Java Convert Octal to Decimal

by Online Tutorials Library July 22, 2022

Java Convert Octal to Decimal

We can convert octal to decimal in java using Integer.parseInt() method or custom logic.

Java Octal to Decimal conversion: Integer.parseInt()

The Integer.parseInt() method converts a string to an int with the given radix. If you pass 8 as a radix, it converts an octal string into decimal. Let us see the signature of parseInt() method:

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

 //Java Program to demonstrate the use of Integer.parseInt() method //for converting Octal to Decimal number public class OctalToDecimalExample1{ public static void main(String args[]){ //Declaring an octal number String octalString=”121″; //Converting octal number into decimal int decimal=Integer.parseInt(octalString,8); //Printing converted decimal number System.out.println(decimal); }} 

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Output:

Let’s see another example of Integer.parseInt() method.

 //Shorthand example of Integer.parseInt() method public class OctalToDecimalExample2{ public static void main(String args[]){ System.out.println(Integer.parseInt(“121”,8)); System.out.println(Integer.parseInt(“23”,8)); System.out.println(Integer.parseInt(“10”,8)); }} 

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Output:

81 19 8

Java Octal to Decimal conversion: Custom Logic

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

 //Java Program to demonstrate the conversion of Octal to Decimal //using custom code public class OctalToDecimalExample3{ //Declaring method public static int getDecimal(int octal){       //Declaring variable to store decimal number     int decimal = 0;       //Declaring variable to use in power     int n = 0;       //writing logic      while(true){         if(octal == 0){           break;         } else {             int temp = octal%10;             decimal += temp*Math.pow(8, n);             octal = octal/10;             n++;          }       }       return decimal;   }   public static void main(String args[]){     //Printing the result of conversion System.out.println("Decimal of 121 octal is: "+getDecimal(121));   System.out.println("Decimal of 23 octal is: "+getDecimal(23));   System.out.println("Decimal of 10 octal is: "+getDecimal(10));   }} 

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Output:

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

References

Next TopicJava Decimal to Octal

Java Convert Octal to Decimal

Java Convert Octal to Decimal

Java Octal to Decimal conversion: Integer.parseInt()

Java Octal to Decimal conversion: Custom Logic

References

Java ObjectInputStream

Java String toCharArray() method

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