serial data receiving in java

[visva]

In my project i am reading data what i sent from micro controller.But i am sending Hexadecimal value from micro controller.In java receiving those data's.
but that is something unknown character's are displaying. please any one help me how to convert those hexadecimal value to ASCII in java.

Note:
The following coding i have using in my project. Any one tell me what i need to change in this receiving coding.

        			case SerialPortEvent.DATA_AVAILABLE:
            				byte[] readBuffer = new byte[20];
			
				
           	 			try 
				{
                				while (inputStream.available() > 0) 
					{
                    					int numBytes = inputStream.read(readBuffer);
						
					
	              				}
					
                				System.out.print(new String(readBuffer));
            				} 
				catch (IOException e) {System.out.println(e);}
            			break;
			default:
				System.out.println("There is no data");

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