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a) Define your class to be Generic


public class TestModel<K>{


b) no need for the generic near the public


public void add(K fieldType, K value)//remove the 'public<K>'

May or may not suit this scenario, but you could extend one of the types from the other


public class MyClass<V, T extends V>{
///my class
public void function(V v, T t){

}
}