java convert decimal to hex

1public class ConvertHexToDecimal
2{
3   public static void main(String[] args)
4   {
5      String strHex = "b";
6      int decimal = Integer.parseInt(strHex, 16);
7      System.out.println("Decimal number : " + decimal);
8   }
9}

1Integer.toHexString()

1public class DecimalToHexExample2{    
2public static String toHex(int decimal){    
3     int rem;  
4     String hex="";   
5     char hexchars[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};  
6    while(decimal>0)  
7     {  
8       rem=decimal%16;   
9       hex=hexchars[rem]+hex;   
10       decimal=decimal/16;  
11     }  
12    return hex;  
13}    
14public static void main(String args[]){      
15     System.out.println("Hexadecimal of 10 is: "+toHex(10));  
16     System.out.println("Hexadecimal of 15 is: "+toHex(15));  
17     System.out.println("Hexadecimal of 289 is: "+toHex(289));  
18}} 

1int integer = 18;
2
3String hexString = Integer.toHexString(integer);

1public class DecimalToBinaryExample2{    
2public static void toBinary(int decimal){    
3     int binary[] = new int[40];    
4     int index = 0;    
5     while(decimal > 0){    
6       binary[index++] = decimal%2;    
7       decimal = decimal/2;    
8     }    
9     for(int i = index-1;i >= 0;i--){    
10       System.out.print(binary[i]);    
11     }    
12System.out.println();//new line  
13}    
14public static void main(String args[]){      
15System.out.println("Decimal of 10 is: ");  
16toBinary(10);    
17System.out.println("Decimal of 21 is: ");  
18toBinary(21);    
19System.out.println("Decimal of 31 is: ");    
20toBinary(31);  
21}}    

1import java.util.Scanner;
2public class DecimalToHexaExample 
3{
4   public static void main(String[] args) 
5   {
6      Scanner sc = new Scanner(System.in);
7      System.out.println("Please enter decimal number: ");
8      int decimal = sc.nextInt();
9      String strHexadecimal = "";
10      while(decimal != 0)
11      {
12         int hexNumber = decimal % 16;
13         char charHex;
14         if(hexNumber <= 9 && hexNumber >= 0)
15         {
16            charHex = (char)(hexNumber + '0');
17         }
18         else
19         {
20            charHex = (char)(hexNumber - 10 + 'A');
21         }
22         strHexadecimal = charHex + strHexadecimal;
23         decimal = decimal / 16;
24      }
25      System.out.println("Hexadecimal number: " + strHexadecimal);
26      sc.close();
27   }
28}