Java Convert Decimal to Octal

Let's see the simple example of converting decimal to octal in java.

//Java Program to demonstrate the use of Integer.toOctalString() method  
public class DecimalToOctalExample1{  
public static void main(String args[]){  
//Using the predefined Integer.toOctalString() method  
//to convert decimal value into octal  
System.out.println(Integer.toOctalString(8));  
System.out.println(Integer.toOctalString(19));  
System.out.println(Integer.toOctalString(81));  
}}  

Output:

10
23
121

Java Decimal to Octal conversion: Custom Logic

We can convert decimal to octal in java using custom logic.

//Java Program to demonstrate the decimal to octal conversion  
//using custom code  
public class DecimalToOctalExample2{    
//creating method for conversion so that we can use it many times  
public static String toOctal(int decimal){    
    int rem; //declaring variable to store remainder  
    String octal=""; //declareing variable to store octal  
    //declaring array of octal numbers  
    char octalchars[]={'0','1','2','3','4','5','6','7'};  
    //writing logic of decimal to octal conversion   
    while(decimal>0)  
    {  
       rem=decimal%8;   
       octal=octalchars[rem]+octal;   
       decimal=decimal/8;  
    }  
    return octal;  
}    
public static void main(String args[]){      
//Calling custom method to get the octal number of given decimal value  
System.out.println("Decimal to octal of 8 is: "+toOctal(8));  
System.out.println("Decimal to octal of 19 is: "+toOctal(19));  
System.out.println("Decimal to octal of 81 is: "+toOctal(81));  
}}

Output:

Decimal to octal of 8 is: 10
Decimal to octal of 19 is: 23
Decimal to octal of 81 is: 121