Java – delete duplicates from ArrayList?

How do I remove duplicates from ArrayList?

I have getccnptags array as [Java, PHP, C, Java, PHP]. I get the hyperlink I give to each array variable from the bean array, but I want to delete duplicates and then add hyperlinks. Can I add any code in my following code to delete duplicates

for(int k=0;k<name.getCcnptags().size();k++)
    {

    String tag=name.getCcnptags().get(k);
        if(k!=name.getCcnptags().size()-1)
    {
    tag=tag+",";

    }
    %>
    <a href='#'><%=tag%></a>
}

Solution

It is best to use HashSet If this is not possible, you can use a temporary HashSet

ArrayList a= new ArrayList();
HashSet hs = new HashSet();
hs.addAll(a);  // willl not add the duplicate values
a.clear();
a.addAll(hs);  // copy the unique values again to arraylist