冗余代码

	public static Node reverseNode(Node node){
		Node newHead=null;
		while(node!=null){			
			Node temp=node;
			node.setNext(newHead);
			newHead=node;
			if(node.getNext()!=null){
				node=temp.getNext();
			}else{
				node=null;
			}
		}
		return newHead;
	}

if node==null is true, then return null;

if node!=null is true, then  enter the loop:

      if node.getNext()!=null is true, then the node=node.getNext() after one loop.

             if node.getNext()==null is ture, then the code node.setNext(newHead) will make node.getNext()！=null, but the code with if-else will make node null.

      if node.getNext()==null is ture, newHead is null, the code without if-else will also make node null.

if-else语句可以换成

node=temp.getNext();

if-else 的作用是node=node.getNext(); 而进入循环前已经判定node不为null.