Ejemplo de conversión de código decimal a octal de Java

Ejemplo 1: Java convertir hexadecimal a decimal

public class ConvertHexToDecimal
{
   public static void main(String[] args)
   {
      String strHex = "b";
      int decimal = Integer.parseInt(strHex, 16);
      System.out.println("Decimal number : " + decimal);
   }
}

Ejemplo 2: Java convierte octal a decimal

public class OctalToDecimalDemo
{
   public static void main(String[] args)
   {
      String strOctal = "141";
      // converting octal to decimal number using Integer.parseInt() method
      int decimal = Integer.parseInt(strOctal, 8);
      System.out.println(decimal);
   }
}

Ejemplo 3: Java convierte binario a decimal

import java.util.Scanner;
public class BinaryToDecimalDemo 
{
   public static void main(String[] args) 
   {
      int number, decimal = 0, a = 0;
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter binary number: ");
      String strBinary = sc.nextLine();
      number = Integer.parseInt(strBinary);
      while(number != 0){
         decimal += (number % 10) * Math.pow(2, a);
         number = number / 10;
         a++;
      }
      System.out.println("Decimal number: " + decimal);
      sc.close();
   }
}

Ejemplo 4: convertir decimal a hexadecimal en java

public class DecimalToHexExample2{    
public static String toHex(int decimal){    
     int rem;  
     String hex="";   
     char hexchars[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};  
    while(decimal>0)  
     {  
       rem=decimal%16;   
       hex=hexchars[rem]+hex;   
       decimal=decimal/16;  
     }  
    return hex;  
}    
public static void main(String args[]){      
     System.out.println("Hexadecimal of 10 is: "+toHex(10));  
     System.out.println("Hexadecimal of 15 is: "+toHex(15));  
     System.out.println("Hexadecimal of 289 is: "+toHex(289));  
}}

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