can someone tell that why this program is always returning null array of string here.
WHY THE HELL IT ISN'T SATISFYING THE IF CONDITION?

The question is-

Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings.

You need to help them find out their common interest with the least list index sum. If there is a choice tie between answers, output all of them with no order requirement. You could assume there always exists an answer.

Example 1:

Input: list1 = ["Shogun","Tapioca Express","Burger King","KFC"], list2 = ["Piatti","The Grill at Torrey Pines","Hungry Hunter Steakhouse","Shogun"]
Output: ["Shogun"]
Explanation: The only restaurant they both like is "Shogun".
Example 2:

Input: list1 = ["Shogun","Tapioca Express","Burger King","KFC"], list2 = ["KFC","Shogun","Burger King"]
Output: ["Shogun"]
Explanation: The restaurant they both like and have the least index sum is "Shogun" with index sum 1 (0+1).

class Solution {
    public String[] findRestaurant(String[] list1, String[] list2) {
        int n=list1.length;
        int m=list2.length;
        int curr=Integer.MAX_VALUE;
        String[] list3 = new String[1];
        for(int i=0;i<n;i++){
            for(int j=0;j<m;j++){
                if(list1[i]==list2[j]) {
                    if(i+j<curr){
                    curr=i+j;
                    list3[0]=list1[i];
                    }
                }
            }
        }
        return list3;
    }
}