Weak_Hash_Map.size()

// Java演示size()方法的代码
import java.util.*;
  
public class Weak_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // 创建一个空的WeakHashMap
        Map weak_hash = new
                       WeakHashMap();
  
        // 将字符串值映射到整数键
        weak_hash.put(10, "Geeks");
        weak_hash.put(15, "4");
        weak_hash.put(20, "Geeks");
        weak_hash.put(25, "Welcomes");
        weak_hash.put(30, "You");
  
        // 显示WeakHashMap
        System.out.println("初始映射为：" +
                                          weak_hash);
  
        // 显示地图的大小
        System.out.println("地图的大小是 " +
                                     weak_hash.size());
    }
}

初始映射为：{30=You, 15=4, 10=Geeks, 25=Welcomes, 20=Geeks}
地图的大小是5

// Java演示size()方法的代码
import java.util.*;
  
public class Weak_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // 创建一个空的WeakHashMap
        Map weak_hash = new
                       WeakHashMap();
  
       //将整数值映射到字符串键
        weak_hash.put("Geeks", 10);
        weak_hash.put("4", 15);
        weak_hash.put("Geeks", 20);
        weak_hash.put("Welcomes", 25);
        weak_hash.put("You", 30);
  
        // 显示WeakHashMap
        System.out.println("初始映射为：" +
                                          weak_hash);
  
        // 显示地图的大小
        System.out.println("地图的大小是 " +
                                     weak_hash.size());
    }
}

初始映射为：{Welcomes=25, 4=15, You=30, Geeks=20}
地图的大小是4