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Java Convert Octal to Decimal

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robaa
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2022-11-12
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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:

 

public static int parseInt(String s,int radix)  

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robaa
2022-11-12
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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);  
}}

 

Output:

81

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));  
}}

 

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));    
}}

 

Output:

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

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