5.24笔记

无法返回set，建一个Arraylist存储；
return new ArrayList(set)

拷贝节点
mapping.put(n, new UndirectedGraphNode(n.label))

拷贝边
先找节点
for (UndirectedGraphNode n : nodes) {
UndirectedGraphNode newNode = mapping.get(n);
再找neighbour
for (UndirectedGraphNode neighbor : n.neighbors) {
UndirectedGraphNode newNeighbor = mapping.get(neighbor);

字符串判断相等一定是.equal()!!!

char c = ‘a’; c <= ‘z’; c++ a到z字符遍历；
‘’ char类 “” string类

处理String类型： 不能直接改!!!
建一个char[] 数组 char[] chars= string.toCharArray();