java find duplicates in array

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}

1System.out.print("Duplicate Characters in above string are: ");
2for (int i = 0; i < str.length(); i++) {
3   for (int j = i + 1; j < str.length(); j++) {
4      if (carray[i] == carray[j]) {
5         System.out.print(carray[j] + " ");
6         break;
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}

1 for (String name : names) {
2     if (set.add(name) == false) {
3        // your duplicate element
4     }
5}