How to send 2 variable value from bash script into java.class

#!/bin/bash
a=10
b=20
   echo $a $b | java addition
donehi there,
currently i have a simple java coding ( a + b ). and i m trying to connect with bash script but this bash script coudln't Enter 2nd value (b=20) while i running for it. may i know how do i can Enter 2 value into it?
output from terminal
[seng@localhost java_class]$ bash addition.sh
=======================================================================
simulation 1
Num_a       = 10
Num_b       = 20
Enter your Num_a : 10
Enter your Num_b : Exception in thread "main" java.lang.NumberFormatException
   at java.lang.Integer.parseInt(java.lang.String, int, boolean) (/usr/lib/libgcj.so.6.0.0)
   at java.lang.Integer.parseInt(java.lang.String) (/usr/lib/libgcj.so.6.0.0)
   at filter_god.GOD(java.util.List, java.util.List, java.lang.String, java.lang.String, int) (Unknown Source)
   at filter_god.main(java.lang.String[]) (Unknown Source)
   at gnu.java.lang.MainThread.call_main() (/usr/lib/libgcj.so.6.0.0)
   at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0)
=======================================================================

That code will send both numbers on a single line in standard input to the java process. So if the process reads standard input, it will get a single line that has this in it: "10 20".
I'm guessing you're sending that whole line to Integer.parseInt. But a valid number doesn't have a space in the middle.
You should split up the line using String.split. Or use a StringTokenizer. Or a regular expression. Or you can use a java.util.Scanner. Or a java.io.StreamTokenizer. Or maybe some other stuff that has slipped my mind at the moment.

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