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javagenericswildcardinsertion

Adding a generic of variable datatype to a set Java

This is an example of what I want to do:

Class Example {
    private Set<A> setA = new HashSet<A>();
    private Set<B> setB = new HashSet<B>();


    //setters/getters

    . . .


    // this method is where I don't know what to put
    public boolean addToList(Set<?> set, <?> generic){
          set.add(generic)
    }

    public static void main(String[] args){
         Example ex = new Example();
         ex.addToList(ex.getSetA(), new A());
         ex.addToList(ex.getSetB() new B());
    }
}

I want to write a method to execute over sets of different datatypes. I find that this will be a little more practical than writing add/get/remove methods for each of a dozen sets.

Is there a way to do this in Java?

Solution

  • I think you need parameterized method

    public <T> boolean addToList(Set<T> set, T generic){
      set.add(generic)
}