read the equation in java

[hi1806]

Hello,
can someone help me, i need in java for example:
3y1 + 2y2 - 3y3 < 9

I need the single valued from y1 to y3 and the number after "<" operand in variablen, also the operand (+,-,<,>, Etc.) so that this problem be solved.
It should be dynamic, not static

How I can make in java that it is read single component and then stored.

*Note: it can be from y1,y2,y3,...,yn
*Note: The operation (+,-)
*Note: The operation before number (<,>,<=,>=)