Why does List interface extend Collection interface?

Why does List interface extend Collection interface?

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Why does List interface extend Collection interface?
Tag : java , By : George H.
Date : November 24 2020, 03:41 PM

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Why does Map not extend Collection interface

Tag : java , By : David B
Date : March 29 2020, 07:55 AM
this one helps. Collection assume elements of one value. Map assumes entries of key/value pairs. They could have been engineered to re-use the same common interface however some methods they implement are incompatible e.g.
Collection.remove(Object) - removes an element.
Map.remove(Object) - removes by key, not by entry.

How to extend an interface with object resulting in new interface with object props merged into interface prototype?

Tag : typescript , By : user157138
Date : March 29 2020, 07:55 AM
I wish this help you You can indeed do this but you need to specify that the type of the value being intersected with the xtn object is a constructor that instantiates the resulting values.
The signature of extend therefore should look like
function extend<T, K>(cls: new (...args: {}[]) => T, xtn: K): new (...args: {}[]) => T & K;
function extend<T, K>(cls: (...args: {}[]) => T, xtn: K): new (...args: {}[]) => T & K;
function extend<T, K>(cls: new (...args: {}[]) => T, xtn: K): new (...args: {}[]) => T & K;

Does a class which implements an interface's method (without explicitly implementing that interface) extend that specifi

Tag : java , By : user186831
Date : March 29 2020, 07:55 AM
should help you out Yes, it is right. Java doesn't use duck-typing as JavaScript or TypeScript.
A solution is to create an adapter class that wraps a Integer, delegates to it, and actually implement the interface.
public interface HasDoubleValue{
    double doubleValue();

final class IntegerHasDoubleValueAdapter implements HasDoubleValue {
    private final Integer i;

    public IntegerHasDoubleValueAdapter(Integer i) {
        this.i = i;

    public double doubleValue() {
        return i.doubleValue();

class Data<O extends HasDoubleValue> {
    void put(O o) {}

    public static void main(String[] args) {
        Integer i = 42;

        Data<IntegerHasDoubleValueAdapter> d1 = new Data<>();
        d1.put(new IntegerHasDoubleValueAdapter(i));

        Data<HasDoubleValue> d2 = new Data<>();
        d2.put(() -> i.doubleValue());

        Data<HasDoubleValue> d3 = new Data<>();

In java, is an interface providing parameters to extend a parameterized interface an exact synonym of it?

Tag : java , By : yew tree
Date : March 29 2020, 07:55 AM
may help you . What you are looking for is called a type alias.
Java unfortunately does not have them.

Why methods in Collection interface are again declared in List Interface though List extends Collection

Tag : java , By : Nandor Devai
Date : March 29 2020, 07:55 AM
hope this fix your issue A method in a sub-interface may have different behavior (or at least a more specific behavior) than a method of the super interface having the exact same signature.
Therefore, it is very useful, for example, for the users of the List interface to know that add
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