Compare Java arrays -


i'm trying compare names of roomtypes in simple java program can't work.

so far have this:

public class main { public static void main(string[] args) {     roomtype[] ar = new roomtype[10];     string s = "";     string duplicate = "";      ar[0] = new roomtype("standaard", 2, 60.0);     ar[1] = new roomtype("deluxe", 2, 85.0);     ar[2] = new roomtype("deluxe", 4, 125.0);     ar[3] = new roomtype("hiker", 2, 35.0);      (int = 0; < ar.length; i++) {         if (ar[i] != null) {             s += ar[i] + "\n";         }          (int j = 0; j < ar.length -1; j++) {             if (ar[i] == ar[j] && ar[i] != null && ar[j] != null) {                 duplicate = ar[i] + " has same name " + ar[j];             }         }     }      system.out.println("these roomtypes: \n" + s + "\n");     system.out.println(duplicate); }

}

i want compare names (the first elements in arrays) of ar[]'s , if there doubles need sysout gives position (ar[]) of doubles. method gettypename() in different class roomtype.

here interpreted asking for:

for(int = 0; < ar.length; i++) {   if(ar[i] != null)     s += ar[i].gettypename()+"\n";  for(int j = 1; j < ar.length; j++)   {     if(ar[i] != null && ar[j] != null && ar[i].gettypename().equals(ar[j].gettypename()))     {         duplicate += i+" has same name "+j+"\n";     }   } } system.out.println("these roomtypes: \n"+s+"\n"); system.out.println(duplicate);

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