迭代輸出Map鍵值對的幾種方法

Map<String,String> mymap = new HashMap<String,String>();

mymap.put("x1", "y1");
mymap.put("x2", "y2");
mymap.put("x3", "y3");

Iterator it = mymap.entrySet().iterator();

while(it.hasNext()){
Map.Entry entry = (Map.Entry) it.next();
System.out.println(entry.getKey()+":"+entry.getValue());
}

for(Map.Entry entry:mymap.entrySet()){
System.out.println(entry.getKey()+"="+entry.getValue()); 
}

for(String str:mymap.keySet()){ 
System.out.println(str+"|"+mymap.get(str)); 
}