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value = inStream.read();
error = errorStream.read();

read() reads next byte of data from input stream
so in the 1st iteration its (char)value=h and (char)error=j. you are reading one character...

while ((value = inStream.read()) != -1 || (error = errorStream.read()) != -1) {
if (value > 0) {
System.out.print((char) value);
}
...

OutStreamAccumulator out = compiler.new OutStreamAccumulator(process.getInputStream());

getInputStream returns the only input stream connected to the normal output of the subprocess.
try using...

you can also try using hashmap with Integer(0-9) as key and String as value and then store the 10 key value pair as you have specified. also have two arrays key[] and numOfTaps[]. so when you press...

once you take the second input, its overwriting the first input.
try reading java arrays.

you are calling the methods on "stock" but it is not refrencing to any object.
whenever you need to call a method you hav to first create an object and give the refrence to it.
Stock stock;...

you can actually use hashmap
write a function which returns hashmap
store your each subject scores in hashmap<K,V> where K is subject name and value is subject score
and in main function u can get...