如果队列未满,LinkedBlockingQueue的put(E e)方法将作为参数传递的元素插入此LinkedBlockingQueue尾部的方法。如果队列已满,则此方法将等待空间变为可用,并且在空间可用之后,它将元素插入LinkedBlockingQueue。
用法:
public void put(E e) throws InterruptedException
参数:此方法采用强制性参数e,该参数是要插入LinkedBlockingQueue中的元素。
返回值:该方法不返回任何内容。
异常:此方法引发以下异常:
- InterruptedException–在等待队列可用时发生中断
- NullPointerException –如果传递给方法的元素为null
下面的程序演示了LinkedBlockingQueue类的put(E e)方法:
示例1:使用put()方法将新名称添加到队列后,打印LinkedBlockingQueue的元素。
// Java Program Demonstrate put(E e)
// method of LinkedBlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// define capacity of LinkedBlockingQueue
int capacityOfQueue = 4;
// create object of LinkedBlockingQueue
LinkedBlockingQueue<String> linkedQueue
= new LinkedBlockingQueue<String>(capacityOfQueue);
// Add element usin put() method
linkedQueue.put("Karan");
linkedQueue.put("Suraj");
linkedQueue.put("Harsh");
linkedQueue.put("Rahul");
// print elements of queue
System.out.println("Items in Queue are " + linkedQueue);
}
}
输出:
Items in Queue are [Karan, Suraj, Harsh, Rahul]
示例2:在LinkedBlockingQueue中使用put方法添加Employee对象
// Java Program Demonstrate put()
// method of LinkedBlockingQueue
import java.util.Iterator;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public void PutDemo() throws InterruptedException
{
// define capacity of LinkedBlockingQueue
int capacityOfQueue = 5;
// create object of LinkedBlockingQueue
LinkedBlockingQueue<Employee> linkedQueue
= new LinkedBlockingQueue<Employee>(capacityOfQueue);
// Add element to 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);
// Add Employee Objects to linkedQueue
// Using put(E e)
linkedQueue.put(emp1);
linkedQueue.put(emp2);
linkedQueue.put(emp3);
System.out.println("Details of Employees:");
// print details of linkedQueue
Iterator itr = linkedQueue.iterator();
while (itr.hasNext())
System.out.println(itr.next());
}
// create an Employee Object with name,
// position, salary and age as attributes
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 + "]";
}
}
// Main Method
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:
Details of Employees: 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]
示例3:显示put()方法抛出的NullPointerException
// Java Program Demonstrate put(E e)
// method of LinkedBlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// define capacity of LinkedBlockingQueue
int capacityOfQueue = 4;
// create object of LinkedBlockingQueue
LinkedBlockingQueue<String> linkedQueue
= new LinkedBlockingQueue<String>(capacityOfQueue);
// try to put null value in put method
try {
linkedQueue.put(null);
}
catch (Exception e) {
// print error details
System.out.println("Exception: " + e);
}
}
}
输出:
Exception: java.lang.NullPointerException
参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#put-E-
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