal representation is = 340

Example 2

import java.util.Scanner;
public class IntegerToOctalStringExample2 {
	public static void main(String[] args) {
		System.out.print("Enter the Number = ");
		Scanner readInput = new Scanner(System.in);
		int i = readInput.nextInt();
		readInput.close();
	    System.out.println("Number = " + i);
	    //returns the string representation of the integer value in octal form
	    System.out.println("Octal representation is = " + Integer.toOctalString(i));
    }
}

Output:

Enter the Number = 175
Number = 175
Octal representation is = 257

Example 3

public class IntegerToOctalStringExample3 {
	public static void main(String[] args) {
	    System.out.println(Integer.toOctalString(200));
	    System.out.println(Integer.toOctalString(-200));	    
	    System.out.println(Integer.toOctalString(1000));
	    System.out.println(Integer.toOctalString(-1000));
    }
}

Output: