Question

java中怎么遍历HashMap

Answer 1

可以遍历 map 的 entrySet 和 keySet
entrySet 的如

Set<Map.Entry<String, String>> entryseSet=map.entrySet();
for (Map.Entry<String, String> entry:entryseSet) {
System.out.println(entry.getKey()+","+entry.getValue());
}

keySet的是
Set<String> set = map.keySet();
for (String s:set) {
System.out.println(s+","+map.get(s));
}

Answer 2

先得到key

再逐个取value

for(Iterator it =map.keySet().iterator(); it.hasNext(); ){
Object value = map.get(it.next());
}

另一种方法是直接枚举
entrySet()