1 使用entrySet
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("Robert", 34);
map.put("Kiran", 29);
map.put("Andy", 44);
for(Map.Entry<String,Integer> entry : map.entrySet())
{
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}
2 使用keySet
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("Robert", 34);
map.put("Kiran", 29);
map.put("Andy", 44);
for(String key : map.keySet())
{
System.out.println(key);
System.out.println(map.get(key));
}
3 使用Iterator
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("Robert", 34);
map.put("Kiran", 29);
map.put("Andy", 44);
Iterator<Entry<String,Integer>> iterator = map.entrySet().iterator();
while(iterator.hasNext())
{
Entry<String,Integer> entry = iterator.next();
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}