問題：

實(shí)現(xiàn)單鏈表反轉(zhuǎn)

答案：

鏈表準(zhǔn)備

class Node {private int Data;// 數(shù)據(jù)域private Node Next;// 指針域public Node(int Data) {// super();this.Data = Data;}public int getData() {return Data;}public void setData(int Data) {this.Data = Data;}public Node getNext() {return Next;}public void setNext(Node Next) {this.Next = Next;} } public static void main(String[] args) {Node head = new Node(0);Node node1 = new Node(1);Node node2 = new Node(2);Node node3 = new Node(3);head.setNext(node1);node1.setNext(node2);node2.setNext(node3);// 打印反轉(zhuǎn)前的鏈表Node h = head;while (null != h) {System.out.print(h.getData() + " ");h = h.getNext();}// 調(diào)用反轉(zhuǎn)方法head = reverse(head);System.out.println("\n**************************");// 打印反轉(zhuǎn)后的結(jié)果while (null != head) {System.out.print(head.getData() + " ");head = head.getNext();}}

遞歸反轉(zhuǎn)法：在反轉(zhuǎn)當(dāng)前節(jié)點(diǎn)之前先反轉(zhuǎn)后續(xù)節(jié)點(diǎn)。這樣從頭結(jié)點(diǎn)開始，層層深入直到尾結(jié)點(diǎn)才開始反轉(zhuǎn)指針域的指向。簡(jiǎn)單的說就是從尾結(jié)點(diǎn)開始，逆向反轉(zhuǎn)各個(gè)結(jié)點(diǎn)的指針域指向

private static Node reverse1(Node head) {if(head==null||head.getNext()==null){return head;}Node reHead = reverse1(head.getNext());head.getNext().setNext(head);head.setNext(null);return reHead;}

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遍歷反轉(zhuǎn)法：遞歸反轉(zhuǎn)法是從后往前逆序反轉(zhuǎn)指針域的指向，而遍歷反轉(zhuǎn)法是從前往后反轉(zhuǎn)各個(gè)結(jié)點(diǎn)的指針域的指向

private static Node reverse2(Node head) {if(head==null){return head;}Node pre = head;Node cur = head.getNext();Node temp;while (cur!=null) {temp = cur.getNext();cur.setNext(pre);pre = cur;cur=temp;}head.setNext(null);return pre;}

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