public static void main(String[] args) throws IOException,ParseException {
Map<String,String> m = new HashMap<String,String>();
m.put("1", "haha");
m.put("2", "hehe");
m.put("3", "heihei");
//第一种
for(String k : m.keySet())
{
System.out.println(k+m.get(k));
}
//第二种
for(Map.Entry<String, String> d:m.entrySet())
{
System.out.println(d.getValue()+d.getKey());
}
//第三种
Set<String> x = m.keySet();
Iterator it = x.iterator();
while(it.hasNext())
{
String u = (String) it.next();
System.out.println(u+m.get(u));
}
//第四种
Set<Map.Entry<String, String>> y = m.entrySet();
Iterator<Map.Entry<String, String>> it1 = m.entrySet().iterator();
while(it1.hasNext())
{
Map.Entry<String, String> en = it1.next();
System.out.println(en.getKey()+en.getValue());
}
}