Java LinkedBlockingQueue iterator()用法及代碼示例

LinkedBlockingQueue的iterator()方法以正確的順序返回與此LinkedBlockingQueue相同的元素的迭代器。從此方法返回的元素按從LinkedBlockingQueue的first(head)到last(tail)的順序包含所有元素。返回的迭代器是弱一致性的。

用法:

public Iterator<E> iterator()

返回值：該方法按從first(head)到last(tail)的順序返回具有與LinkedBlockingQueue中存在的元素相同的迭代器。

以下示例程序旨在說明LinkedBlockingQueue類的iterator()方法：

示例1:從LinkedBlockingQueue創建一個Iteretor，其中包含班級不同學生的名字。

// 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()); 
    } 
}

輸出：

list of names:
John
Tom
Clark
Kat

示例2:從包含員工列表的LinkedBlockingQueue創建Iteretor。

// 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(); 
    } 
}

輸出：

list of Employees:
*************************
Employee Name : Sachin
Employee Position : Developer
Employee Salary : 39000
*************************
Employee Name : Sanjeev
Employee Position : Tester
Employee Salary : 26000

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

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