java array check duplicates

1duplicates = false;
2
3for(i = 0; i < zipcodeList.length; i++) {
4	for(j = i + 1; k < zipcodeList.length; j++) {
5  		if(j != i && zipcodeList[j] == zipcodeList[i]) {
6   	  		duplicates = true;
7		}
8	}
9}

1// Uses a set, which does not allow duplicates 
2
3for (String name : names) 
4{
5     if (set.add(name) == false) 
6     {
7        // print name your duplicate element
8     }
9}