HashMap unnecessarily duplicates values
I have the following code, I want to insert the results into the database, but for now I just want to print the keys with their values.
The HashMap is installed with keys before this code, which works great.
The following code goes through the tableView, gets the items from the column, if the item is equal to the key in the hashmap, then it puts the dogsID in the hashmap value.
// loop through tableView items
for (Dog item : BookDogTableView.getItems()) {
// cell data is not null
if ((BookDogSelectRunCol.getCellData(item) != null)) {
// loop through map
for (Integer key : hashMap.keySet()) {
// if chosen run ID equals key
if (BookDogSelectRunCol.getCellData(item)) {
// put dog in map
BookingInformation.hashMap.put(key,
item.getDogID());
}
}
}
for (Integer keyprint : hashMap.keySet()) {
if (hashMap.get(keyprint) != 0) {
System.out.println("RUn ID : " + keyprint + " DogID : "
+ hashMap.get(keyprint));
}
}
}
However, this prints to the screen with duplicate keys.
Is there a way to remove duplicate key values from the map, or change the current code to avoid duplicate key-value pairs.
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Can't duplicate keys in HashMap
.
It turns out you are printing inside a loop for
. Simplified code showing the problem:
for (Dog item : BookDogTableView.getItems()) {
// cell data is not null
...
for (Integer keyprint : hashMap.keySet()) {
if (hashMap.get(keyprint) != 0) {
System.out.println("RUn ID : " + keyprint + " DogID : "
+ hashMap.get(keyprint));
}
}
} //close of outer for loop
The solution is only to move the print path for
out of the outer loop for
.
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