# 打印給定整數數組的所有不同元素 > 原文： [https://www.geeksforgeeks.org/print-distinct-elements-given-integer-array/](https://www.geeksforgeeks.org/print-distinct-elements-given-integer-array/) 方法： 1.將所有輸入整數放入哈希圖的鍵 2.在循環外部打印 keySet ## Java ```java import java.util.HashMap; public class UniqueInArray2 { ????public static void main(String args[]) ????{ ????????int ar[] = { 10, 5, 3, 4, 3, 5, 6 }; ????????HashMap<Integer,Integer> hm = new HashMap<Integer,Integer>(); ????????for (int i = 0; i < ar.length; i++) { ????????????hm.put(ar[i], i); ????????} ????????// Using hm.keySet() to print output reduces time complexity. - Lokesh ????????System.out.println(hm.keySet()); ????} } ```