Java TreeMap获取同步Map

TreeMap可以使用Collections.synchronizedMap()方法进行同步。Collections类的synchronizedMap()方法将需要同步化的Map作为参数，并返回一个线程安全的同步Map。java.util.Collections类的synchronizedMap()方法用于返回一个由指定Map支持的同步（线程安全）Map。为了保证串行访问，对支持地图的所有访问都是通过返回的地图完成的，这一点至关重要。

语法:

public static <K, V> Map<K, V> synchronizedMap(Map<K, V> m)

参数： 作为一个参数被 “包裹 “在一个同步地图中。

返回值： 的指定地图。

实施。

示例

// Java program to demonstrate
// synchronization of TreeMap
 
// Importing all classes from
// java.util package
import java.util.*;
 
// Class
public class GFG {
 
    // Main driver method
    public static void main(String[] args) throws Exception
    {
 
        // Try block to check if any exception occurs
        try {
 
            // Step1: Creating a TreeMap object
            // Declaring object of string type
            TreeMap<String, String> treeMap
                = new TreeMap<String, String>();
 
            // Step2: Adding elements into the above Map
            // Custom inputs
            treeMap.put("1", "Welcome");
            treeMap.put("2", "To");
            treeMap.put("3", "Geeks");
            treeMap.put("4", "For");
            treeMap.put("5", "Geeks");
 
            // Printing all elements of the above Map object
            System.out.println("Map : " + treeMap);
 
            // Synchronizing the map using
            // synchronizedMap() method of Collection class
            Map<String, String> sMap
                = Collections.synchronizedMap(treeMap);
 
            // Printing the Collection
            System.out.println("Synchronized map is : "
                               + sMap);
        }
 
        // Catch block to handle the exceptions
        catch (IllegalArgumentException e) {
 
            // Displaying and printing the exception
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出

Map : {1=Welcome, 2=To, 3=Geeks, 4=For, 5=Geeks}
Synchronized map is : {1=Welcome, 2=To, 3=Geeks, 4=For, 5=Geeks}