Java中的BlockingQueue put()方法及其示例

Java中的BlockingQueue put()方法及其示例

Java中的 BlockingQueue 接口的 put(E e) 方法将作为参数传递的元素插入到此BlockingQueue的尾部,如果队列未满。如果队列已满,则此方法将等待空间变得可用,并在空间可用后将元素插入到BlockingQueue中。

语法:

public void put(E e) throws InterruptedException

参数: 此方法接受一个必填参数 e ,它是要插入到LinkedBlockingQueue中的元素。

返回值: 此方法不返回任何内容。

异常: 此方法抛出以下异常:

  • InterruptedException – 等待队列可用时发生中断时
  • NullPointerException – 如果传递给该方法的元素为null

注意: Java中的 BlockingQueueput() 方法已从Java中的 Queue 类继承。

下面的程序演示了BlockingQueue类的put(E e)方法:

程序1:

// Java程序演示BlockingQueue的put(E e)方法
 
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
public class GFG {
 
    public static void main(String[] args)
        throws InterruptedException
    {
        // 定义BlockingQueue的容量
        int capacityOfQueue = 4;
 
        // 创建BlockingQueue对象
        BlockingQueue<String> BQ
            = new LinkedBlockingQueue<String>(capacityOfQueue);
 
        // 使用put()方法添加元素
        BQ.put("Karan");
        BQ.put("Suraj");
        BQ.put("Harsh");
        BQ.put("Rahul");
 
        // 打印队列中的元素
        System.out.println("Items in Queue are " + BQ);
    }
}

输出:

Items in Queue are [Karan, Suraj, Harsh, Rahul]

程序2:

// Java程序演示了BlockingQueue的put()方法
 
import java.util.Iterator;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
public class GFG {
 
    public void PutDemo() throws InterruptedException
    {
        // 定义BlockingQueue的容量
        int capacityOfQueue = 5;
 
        // 创建BlockingQueue对象
        BlockingQueue<Employee> BQ
            = new LinkedBlockingQueue<Employee>(capacityOfQueue);
 
        // 向BlockingQueue添加元素
        Employee emp1 = new Employee("Ranjeet", "Tester", "29000", 27);
        Employee emp2 = new Employee("Sanjeet", "Manager", "98000", 34);
        Employee emp3 = new Employee("Karan", "Analyst", "44000", 30);
 
        // 使用put(E e)将Employee对象添加到BlockingQueue中
        BQ.put(emp1);
        BQ.put(emp2);
        BQ.put(emp3);
 
        System.out.println("员工的详细信息:");
        // 打印BlockingQueue的详细信息
        Iterator itr = BQ.iterator();
        while (itr.hasNext())
            System.out.println(itr.next());
    }
 
    // 创建Employee对象,包括姓名、职位、年龄和工资等属性
    public class Employee {
 
        public String name;
        public String position;
        public String salary;
        public int Age;
        Employee(String name, String position,
                 String salary, int age)
        {
            this.name = name;
            this.position = position;
            this.salary = salary;
            this.Age = age;
        }
        @Override
        public String toString()
        {
            return "Employee [name=" + name + ", position="
                + position + ", salary=" + salary
                + ", Age=" + Age + "]";
        }
    }
 
    // 主方法
    public static void main(String[] args)
    {
        GFG gfg = new GFG();
        try {
            gfg.PutDemo();
        }
        catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

输出:

员工的详细信息:
Employee [name=Ranjeet, position=Tester, salary=29000, Age=27]
Employee [name=Sanjeet, position=Manager, salary=98000, Age=34]
Employee [name=Karan, position=Analyst, salary=44000, Age=30]

程序3:

// Java程序演示了BlockingQueue的put(E e)方法
 
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
 
public class GFG {
 
    public static void main(String[] args)
        throws InterruptedException
    {
        // 定义BlockingQueue的容量
        int capacityOfQueue = 4;
 
        // 创建BlockingQueue对象
        BlockingQueue<String> BQ
            = new LinkedBlockingQueue<String>(capacityOfQueue);
 
        // 尝试将null值放入put()方法里
        try {
            BQ.put(null);
        }
        catch (Exception e) {
            // 打印错误详情
            System.out.println("异常:" + e);
        }
    }
}

输出:

异常:java.lang.NullPointerException

参考资料: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingQueue.html#put(E)

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