Question

PLEASE EDIT THE LAST 3 METHODS WHERE I PUT STARS AND DO WHAT THE COMMENTS SAY. THE CODE IS IN JAVA PROGRAMMING LANGUAGE.

import java.util.AbstractList;
import java.util.List;
import java.util.RandomAccess;
import java.lang.RuntimeException;
import java.util.Arrays;

public class Vector<E> extends AbstractList<E> implements List<E>, RandomAccess {
  
protected Object[] data;
protected int size;

public int size() {
    return size;
}
  
private void rangeCheck(int index) {
    if (index < 0 || index >= size)
throw new IndexOutOfBoundsException("");
}
  
@SuppressWarnings("unchecked")
private E data(int index) {
return (E) data[index];
}
  
private void grow() {
int newCapacity = data.length*2;
    data = Arrays.copyOf(data, newCapacity);
}
  
public Vector() {
   this(10);
}
  
public Vector(int initialCapacity) {
    data = new Object[initialCapacity];
size = 0;
}
  
public E get(int index) {
rangeCheck(index);
return data(index);
}
  
public E set(int index, E element) {
rangeCheck(index);
E oldValue = data(index);
    data[index] = element;
   return oldValue;
}
  
public boolean add(E element) {
    if (size == data.length) grow();
data[size++] = element;
return true;
}
  
public void add(int index, E element) {

**************************************
       // Add element at index.
}
  
public E remove(int index) {
  
*********************************

// Return the removed element
}
  
   public int indexOf(Object o) {

*****************************************
       // Returns the index of the first occurrence of the specified element
       // in this list, or -1 if this list does not contain the element.
}
  
public static void main(String[] args) {
   Vector<Integer> intlist = new Vector<Integer>();
Vector<String> stringlist = new Vector<String>();
Vector<Vector<Integer>> intveclist = new Vector<Vector<Integer>>();

       for (Integer i = 0; i < 10; i++) {
               intlist.add(i);
       }

       System.out.println(intlist.indexOf(7));
       System.out.println(intlist.indexOf("seven"));
}
}

Answer 1

import java.util.AbstractList;
import java.util.Arrays;
import java.util.List;
import java.util.RandomAccess;

public class Vector<E> extends AbstractList<E> implements List<E>, RandomAccess {
  
protected Object[] data;
protected int size;

public int size() {
return size;
}
  
private void rangeCheck(int index) {
if (index < 0 || index >= size)
throw new IndexOutOfBoundsException("");
}
  
@SuppressWarnings("unchecked")
private E data(int index) {
return (E) data[index];
}
  
private void grow() {
int newCapacity = data.length*2;
data = Arrays.copyOf(data, newCapacity);
}
  
public Vector() {
this(10);
}
  
public Vector(int initialCapacity) {
data = new Object[initialCapacity];
size = 0;
}
  
public E get(int index) {
rangeCheck(index);
return data(index);
}
  
public E set(int index, E element) {
rangeCheck(index);
E oldValue = data(index);
data[index] = element;
return oldValue;
}
  
public boolean add(E element) {
if (size == data.length) grow();
data[size++] = element;
return true;
}
  
public void add(int index, E element) {
   rangeCheck(index);
   int i=data.length-1;
   if((size == data.length-1))
       grow();
   // shifting element to the right
   for(;i>index;i--){
       data[i]=data[i-1];
   }
       data[index]=element;
// Add element at index.
}
  
public E remove(int index) {
   rangeCheck(index);
   E e = (E) data[index];
   // shifting elements to left
   for(int i=index;i<data.length-1;i++){
       data[i]=data[i+1];
   }
   return e;

// Return the removed element
}
  
public int indexOf(Object o) {

   for(int i=0;i<data.length;i++){
       if(o.equals(data[i]))
           return i;
   }
   return -1;
// Returns the index of the first occurrence of the specified element
// in this list, or -1 if this list does not contain the element.
}
  
public static void main(String[] args) {
Vector<Integer> intlist = new Vector<Integer>();
Vector<String> stringlist = new Vector<String>();
Vector<Vector<Integer>> intveclist = new Vector<Vector<Integer>>();

for (Integer i = 0; i < 10; i++) {
intlist.add(i);
}

System.out.println(intlist.indexOf(7));
System.out.println(intlist.indexOf("seven"));
}
}