A HashMap<Integer, Integer>有10个条目，但我只想打印3个条目.
代码:
HashMap<Integer,Integer> hm = new HashMap<Integer,Integer>();
hm.put(2, 1);
hm.put(5, 3);
hm.put(7, 2);
hm.put(4, 1);
hm.put(6, 3);
hm.put(8, 2);
hm.put(9, 1);
hm.put(3, 3);
hm.put(1, 2);
hm.put(0, 2);
Iterator <Map.Entry<Integer, Integer>> itr = hm.entrySet().iterator();
int n=4;
int i=0;
while(itr.hasNext()){
if(i<n){
Map.Entry<Integer, Integer> entry = itr.next();
System.out.println(entry.getKey()+" repeated "+entry.getValue());
}
i++;
}
输出
0 repeated 2
1 repeated 2
2 repeated 1
3 repeated 3 //program will wait for 2 or 3 seconds here
4 repeated 1
5 repeated 3
6 repeated 3
7 repeated 2
8 repeated 2
9 repeated 1
预期输出:
0 repeated 2
1 repeated 2
2 repeated 1
3 repeated 3
为什么While循环内部的if条件不起作用？