英文:
How can I get two keys with duplicate values and print it?
问题
Sure, here's the translated content:
我有一个针对 **LinkedHashMap** 的方法 `getKeyFromValue`，我想从该映射的值中获取键。我如何获取具有重复值的两个键，并像这样打印出来：
System.out.print( getKeyFromValue(hashmap, value1), getKeyFromValue(hashmap, value2) )
key1 = 1，key2 = 2
value1 = value2 = 1
private static Object getKeyFromValue(Map hm, Object value) {
for (Object o : hm.keySet()) {
if (hm.get(o).equals(value)) {
return o;
}
}
return null;
}
英文:
I have method getKeyFromValue for LinkedHashMap and I want to get key from the value of this map. How can I get two keys with duplicate values and print it like
System.out.print( getKeyFromValue(hashmap, value1), getKeyFromValue(hashmap, value2) )
key1 = 1, key2 = 2
value1 = value2 = 1
private static Object getKeyFromValue(Map hm, Object value) {
for (Object o : hm.keySet()) {
if (hm.get(o).equals(value)) {
return o;
}
}
return null;
}
答案1
得分: 0
你需要一个名为getKeysFromValue()的方法，并使其返回一个包含键的array或List。
key1 = 1，key2 = 2
value1 = value2 = 1
/* 将键值对放入映射中 */
private static List<Object> getKeysFromValue(Map hm, Object value) {
List<Object> rtn = new ArrayList<>();
for (Object o : hm.keySet()) {
if (hm.get(o).equals(value)) {
rtn.add(o);
}
}
return rtn;
}
英文:
You would need a method getKeysFromValue() and have it return an array or a List of the keys.
key1 = 1, key2 = 2
value1 = value2 = 1
/* put the key - values into the map */
private static List<Object> getKeysFromValue(Map hm, Object value) {
List<Object> rtn = new ArrayList<>();
for (Object o : hm.keySet()) {
if (hm.get(o).equals(value)) {
rtn.add(o);
}
}
return rtn;
}
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