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//HashMap的循环，如果既需要key也需要value，直接用
Map<String, String> map = new HashMap<String, String>();
for (Entry<String, String> entry : map.entrySet()) {
	entry.getKey();
	entry.getValue();
}

//如果只是遍历key而无需value的话，可以直接用
Map<String, String> map = new HashMap<String, String>();
for (String key : map.keySet()) {
	// key process
}