How to write array list to file ?

Question

Hi everyone,
I got a arraylist binaryEncodedData and I want to write to file. how do I make it into a HexString ? I had tried to convert it this way and it doesn't work. I try to print out the temp value but there was nothing . Please help, thanks
byte[] bytes = new byte[binaryEncodedData.size()];
String temp;
for(int i=0;i<binaryEncodedData.size();i++)
     bytes[i] = (byte)binaryEncodedData.get(i);
for(int i=0;i<bytes.length;i++)
     //System.out.println(Integer.toHexString(bytes[i] & 0X00FF));
     temp.concat(Integer.toHexString(bytes));
System.out.println("Temp = " + temp);

Answer 1

Strings are immutable. The correct way to get anything to print out is this:
for(int i=0;i<bytes.length;i++)
//System.out.println(Integer.toHexString(bytes & 0X00FF));
temp = temp.concat(Integer.toHexString(bytes));
}I'm not sure why you want this in Hex, but if it is not a requirement standard serialization would be easier.