CodePudding user response:

 
//1 
Public static void main (String [] args) {
Map The map=new LinkedHashMap<> (a); 
The map. The put (" zhou yu ", "Joe"); 
The map. The put (" sun quan ", "big Joe"); 
The map. The put (" Yang guo, "" little dragon female"); 
The map. The put (" lyu3 bu4, "" the sable cicada"); 
Iterator The iterator=map. KeySet (). The iterator (); 
While (iterator. HasNext ()) {
String key=iterator. Next (); 
The String value=https://bbs.csdn.net/topics/map.get (key); 
System. The out. Println (key + "-- -- -- -- --" + value); 
} 
} 

The second question//
Public static void main (String [] args) {
List List=Arrays. AsList (4,5,12,56,23,89,15); 
The Collections. The sort (list, new Comparator () {
@ Override 
Public int the compare (Integer o1, o2) Integer {
Return o1, o2. 
} 
}); 
System. Out. Println (list); 
}