遍历HashMap的问题
遍历一个HashMap，要求时间复杂度尽可能小。


[解决办法]
Map map = new HashMap();
Iterator iter = map.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
Object key = entry.getKey();
Object val = entry.getValue();
}

[解决办法]
效率高

Java code

Map map = new HashMap();Iterator iter = map.entrySet().iterator();while (iter.hasNext()) {    Map.Entry entry = (Map.Entry) iter.next();    Object key = entry.getKey();    Object val = entry.getValue();}