Java 中的 Collections synchronizedList()方法，示例
原文:https://www . geesforgeks . org/collections-synchronized list-method-in-Java-with-examples/
java.util.Collections 类的 synchronizedList() 方法用于返回由指定列表支持的同步(线程安全)列表。为了保证串行访问，通过返回的列表完成对后备列表的所有访问是至关重要的。
语法:
public static <T> List<T>
synchronizedList(List<T> list)
参数:该方法将列表作为参数“包装”在同步列表中。
返回值:该方法返回指定列表的同步视图。
以下是说明同步列表()方法的示例
例 1:
// Java program to demonstrate
// synchronizedList() 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> list = new ArrayList<String>();
// populate the list
list.add("A");
list.add("B");
list.add("C");
list.add("D");
list.add("E");
// printing the Collection
System.out.println("List : " + list);
// create a synchronized list
List<String> synlist = Collections
.synchronizedList(list);
// printing the Collection
System.out.println("Synchronized list is : " + synlist);
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
List : [A, B, C, D, E]
Synchronized list is : [A, B, C, D, E]
例 2:
// Java program to demonstrate
// synchronizedList() method for Integer Value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// creating object of List<Integer>
List<Integer> list = new ArrayList<Integer>();
// populate the list
list.add(20);
list.add(30);
list.add(40);
list.add(50);
list.add(60);
// printing the Collection
System.out.println("List : " + list);
// create a synchronized list
List<Integer> synlist = Collections
.synchronizedList(list);
// printing the Collection
System.out.println("Synchronized list is : " + synlist);
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
List : [20, 30, 40, 50, 60]
Synchronized list is : [20, 30, 40, 50, 60]
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