writing some rules out of java basic program with specific condition and run related rule if condition is satisfied

Question

I am new to java, I have a class HashSet<Proposition>Propositions,

class Proposition have 4 class Variable:

public class Proposition extends HashSet<Proposition> implements RSTNode{
private String productName;
    private Property     property;
    private Serializable value;
    private Type         type;
    private Rating       rating;
}

and class Propositions is as follow:

public class Propositions extends ArrayList<Proposition>{ 
........
}

I have class RST Rule as follow:

public class RSTRule{
    protected String ruleName;
    protected String discourseRelation;
    protected RSTNode nucleus;
    protected RSTNode satellite;
    protected Condition condition;
    int heuristic;
    }

now i have another class namely RSTRules, which contains some methods such as generate_1(),generate_2(),... in this methods i want to write some condition in field condition, which if this condition is true then i should run the related generate methode but if condition is not true i should go to another generate methode and check it's condition an so on, I thought for this propblem i should have a seperate class namely "Condition" to check condition, but i do not know how should write the methods in Condition Class or Constructors also, that means my Condition Class is empty now!!!!!!

public class RSTRules extends ArrayList<RSTRule>  {
    RSTRule rstRule=new RSTRule();            
    Proposition prop1= new Proposition();
    Proposition prop2= new Proposition();   

    public RSTRule generate_1(){    
    my condition for generate_1() is like this:if(prop1.getName().equals.prop2.getName();
       rstRule.condition=.....
       rstRule.satellite=propSat;
       rstRule.nucleus=propNuc;
       rstRule.ruleName="BothSatisfy_ProductsSimilarities"
       rstRule.discourseRelation="Similarity"
       rstRule.heuristic=10;
       return rstRule;
    }



    public RSTRule generate_2(){
    my condition for generate_2() is like this: if(prop1.getValue().equals.prop2.getValue()

    rstRule.condition=.....
    rstRule.satellite=propSat;
    rstRule.nucleus=propNuc;
    rstRule.ruleName="BothFunction"
    rstRule.discourseRelation="Similarity"
    rstRule.heuristic=10;
    return rstRule;
    }
}