Condition String Resolver in java API?

I would like to resolve the following condtion string. Because I would like to support dynamic condtion in my project.

a != 0 && b > 5

My expected Program is

public boolean resolve() {
    String condition = "a != 0 && b > 5";
    Map<String, Object> paramMap = new HashMap<String, Object>;
    paramMap.put("a", 2);
    paramMap.put("b", 6);
    boolean result = ConditionResolver.resolve(condition, paramMap);
    if(result) {
        //do something
    }
} 

Update :

I am not trying to resolve the math equation, like below

((a + b) * y) /x