Java程序：十六进制转十进制转换

Integer.parseInt("String", base); 

public class Conversion {
   public static void main(String args[]) {  
      // Converting and storing hexadecimal value to dec1 and dec2 with base 16  
      int dec1 = Integer.parseInt("54A", 16);
      int dec2 = Integer.parseInt("41C", 16);
      System.out.println("Decimal value of given Hexadecimal: " + dec1);
      System.out.println("Decimal value of given Hexadecimal: " + dec2);
   }
}

public class Conversion {
   public static void cnvrt(String hexNum) {
      // storing all the hexadecimal digits to this string 
      String hexStr = "0123456789ABCDEF"; 
      // converting given argument to uppercase
      hexNum = hexNum.toUpperCase();   
      int dec = 0;  
      for (int i = 0; i < hexNum.length(); i++) {  
         char ch = hexNum.charAt(i); 
         // fetching characters sequentially 
         int index = hexStr.indexOf(ch); 
         // fetching index of characters  
         dec = 16 * dec + index; 
         // applying the logic of conversion 
      }
      System.out.println("Decimal value of given Hexadecimal: " + dec); 
   }
   public static void main(String args[]) {
      // calling the function with arguments
      cnvrt("54A"); 
      cnvrt("41C");  
   }
}