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Generic Java 5 method that can take either a Class or a Collection?


By : Dima Chammas
Date : October 18 2020, 11:12 AM
this will help Refactor the 2 methods to a single private method taking an Object argument or whatever global type it is actually expecting and let the both public methods call it. E.g.
code :


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Generic collection as a Java method argument


By : micola
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Make a generic method
code :
public static <T> void change( List<T> list, int position1, int position2) {
    T obj = list.get(position1);
    list.set(position1, list.get(position2));
    list.set(position2, obj);
}

Tricky Java Generics : generic class implementing non generic interface with generic Method


By : Galal Elshery
Date : March 29 2020, 07:55 AM
I hope this helps you . I have the following code as seen in ideone.com:
code :
class MyVisitor<T> implements Visitor{
    List<T> list = new  ArrayList<T>();

    public <T> void visit(T value){
       list.add(value);
    }
}
class MyVisitor<T> implements Visitor{
    List<T> list = new  ArrayList<T>();

    public <V> void visit(V value){
       list.add(value);
    }
}
interface Visitor<V>{
    public void visit(V Value);
}
interface Visitor{
    public void visit(Object Value);
}

Set not applicable for Collection in generic method with Java


By : Ivan Lasamahu
Date : March 29 2020, 07:55 AM
wish helps you Just as a List is not a List, a Map> is not a Map> and it's not a Map>.
The solution here is to add a wildcard in place of Set to allow a subclass in the generic type parameter.
code :
//                                                   Add v
public static <V> List<V> sortedValuesFromMap(Map<?, ? extends Collection<V>> keysValues,
    Comparator<V> comp) {

Java generic method to find 'max' object from collection using compareTo method problem


By : Encoded
Date : March 29 2020, 07:55 AM
will be helpful for those in need List means "a List. We don't know a List of what, but whatever it is, we do know that it extends T or is T itself."
One effect of this is that when we take an element from the List, the compiler will know it as of type T. The actual runtime class of the item may be a subtype of T, as is always the case with polymorphism, but no one cares about that. We know it can be stored in a variable type T.

How do you get an instance of java.lang.Class for a generic collection like Collection<SomeObject>?


By : Paula Melo
Date : October 18 2020, 11:12 PM
hop of those help? You can't. Type erasure means that you can't do this this way.
What you can do is:
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