Java中的PriorityBlockingQueue remainingCapacity（）方法-yiteyi-C++库

这个 剩余容量 方法 优先阻塞队列 用于检查 可以在这个队列中插入多少元素。 但由于PriorityBlockingQueue是无界的，因此该方法总是返回 整数最大值 因为PriorityBlockingQueue没有容量限制。 语法：

null

public int remainingCapacity()

返回值： 整数总是最大值下面的程序演示了PriorityBlockingQueue中的remainingCapacity（）方法： 项目1：

JAVA

                         // Java Program Demonstrate remainingCapacity()                       
                         // method of PriorityBlockingQueue                       
           
                         import                                     java.util.concurrent.PriorityBlockingQueue;                       
           
                         public                                     class                                     GFG {                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 // define capacity of PriorityBlockingQueue                       
                                                 int                                     capacityOfQueue =                                     7                                     ;                       
           
                                                 // create object of PriorityBlockingQueue                       
                                                 PriorityBlockingQueue<Integer> pbq                       
                                                 =                                     new                                     PriorityBlockingQueue<Integer>(capacityOfQueue);                       
           
                                                 // Add element to PriorityBlockingQueue                       
                                                 pbq.put(                                     1                                     );                       
                                                 pbq.put(                                     2                                     );                       
                                                 pbq.put(                                     3                                     );                       
                                                 pbq.put(                                     4                                     );                       
           
                                                 // find remaining Capacity  of pbq                       
                                                 // using remainingCapacity() method                       
           
                                                 // The initial capacity was set to 7                       
                                                 // by passing as parameter in constructor                       
                                                 // But this method will return Integer.MAX_VALUE                       
                                                 int                                     remainingCapacity = pbq.remainingCapacity();                       
           
                                                 // print result                       
                                                 System.out.println(                                     "Queue:  "                                     + pbq);                       
                                                 System.out.println(                                     "Remaining Capacity: "                                     + remainingCapacity);                       
                                                 }                       
                         }                       

输出：

Queue:  [1, 2, 3, 4]Remaining Capacity: 2147483647

项目2： 使用字符串演示remainingCapacity（）

JAVA

                         // Java Program Demonstrate remainingCapacity()                       
                         // method of PriorityBlockingQueue                       
           
                         import                                     java.util.concurrent.PriorityBlockingQueue;                       
           
                         public                                     class                                     GFG {                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
           
                                                 // create object of PriorityBlockingQueue                       
                                                 PriorityBlockingQueue<String> pbq                       
                                                 =                                     new                                     PriorityBlockingQueue<String>();                       
           
                                                 // Add element to PriorityBlockingQueue                       
                                                 pbq.put(                                     "Geeks"                                     );                       
                                                 pbq.put(                                     "forGeeks"                                     );                       
                                                 pbq.put(                                     "A Computer"                                     );                       
                                                 pbq.put(                                     "Portal"                                     );                       
           
                                                 // find remaining Capacity  of pbq                       
                                                 // using remainingCapacity() method                       
                                                 int                                     remainingCapacity = pbq.remainingCapacity();                       
           
                                                 // print result                       
                                                 System.out.println(                                     "Queue:  "                                     + pbq);                       
                                                 System.out.println(                                     "Remaining Capacity: "                                     + remainingCapacity);                       
                                                 }                       
                         }                       

输出：

Queue:  [A Computer, Portal, Geeks, forGeeks]Remaining Capacity: 2147483647

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