线性表 顺序存储 链式存储 ---java实现

public abstract class MyAbstractList<E> {
public abstract void add(E t);
public abstract void add(int index,E t);
public abstract void remove();
public abstract void remove(int index);
public abstract int getCount();
public abstract E get(int index);
public abstract String toString();
public abstract boolean contains(E e);
}

public class ArrayList2<E> extends MyAbstractList<E>{
private E[] e;
private int len;
private int size;

ArrayList2(){
this.size = 0;
this.len = 10;
this.e =  (E[]) new Object[len];
}

@Override
public void add(E t) {
// TODO Auto-generated method stub
ensureCap();
e[size] = t;
size++;
}

private void ensureCap() {
// TODO Auto-generated method stub
if(getCount()>=len){
E[] temp = (E[]) new Object[len*2+1];
len = len*2+1;
for(int i=0;i<len;i++){
temp[i] = e[i];
}
}
}

@Override
public void add(int index, E t) {
// TODO Auto-generated method stub
ensureCap();
for(int i=size-1;i>=index;i--){
e[i+1] = e[i];
}
e[index] = t;
size++;
}

@Override
public void remove() {
// TODO Auto-generated method stub
e[size] = null;
size--;
}

@Override
public void remove(int index) {
// TODO Auto-generated method stub
for(int i=index;i<size-1;i++){
e[index]  = e[index+1];
}
e[size] = null;
size--;
}

@Override
public E get(int index){
if(index>0 && index<size){
return e[index];
}
else return null;
}

public boolean isEmpty(){
return size>0? false : true;
}

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

@Override
public String toString(){
StringBuffer sb  = new StringBuffer();
sb.append("[");
for(int i=0;i<size-1;i++){
sb.append(e[i]).append(",");
}
sb.append(e[size-1]);
sb.append("]");
return sb.toString().trim();
}

@Override
public boolean contains(E e1){
boolean bool = false;
for(int i=0;i<size;i++){
if(e[i] == e1){
bool = true;
}
}

return bool;
}

}

public class LinkedList2<E> extends MyAbstractList<E> {

private int size;
private Node<E> head;

public LinkedList2(){
this.size = 0;
head = null;
}
@Override
public void add(E t) {
// TODO Auto-generated method stub
Node<E> e = new Node<E>(t);
if(size == 0) head = e;
else{
Node temp = head;
while(temp.next!=null){
temp = temp.next;
}
temp.next = e;
size++;
}
}

@Override
public void add(int index, E t) {
// TODO Auto-generated method stub
if(index == 0 || index>size) add(t);
else{
Node current = head;
Node<E> e = new Node<E>(t);
for(int i=0;i<index-1;i++){
current = current.next;
}
e.next = current.next;
current.next = e;
size++;
}
}

@Override
public void remove() {
// TODO Auto-generated method stub
remove(size-1);
}

@Override
public void remove(int index) {
// TODO Auto-generated method stub
if(index == 0)  removeFirst();
else if(index == size)  removeLast();
else if(index<0 || index>size) ;
else{
Node<E> pre = head;
for(int i=0;i<index-1;i++){
pre = pre.next;
}
Node<E> current = pre.next;
pre.next = current.next;
size--;
}
}

private void removeLast() {
// TODO Auto-generated method stub
if(size == 0) ;
else{
Node<E> current = head;
for(int i=0;i<size-2;i++){
current = current.next;
}
current.next = null;
size--;
}
}
private void removeFirst() {
// TODO Auto-generated method stub
head = head.next;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return size;
}

@Override
public E get(int index) {
// TODO Auto-generated method stub
Node<E> current = head;
for(int i=0;i<index-1;i++){
current = current.next;
}
return current.e;
}

@Override
public String toString() {
// TODO Auto-generated method stub
StringBuffer sb = new StringBuffer();
sb.append("[");
Node<E> current = head;
for(int i=0;i<size;i++){
sb.append(current.e).append(",");
}
sb.append("]");
return sb.toString().trim();
}

@Override
public boolean contains(E e) {
// TODO Auto-generated method stub
if(size == 0 ) return false;
else{
Node<E> current = head;
for(int i=0;i<size-1;i++){
if(current.e == e) return true;
current = current.next;
}
return false;
}

}

}

/**
* 链表结点
*/
class Node<E>{
E e;
Node<E> next;
Node(){
this.next = null;
}
Node(E ee){
e = ee;
next = null;
}
}