QA's approach 2 Java - Collections Framework Hierarchy & Important methods available

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Practical way to identify the Hierarchy & What were available methods under them

Assume we wanted to know Hierarchy of ArrayList & the Methods available in it.

Step 1: Create a class extending ArrayList class as follows in Eclispe

package collectionExamples;

import java.util.ArrayList;

public class InheritAbstractList extends ArrayList<Object>{

public static void main(String[] args) {

}

}
//Right click ->Source->Override/Implement methods ->Will display a window to select methods to override/implement



}

Then our class file will now include all the methods available in ArrayList Class as follows

package collectionExamples;

import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Spliterator;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.UnaryOperator;
import java.util.stream.Stream;

public class InheritAbstractList extends ArrayList {

public static void main(String[] args) {
// TODO Auto-generated method stub
AbstractList<?> list = new ArrayList<Object>();
}

@Override
public Stream parallelStream() {
// TODO Auto-generated method stub
return super.parallelStream();
}

@Override
public Stream stream() {
// TODO Auto-generated method stub
return super.stream();
}

@Override
public boolean add(Object e) {
// TODO Auto-generated method stub
return super.add(e);
}

@Override
public void add(int index, Object element) {
// TODO Auto-generated method stub
super.add(index, element);
}

@Override
public boolean addAll(Collection c) {
// TODO Auto-generated method stub
return super.addAll(c);
}

@Override
public boolean addAll(int index, Collection c) {
// TODO Auto-generated method stub
return super.addAll(index, c);
}

@Override
public void clear() {
// TODO Auto-generated method stub
super.clear();
}

@Override
public Object clone() {
// TODO Auto-generated method stub
return super.clone();
}

@Override
public boolean contains(Object o) {
// TODO Auto-generated method stub
return super.contains(o);
}

@Override
public void ensureCapacity(int minCapacity) {
// TODO Auto-generated method stub
super.ensureCapacity(minCapacity);
}

@Override
public void forEach(Consumer action) {
// TODO Auto-generated method stub
super.forEach(action);
}

@Override
public Object get(int index) {
// TODO Auto-generated method stub
return super.get(index);
}

@Override
public int indexOf(Object o) {
// TODO Auto-generated method stub
return super.indexOf(o);
}

@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
return super.isEmpty();
}

@Override
public Iterator iterator() {
// TODO Auto-generated method stub
return super.iterator();
}

@Override
public int lastIndexOf(Object o) {
// TODO Auto-generated method stub
return super.lastIndexOf(o);
}

@Override
public ListIterator listIterator() {
// TODO Auto-generated method stub
return super.listIterator();
}

@Override
public ListIterator listIterator(int index) {
// TODO Auto-generated method stub
return super.listIterator(index);
}

@Override
public Object remove(int index) {
// TODO Auto-generated method stub
return super.remove(index);
}

@Override
public boolean remove(Object o) {
// TODO Auto-generated method stub
return super.remove(o);
}

@Override
public boolean removeAll(Collection c) {
// TODO Auto-generated method stub
return super.removeAll(c);
}

@Override
public boolean removeIf(Predicate filter) {
// TODO Auto-generated method stub
return super.removeIf(filter);
}

@Override
protected void removeRange(int fromIndex, int toIndex) {
// TODO Auto-generated method stub
super.removeRange(fromIndex, toIndex);
}

@Override
public void replaceAll(UnaryOperator operator) {
// TODO Auto-generated method stub
super.replaceAll(operator);
}

@Override
public boolean retainAll(Collection c) {
// TODO Auto-generated method stub
return super.retainAll(c);
}

@Override
public Object set(int index, Object element) {
// TODO Auto-generated method stub
return super.set(index, element);
}

@Override
public int size() {
// TODO Auto-generated method stub
return super.size();
}

@Override
public void sort(Comparator c) {
// TODO Auto-generated method stub
super.sort(c);
}

@Override
public Spliterator spliterator() {
// TODO Auto-generated method stub
return super.spliterator();
}

@Override
public List subList(int fromIndex, int toIndex) {
// TODO Auto-generated method stub
return super.subList(fromIndex, toIndex);
}

@Override
public Object[] toArray() {
// TODO Auto-generated method stub
return super.toArray();
}

@Override
public Object[] toArray(Object[] a) {
// TODO Auto-generated method stub
return super.toArray(a);
}

@Override
public void trimToSize() {
// TODO Auto-generated method stub
super.trimToSize();
}

@Override
public boolean equals(Object o) {
// TODO Auto-generated method stub
return super.equals(o);
}

@Override
public int hashCode() {
// TODO Auto-generated method stub
return super.hashCode();
}

@Override
public boolean containsAll(Collection c) {
// TODO Auto-generated method stub
return super.containsAll(c);
}

@Override
public String toString() {
// TODO Auto-generated method stub
return super.toString();
}

@Override
protected void finalize() throws Throwable {
// TODO Auto-generated method stub
super.finalize();
}

}


Step 2: Click F4 from within the class, on the right side, Class Hierarchy will be displayed


Step 3: To get to know all the methods under inviduals, select on the individual types

                  



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