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What is the root interface of Collection hierarchy in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 3/10 Helpfulness 1/10

answer What is the root interface of Collection hierarchy in Java?

What is the root interface of Collection hierarchy in Java?

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The root interface of Collection hierarchy in Java is Collection

interface.

But the Collection interface extends Iterable interface. Due to this

some people consider Iterable interface as the root interface.

Iterable interface is present in java.lang package but Collection

interface is present in java.util package. Oracle Java API docs

mention that Collection interface is a member of the Java

Collections framework.

Whereas, Iterable interface is not stated as a part of Java

Collections framework in Java docs.

Due to this Collection interface is the root of Collections

Framework

public class JDK11CollectionFunctions {

	public static void main(String[] args) {

		/*
		 * JDK 11 New Method in Collection interface 
		 * default <T> T[] toArray(IntFunction<T[]> generator) {
		 * return toArray(generator.apply(0)); }
		 */

		List<String> strList = new ArrayList<>();
		strList.add("Java");
		strList.add("Python");
		strList.add("Android");

		String[] strArray = strList.toArray(size -> new String[size]);
		System.out.println(Arrays.toString(strArray));

		strArray = strList.toArray(size -> new String[size + 5]);
		System.out.println(Arrays.toString(strArray));

		strArray = strList.toArray(size -> new String[size * 3]);
		System.out.println(Arrays.toString(strArray));
	}

}

https://www.digitalocean.com/community/tutorials/collections-in-java-tutorial

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: hierarchy interface java root

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What is the root interface of Collection hierarchy in Java?

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