Java集合练习4-4，烦请老师检查和指正～

//定义HashMap的对象并添加数据
	       Map < Integer, String> champion = new HashMap <Integer, String> ();
	       System.out.println("Please enter keys and values:");
	       Scanner console = new Scanner(System.in);
	       int i = 0;
	       while(i < 3){
	           System.out.println("Please enter keys:");
	           int key = console.nextInt();
	           System.out.println("Please enter values:");
	           String value = console.next();
	           champion.put(key, value);
	           i++;

	       }

			//使用迭代器的方式遍历
			System.out.println("Display all the data by iterator:");
			Iterator <String> it = champion.values().iterator();
			while(it.hasNext()){
			    System.out.print(it.next() + "  ");
			}

			//使用EntrySet同时获取key和value
			Set <Entry <Integer, String>> entrySet = champion.entrySet();
			System.out.println("Display both keys and values:");
			for(Entry <Integer,String> entry: entrySet){
			    System.out.print(entry.getKey() + "-" );
			    System.out.print(entry.getValue());
			}