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Merge pull request #205 from yangZ5/master

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Update 删除多余：，添加//注释
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SnailClimb 2019-03-12 21:19:44 +08:00 committed by GitHub
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Java/LinkedList.md
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@ -186,7 +186,7 @@ public void addLast(E e) {
}
```
### <font face="楷体" id="3.3">根据位置取数据的方法</font>
**get(int index)：**：根据指定索引返回数据
**get(int index)：** 根据指定索引返回数据
```java
public E get(int index) {
//检查index范围是否在size之内
@ -220,7 +220,7 @@ public E peekFirst() {
getFirst(),element(),peek(),peekFirst()
这四个获取头结点方法的区别在于对链表为空时的处理，是抛出异常还是返回null，其中**getFirst()** 和**element()** 方法将会在链表为空时，抛出异常
element()方法的内部就是使用getFirst()实现的。它们会在链表为空时，抛出NoSuchElementException
element()方法的内部就是使用getFirst()实现的。它们会在链表为空时，抛出NoSuchElementException
**获取尾节点（index=-1）数据方法:**
```java
public E getLast() {
@ -359,7 +359,7 @@ E unlink(Node<E> x) {
//删除前驱指针
if (prev == null) {
first = next;如果删除的节点是头节点,令头节点指向该节点的后继节点
first = next;//如果删除的节点是头节点,令头节点指向该节点的后继节点
} else {
prev.next = next;//将前驱节点的后继节点指向后继节点
x.prev = null;