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Java Convert Decimal to Octal

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robaa
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2022-11-12
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We can convert decimal to octal in java using Integer.toOctalString() method or custom logic.

Java Decimal to Octal conversion: Integer.toOctalString()

The Integer.toOctalString() method converts decimal to octal string. The signature of toOctalString() method is given below:

 

public static String toOctalString(int decimal)  

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robaa
2022-11-12
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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

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