A）在MyList中定义以下方法，并在MyAbstractList中实现它。
// Adds the elements in otherList to this list.
// Returns true if
// this list changed as a result of the call.
public boolean addAll(MyList<E> otherlist)
B）将代码添加到“TestMyArrayList.java”以证明此方法正常工作。
使用java.util.Iterator对象和while循环显示修改后的列表。
好的，所以我已经完成了A部分，我在B部分感到困惑。我不明白我的教授希望我做什么。我已经做了一些东西，但我很确定它不正确。有人知道我是否正确地做到了吗？
这是我的MyList类
package listapi;
/**
* @author Y. Daniel Liang
*/
public interface MyList<E> extends java.lang.Iterable<E> {
/** Add a new element at the end of this list*/
public void add(E e);
/**Add a new element at the specified index in this list*/
public void add(int index, E e);
/**Clear the list*/
public void clear();
/**Return true if this list contains the element*/
public boolean contains(E e);
/**Return the element from this list at the specified index*/
public E get(int index);
/**Return the index of the first matching element in this list. Return -1 if
* no match.*/
public int indexOf(E e);
/**Return true if this list contains no elements*/
public boolean isEmpty();
/**Return the index of the last matching element in this list Return -1 if
* no match.*/
public int lastIndexOf(E e);
/**Remove the first occurrence of the element o from this list. Shift any
* subsequent elements to the left. Return true if the element is removed.*/
public boolean remove(E e);
/**Remove the element at the specified position in this list Shift any
* subsequent elements to the left. Return the element that was removed from
* the list.*/
public E remove(int index);
/**Replace the element at the specified position in this list with the
* specified element and returns the new set.*/
public Object set(int index, E e);
/** Return the number of elements in this list */
public int size();
public boolean addAll(MyList<E> otherList);
}
这是我的MyAbstractList类
package listapi;
/**
* @author Y. Daniel Liang
*/
public abstract class MyAbstractList<E> implements MyList<E> {
protected int size = 0; // The size of the list
/**
* Create a default list
*/
protected MyAbstractList() {
}
/**
* Create a list from an array of objects
*/
protected MyAbstractList(E[] objects) {
for (int i = 0; i < objects.length; i++) {
add(objects[i]);
}
}
@Override
/**
* Add a new element at the end of this list
*/
public void add(E e) {
add(size, e);
}
@Override
/**
* Return true if this list contains no elements
*/
public boolean isEmpty() {
return size == 0;
}
@Override
/**
* Return the number of elements in this list
*/
public int size() {
return size;
}
@Override
/**
* Remove the first occurrence of the element e from this list. Shift any
* subsequent elements to the left. Return true if the element is removed.
*/
public boolean remove(E e) {
if (indexOf(e) >= 0) {
remove(indexOf(e));
return true;
} else {
return false;
}
}
public boolean addAll(MyList<E> otherList) {
for (E e : otherList) {
add(e);
}
if (otherList.size() > 0)
return true;
return false;
}
}
这是我需要添加代码以通过使用java.lang.iterator和while循环显示修改后的列表来证明我的addAll方法正常工作的地方
package listapi;
/**
* @author Y. Daniel Liang
*/
public class TestMyArrayList {
public TestMyArrayList() {
// Create a list
MyList<String> list = new MyArrayList<>();
// Add elements to the list
list.add("America"); // Add it to the list
System.out.println("(1) " + list);
list.add(0, "Canada"); // Add it to the beginning of the list
System.out.println("(2) " + list);
list.add("Russia"); // Add it to the end of the list
System.out.println("(3) " + list);
list.add("France"); // Add it to the end of the list
System.out.println("(4) " + list);
list.add(2, "Germany"); // Add it to the list at index 2
System.out.println("(5) " + list);
list.add(5, "Norway"); // Add it to the list at index 5
System.out.println("(6) " + list);
// Remove elements from the list
list.remove("Canada"); // Same as list.remove(0) in this case
System.out.println("(7) " + list);
list.remove(2); // Remove the element at index 2
System.out.println("(8) " + list);
list.remove(list.size() - 1); // Remove the last element
System.out.print("(9) " + list + "\n(10) ");
for (String s : list) {
System.out.print(s.toUpperCase() + " ");
}
Iterator itr = list.iterator();
while(itr.hasNext()){
Object a = itr.next();
System.out.println(a);
}
public static void main(String[] args){
new MyArrayList();
}
}