Java Collections synchronizedList()用法及代碼示例

java.util.Collections類的synchronizedList()方法用於返回由指定列表支持的同步(線程安全)列表。為了保證串行訪問，至關重要的是，對後備列表的所有訪問都必須通過返回的列表來完成。

用法:

public static <T> List<T>
  synchronizedList(List<T> list)

參數：此方法將列表作為參數，作為同步列表中的“wrapped”。

返回值：此方法返回指定列表的同步視圖。

以下示例說明了synchronizedList()方法

示例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); 
        } 
    } 
}

輸出：

List : [A, B, C, D, E]
Synchronized list is : [A, B, C, D, E]

示例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); 
        } 
    } 
}

輸出：

List : [20, 30, 40, 50, 60]
Synchronized list is : [20, 30, 40, 50, 60]

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Collections synchronizedList() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。