Java LinkedBlockingQueue put()方法示例

Java LinkedBlockingQueue put()方法示例

LinkedBlockingQueueput(E e) 方法会将作为参数传递的元素插入到此LinkedBlockingQueue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,然后将元素插入到LinkedBlockingQueue中。

语法:

public void put(E e) throws InterruptedException

参数: 此方法需要一个必需参数 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: 此方法会抛出以下异常:

  • InterruptedException - 当等待队列可用时发生中断
  • NullPointerException - 如果传递给方法的元素为null

以下程序说明了LinkedBlockingQueue类的put(E e)方法:

程序1: 使用put()方法将新名称添加到队列中后打印LinkedBlockingQueue元素。

//Java程序演示LinkedBlockingQueue的put(E e)方法
import java.util.concurrent.LinkedBlockingQueue;
 
public class GFG {
 
    public static void main(String [] args)
        throws InterruptedException
    {
        //定义LinkedBlockingQueue的容量
        int capacityOfQueue = 4;
 
        //创建LinkedBlockingQueue对象
        LinkedBlockingQueue  linkedQueue
            = new LinkedBlockingQueue (capacityOfQueue);
 
        //使用put()方法添加元素
        linkedQueue.put(“Karan”);
        linkedQueue.put(“Suraj”);
        linkedQueue.put(“Harsh”);
        linkedQueue.put(“Rahul”);
 
        //打印队列的元素
        System.out.println(“排队物品是”+ linkedQueue);
    }
} ```  

输出:

排队物品是 [Karan,Suraj,Harsh,Rahul] 

程序2: 使用put方法在LinkedBlockingQueue中添加Employee对象。

// Java程序演示LinkedBlockingQueue的put()方法
 
import java.util.Iterator;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
 
    public void PutDemo() throws InterruptedException
    {
        // 定义LinkedBlockingQueue的容量
        int capacityOfQueue = 5;
 
        // 创建LinkedBlockingQueue对象
        LinkedBlockingQueue<Employee> linkedQueue
            = new LinkedBlockingQueue<Employee>(capacityOfQueue);
 
        // 添加元素到LinkedBlockingQueue
        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)添加Employee对象到linkedQueue中
        linkedQueue.put(emp1);
        linkedQueue.put(emp2);
        linkedQueue.put(emp3);
 
        System.out.println("员工的详细信息:");
        // 遍历linkedQueue的迭代器并输出
        Iterator itr = linkedQueue.iterator();
        while (itr.hasNext())
            System.out.println(itr.next());
    }
 
    //创建一个名字、职位、薪水和年龄为属性的Employee对象
    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 "员工 [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:
员工 [name=Ranjeet, position=Tester, salary=29000, Age=27]
员工 [name=Sanjeet, position=Manager, salary=98000, Age=34]
员工 [name=Karan, position=Analyst, salary=44000, Age=30]

程序3: 演示put()方法抛出NullPointerException异常

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

输出:

异常: java.lang.NullPointerException

参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#put-E-

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