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import java.util.*;
public class AboutSet {
public AboutSet(){
List<String> list=new ArrayList<String>();
list.add("2");
list.add("3");
list.add("4");
Set<String> set=new HashSet<String>();
set.add("2");
set.add("3");
set.add("4");
set.addAll(list);
set.removeAll(list);
Iterator<String> iterator=set.iterator();
while(iterator.hasNext())
System.out.println(iterator.next());
}
public static void main(String[] args) {
new AboutSet();
}
}
public class AboutSet {
public AboutSet() {
List<String> list = new ArrayList<String>();
list.add("2");
list.add("3");
list.add("4");
Set<String> set = new HashSet<String>();
set.add("2");
set.add("3");
set.add("4");
System.out.println(set.addAll(list));
System.out.println(set.add("5"));
System.out.println(set.add("4"));
set.removeAll(list);
Iterator<String> iterator = set.iterator();
while (iterator.hasNext())
System.out.println(iterator.next());
}
public static void main(String[] args) {
new AboutSet();
}
}