Java Collections syncList()
Java集合类的
synchronizedList()方法用于获取支持的同步(线程安全)集合
语法
以下是
synchronizedList()方法的声明:
public static <T> List<T> synchronizedList(List<T> list)
参数
| 参数 |
说明 |
必需/可选 |
| list |
它是将被包装在同步列表中的列表。 |
必需 |
返回
synchronizedList()方法返回指定列表的同步视图。
异常
NA
兼容版本
Java 1.5及更高版本
示例1
import java.util.*;
public class CollectionsSynchronizedListExample1 {
public static void main(String[] args) {
//Create ArrayList object
List<String> list = new ArrayList<String>();
//Add values in the list
list.add("A");
list.add("B");
list.add("C");
list.add("D");
list.add("E");
//Create a synchronized list
List<String> synlist = Collections.synchronizedList(list);
System.out.println("Synchronized list is :"+synlist);
}
}
输出:
Synchronized list is :[A, B, C, D, E]
示例2
import java.util.*;
public class CollectionsSynchronizedListExample2 {
public static void main(String[] args) {
//Create a list with items
List<Integer> list = Arrays.asList(44, 55, 99, 77, 88, 66);
//Create a synchronized List
List<Integer> coll = Collections.synchronizedList(list);
System.out.println("Synchronized list is :"+coll);
}
}
输出:
Synchronized view is :[44, 55, 99, 77, 88, 66]
示例3
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class CollectionsSynchronizedListExample3 {
public static void main(String[] args) throws InterruptedException {
List<Integer> integers = new ArrayList<>();
List<Integer> list = Collections.synchronizedList(integers);
Collections.addAll(list, new Integer[10000]);
System.out.println("Initial size: " + list.size());
final ExecutorService e = Executors.newFixedThreadPool(10);
for (int i = 0; i < list.size(); i++) {
e.execute(() -> list.remove(0));
}
e.shutdown();
e.awaitTermination(1000, TimeUnit.SECONDS);
System.out.println(list.size());//should be zero
}
}
输出:
