How to add all values from UnmodifiableSet to ArrayList?

Question

I have a twinColSelect and i m populating this from database. I need to access its selected items. I tried below the code but it didn't worked. How can i do that ?

ArrayList<String> systemNames = new ArrayList<String>();
systemNames = (ArrayList<String>) twinColSelectSystem.getValue();

for (int i=0;i<systemNames.size();i++)
System.out.println(systemNames.get(i));

TwinColSelect returns java.util.Set – Krayo Dec 05 '14 at 13:01 — Krayo, Dec 05 '14 at 13:01
is there a way to add components to ArrayList ? – developerCoder Dec 05 '14 at 13:04 — developerCoder, Dec 05 '14 at 13:04

score 1 · Answer 1 · answered Dec 05 '14 at 13:07

1

Try this:

ArrayList<String> systemNames =
    new ArrayList<String>((Set<String>) twinColSelectSystem.getValue());

answered Dec 05 '14 at 13:07

Krayo

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Throwable occurred: java.lang.ClassCastException: java.util.Collections$UnmodifiableSet incompatible with java.util.ArrayList – developerCoder Dec 05 '14 at 13:10

score 1 · Accepted Answer · answered Dec 05 '14 at 13:13

1

Try this:

    ArrayList<String> systemNames = new ArrayList<String>();
    systemNames.addAll((Set<String>) twinColSelectSystem.getValue());

answered Dec 05 '14 at 13:13

Ruslan Ostafiichuk

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How to add all values from UnmodifiableSet to ArrayList?

2 Answers2