PriorityBlockingQueue remainingCapacity() method in Java
Last Updated :
11 Jul, 2025
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The remainingCapacity method of PriorityBlockingQueue is used to check how much more elements can be inserted into this queue. But since the PriorityBlockingQueue is unbounded, this method always returns Integer.MAX_VALUE because a PriorityBlockingQueue is not capacity constrained.
Syntax:
public int remainingCapacity()
Return Value: Integer.MAX_VALUE always
Below programs illustrate remainingCapacity() method in PriorityBlockingQueue:
Program 1:
// 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);
}
}
Output:
Queue: [1, 2, 3, 4] Remaining Capacity: 2147483647
Program 2: To demonstrate remainingCapacity() using String
// 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);
}
}
Output:
Queue: [A Computer, Portal, Geeks, forGeeks] Remaining Capacity: 2147483647
