Java How to Iterate Map

常用iterate 方法

Map<Integer, String> m = new HashMap<Integer, String>();
for(Map.Entry<Integer, String> entry : m.entrySet()){
    System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
}


Iterator<Map.Entry<Integer, String>> iterator = m.entrySet().iterator();
while(iterator.hasNext()){
    Map.Entry entry = iterator.next();
    System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
}

for(Character key : hm.keySet()){
    System.out.println("Key: " + key + " Value: " + hm.get(key));
}