Java 中的 Collections synchronized collection()方法，示例

原文:https://www . geeksforgeeks . org/collections-synchronized collection-method-in-Java-with-examples/

java.util.Collections 类的 synchronizedCollection() 方法用于返回由指定集合支持的同步(线程安全)集合。为了保证串行访问，通过返回的集合完成对后备集合的所有访问是非常重要的。 语法:

public static <T> Collection<T>
  synchronizedCollection(Collection<T> c)

参数:该方法将集合 c 作为参数“包装”在同步集合中。 返回值:该方法返回指定集合的同步视图。 以下是举例说明synchronized collection()方法 示例 1:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate synchronizedCollection()
// method for String Value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            // creating object of List<String>
            List<String> vector = new ArrayList<String>();

            // populate the vector
            vector.add("A");
            vector.add("B");
            vector.add("C");
            vector.add("D");
            vector.add("E");

            // printing the Collection
            System.out.println("Collection : " + vector);

            // getting the synchronized view of Collection
            Collection<String> c = Collections
                                       .synchronizedCollection(vector);

            // printing the Collection
            System.out.println("Synchronized view"
                               + " of collection : " + c);
        }

        catch (IndexOutOfBoundsException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output

Collection : [A, B, C, D, E]
Synchronized view of collection : [A, B, C, D, E]

例 2:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to demonstrate synchronizedCollection()
// method for Integer Value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            // creating object of List<String>
            List<Integer> vector = new ArrayList<Integer>();

            // populate the vector
            vector.add(20);
            vector.add(30);
            vector.add(40);
            vector.add(50);
            vector.add(60);

            // printing the Collection
            System.out.println("Collection : " + vector);

            // getting the synchronized view of Collection
            Collection<Integer> c = Collections
                                        .synchronizedCollection(vector);

            // printing the Collection
            System.out.println("Synchronized view is : " + c);
        }

        catch (IllegalArgumentException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

Collection : [20, 30, 40, 50, 60]
Synchronized view is : [20, 30, 40, 50, 60]

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