Java中的LinkedBlockingQueue迭代器（）方法-yiteyi-C++库

这个 迭代器（） LinkedBlockingQueue的方法以正确的顺序返回与此LinkedBlockingQueue相同元素的迭代器。此方法返回的元素包含按顺序排列的所有元素 第一名（负责人） 到 最后（尾巴） LinkedBlockingQueue的。返回的迭代器弱一致。 语法：

null

public Iterator<E> iterator()

返回值： 该方法返回迭代器，该迭代器的元素与LinkedBlockingQueue中的元素相同，顺序从第一个（头）到最后一个（尾）。下面的程序演示了LinkedBlockingQueue类的迭代器（）方法： 项目1： 从LinkedBlockingQueue创建迭代器，其中包含一个类中不同学生的名称。

JAVA

                         // Java Program Demonstrate iterator()                       
                         // method of LinkedBlockingQueue                       
           
                         import                                     java.util.concurrent.LinkedBlockingQueue;                       
                         import                                     java.util.Iterator;                       
           
                         public                                     class                                     GFG {                       
           
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 // define capacity of LinkedBlockingQueue                       
                                                 int                                     capacityOfQueue =                                     7                                     ;                       
           
                                                 // create object of LinkedBlockingQueue                       
                                                 LinkedBlockingQueue<String> linkedQueue                       
                                                 =                                     new                                     LinkedBlockingQueue<String>(capacityOfQueue);                       
           
                                                 // Add element to LinkedBlockingQueue                       
                                                 linkedQueue.add(                                     "John"                                     );                       
                                                 linkedQueue.add(                                     "Tom"                                     );                       
                                                 linkedQueue.add(                                     "Clark"                                     );                       
                                                 linkedQueue.add(                                     "Kat"                                     );                       
           
                                                 // create Iterator of linkedQueue using iterator() method                       
                                                 Iterator<String> listOfNames = linkedQueue.iterator();                       
           
                                                 // print result                       
                                                 System.out.println(                                     "list of names:"                                     );                       
                                                 while                                     (listOfNames.hasNext())                       
                                                 System.out.println(listOfNames.next());                       
                                                 }                       
                         }                       

输出：

list of names:JohnTomClarkKat

项目2： 从包含员工列表的LinkedBlockingQueue创建迭代器。

JAVA

                         // Java Program Demonstrate iterator()                       
                         // method of LinkedBlockingQueue                       
           
                         import                                     java.util.concurrent.LinkedBlockingQueue;                       
                         import                                     java.util.Iterator;                       
           
                         public                                     class                                     GFG {                       
           
                                                 public                                     void                                     collectIterator()                       
                                                 {                       
                                                 // define capacity of LinkedBlockingQueue                       
                                                 int                                     capacityOfQueue =                                     7                                     ;                       
           
                                                 // create object of LinkedBlockingQueue                       
                                                 LinkedBlockingQueue<Employee> linkedQueue                       
                                                 =                                     new                                     LinkedBlockingQueue<Employee>(capacityOfQueue);                       
           
                                                 // Add element to LinkedBlockingQueue                       
                                                 Employee emp1 =                                     new                                     Employee(                                     "Sachin"                                     ,                                     "Developer"                                     ,                                     "39000"                                     );                       
                                                 Employee emp2 =                                     new                                     Employee(                                     "Sanjeev"                                     ,                                     "Tester"                                     ,                                     "26000"                                     );                       
           
                                                 // Add Employee Objects to linkedQueue                       
                                                 linkedQueue.add(emp1);                       
                                                 linkedQueue.add(emp2);                       
           
                                                 // create Iterator of linkedQueue using iterator() method                       
                                                 Iterator<Employee> listOfEmployee = linkedQueue.iterator();                       
           
                                                 // print result from iterator                       
                                                 System.out.println(                                     "list of Employees:"                                     );                       
                                                 while                                     (listOfEmployee.hasNext()) {                       
                                                 System.out.println(                                     "*************************"                                     );                       
                                                 Employee emp = listOfEmployee.next();                       
                                                 System.out.println(                                     "Employee Name : "                                     + emp.name);                       
                                                 System.out.println(                                     "Employee Position : "                                     + emp.position);                       
                                                 System.out.println(                                     "Employee Salary : "                                     + emp.salary);                       
                                                 }                       
                                                 }                       
           
                                                 // create an Employee Object with name,                       
                                                 // position and salary as an attribute                       
                                                 public                                     class                                     Employee {                       
           
                                                 public                                     String name;                       
                                                 public                                     String position;                       
                                                 public                                     String salary;                       
           
                                                 Employee(String name, String position, String salary)                       
                                                 {                       
                                                 this                                     .name = name;                       
                                                 this                                     .position = position;                       
                                                 this                                     .salary = salary;                       
                                                 }                       
           
                                                 @Override                       
                                                 public                                     String toString()                       
                                                 {                       
                                                 return                                     "Employee [name="                                     + name +                                     ", position="                       
                                                 + position +                                     ", salary="                                     + salary +                                     "]"                                     ;                       
                                                 }                       
                                                 }                       
           
                                                 // Main Method                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 GFG gfg =                                     new                                     GFG();                       
                                                 gfg.collectIterator();                       
                                                 }                       
                         }                       

输出：

list of Employees:*************************Employee Name : SachinEmployee Position : DeveloperEmployee Salary : 39000*************************Employee Name : SanjeevEmployee Position : TesterEmployee Salary : 26000

参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#iterator–

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