package my.util;

import java.util.LinkedList;
import java.util.ListIterator;

/**
 * 唯一字符串List
 */
public class UniqueStringList extends LinkedList<String> {

    private boolean ignoreCase;

    public UniqueStringList(boolean ignoreCase) {
        this.ignoreCase = ignoreCase;
    }

    @Override
    public boolean add(String e) {    
        ListIterator<String> iterator = listIterator();
        while (iterator.hasNext()) {
            String next = iterator.next();          
            if(ignoreCase?e.equalsIgnoreCase(next):e.equals(next))
                return false;
        }
        return super.add(e);
    }

    public static void main(String[] args) {
        UniqueStringList usl = new UniqueStringList(true);
        usl.add("CodeSnippet.cn");
        usl.add("codeSnippet.Cn");
        usl.add("CODEsnippet.Cn");
        for(String s : usl)
            System.out.println(s);
    }
}

//源代码片段来自云代码http://yuncode.net