Question

I want to go through every items in a dictionary in java. to clarify what I want to do, this is the C# code

Dictionary<string, Label> LableList = new Dictionary<string, Label>();
foreach (KeyValuePair<string, Label> z in LabelList);

I don’t know how to do this is java, for example I did this

for(Object z: dic)

but it says it’s not iterable. Please advise……

Answer 1

I’m assuming you have a Map<String, Label> which is the Java built-in dictionary structure. Java doesn’t let you iterate directly over a Map (i.e. it doesn’t implement Iterable) because it would be ambiguous what you’re actually iterating over.

It’s just a matter of choosing to iterate through the keys, values or entries (both).

e.g.

Map<String, Label> map = new HashMap<String, Label>();
//...

for ( String key : map.keySet() ) {
}

for ( Label value : map.values() ) {
}

for ( Map.Entry<String, Label> entry : map.entrySet() ) {
    String key = entry.getKey();
    Label value = entry.getValue();
}

Your C# code seems to be the same as iterating over the entries (the last example).