同步集合类的应用

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使用Concurrentmap代替Hashmap
Collections.synchronizedMap(null);

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package cn.itcast.heima2;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.concurrent.CopyOnWriteArrayList;
public class CollectionModifyExceptionTest {
	public static void main(String[] args) {
		Collection users = new CopyOnWriteArrayList();//如果使用ArrayList,在遍历过程中不能使用remove
			
			//new ArrayList();
		users.add(new User("张三",28));
		users.add(new User("李四",25));
		users.add(new User("王五",31));
		Iterator itrUsers = users.iterator();
		while(itrUsers.hasNext()){
			System.out.println("aaaa");
			User user = (User)itrUsers.next();
			if("张三".equals(user.getName())){
				users.remove(user);
				//itrUsers.remove();
			} else {
				System.out.println(user);				
			}
		}
	}
}