首页 > itarticle > java-map的遍历

java-map的遍历

admin 11月 13, 2020 0

Map<Integer, Integer> map = new HashMap<>();
map.put(0, 0);
map.put(1, 111);
map.put(3, 333);
map.put(2, 222);

通过entrySet

for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
  System.out.print(entry); 
  System.out.println("  Key:" + entry.getKey() + "  Value:" + entry.getValue());
}

通过keySet与values

for (Integer key : map.keySet()) {    
  System.out.println(key);
}

for (Integer value : map.values()) {    
  System.out.println(value);
}

通过Iterator

Iterator<Map.Entry<Integer, Integer>> entries = map.entrySet().iterator();
while (entries.hasNext()) {        
  System.out.println(entries.next());
}