Java 中 ArrayBlockingQueue remaingccapacity()方法
原文:https://www . geeksforgeeks . org/arrayblockingqueue-remainingcapacity-method-in-Java/
ArrayBlockingQueue是有界的，阻塞队列存储由数组支持的内部元素。
- ArrayBlockingQueue类是 Java Collections 框架的成员。
- 有界意味着它会有一个固定的大小，你不能存储数量超过队列容量的元素。
- 队列还遵循先进先出规则来存储和移除队列中的元素。
- 如果你试图把一个元素放到一个满的队列中，或者从一个空的队列中取出一个元素，那么这个队列就会阻塞你。
remainingCapacity() 方法返回可以添加到队列中而不会阻塞的更多元素的数量。这始终等于该队列的初始容量与该队列的当前大小之差。
语法:
public int remainingCapacity()
参数:该方法不取任何参数。
返回值:该方法返回队列的剩余容量。
下面的程序说明了 ArrayBlockingQueue 的 remainingCapacity()方法: 程序 1:
// Program to demonstrate remainingCapacity() method
// of ArrayBlockingQueue
import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// Define capacity of ArrayBlockingQueue
int capacity = 5;
// Create object of ArrayBlockingQueue
ArrayBlockingQueue<Integer> queue = new
ArrayBlockingQueue<Integer>(capacity);
// Add elements to ArrayBlockingQueue
queue.add(23);
queue.add(32);
// Print queue after adding numbers
System.out.println("Queue :" + queue);
// Check remaining capacity
int remainingCapacity = queue.remainingCapacity();
System.out.println("Remaining Capacity:" +
remainingCapacity);
// Add elements to ArrayBlockingQueue
queue.add(54);
queue.add(78);
// Print queue after adding numbers
System.out.println("Queue :" + queue);
// Check remaining capacity
System.out.println("Remaining Capacity:" +
queue.remainingCapacity());
}
}
Output:
Queue :[23, 32]
Remaining Capacity:3
Queue :[23, 32, 54, 78]
Remaining Capacity:1
程序 2:
// Program to demonstrate remainingCapacity() method
// of ArrayBlockingQueue
import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
// Create a User Object with name and age as an attribute
public class User {
public String name;
public String age;
User(String name, String age)
{
this.name = name;
this.age = age;
}
}
// Main Method
public static void main(String[] args)
{
GFG gfg = new GFG();
gfg.RemainingCapacityExample();
}
// Method to give example of contains function
public void RemainingCapacityExample()
{
// Define capacity of ArrayBlockingQueue
int capacity = 5;
// Create object of ArrayBlockingQueue
ArrayBlockingQueue<User> queue = new
ArrayBlockingQueue<User>(capacity);
// Create user objects
User user1 = new User("Aman", "24");
User user2 = new User("Amar", "23");
User user3 = new User("Sanjeet", "25");
// Add Objects to ArrayBlockingQueue
queue.offer(user1);
queue.offer(user2);
queue.offer(user3);
// Check remaining capacity
int remainingCapacity = queue.remainingCapacity();
System.out.println("Remaining Capacity:" +
remainingCapacity);
User user4 = new User("Suvo", "26");
User user5 = new User("Ravi", "22");
// Adding more objects
queue.offer(user2);
queue.offer(user3);
// Check remaining capacity
remainingCapacity = queue.remainingCapacity();
System.out.println("Remaining Capacity:" +
remainingCapacity);
}
}
Output:
Remaining Capacity:2
Remaining Capacity:0
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