Collections,Synchronized

 

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

//public static Collection synchronizedCollention(Collection c)
//
//public static List synchronizedList(list l)
//
//public static Map synchronizedMap(Map m)
//
//public static Set synchronizedSet(Set s)
//
//public static SortedMap synchronizedSortedMap(SortedMap sm)
//
//public static SortedSet synchronizedSortedSet(SortedSet ss)

public class CollectionsSynchronizedTest {

	public static void main(String[] args) {
		// To be on the safe side, use only one reference to the sync list, this ensures that all access is controlled
        //The collection must be synchronized, here is a List
        List wordList = Collections.synchronizedList(new ArrayList());

        //The add method in wordList is a synchronous method, which will acquire the object lock of the wordList instance
        wordList.add("Iterators");
        wordList.add("require");
        wordList.add("special");
        wordList.add("handling");

        //Get the object lock of the wordList instance,
        //When iterating, block other threads to call methods such as add or remove to modify elements
        synchronized ( wordList ) {
            Iterator iter = wordList.iterator();
            while ( iter.hasNext() ) {
                String s = (String) iter.next();
                System.out.println("found string: " + s + ", length=" + s.length());
            }
        }
    }
}

 

 

 

 

 

 

 

 

 

 

 

 

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