A priority queue in Java is a special type of queue wherein all the elements are ordered as per their natural ordering or based on a custom Comparator supplied at the time of creation.
Comparator<String>stringLengthComparator=newComparator<String>(){ @Override publicintcompare(Strings1,Strings2){ returns1.length()-s2.length(); } }; /* The above Comparator can also be created using lambda expression like this => Comparator<String> stringLengthComparator = (s1, s2) -> { ret...
Comparator<String>stringLengthComparator=newComparator<String>(){ @Override publicintcompare(Strings1,Strings2){ returns1.length()-s2.length(); } }; /* The above Comparator can also be created using lambda expression like this => Comparator<String> stringLengthComparator = (s1, s2) -> { ret...
publicstaticvoidmain(String[]args){// 创建优先级队列,指定队列初始大小 指定队列中的任务比较器// 优先级队列是无界的 指定的只是初始大小// 可以使用lambda简化PriorityBlockingQueue queue=newPriorityBlockingQueue(100,newComparator<TestRunnable>(){@Overridepublicintcompare(TestRunnable o1,TestRunnable o2){retu...
只不过使用Lambda表达式更加优雅// 如果只是想实现降序或者升序,可以使用Comparator.reverseOrder()或Comparator.naturalOrder()PriorityBlockingQueue<Integer>priorityBlockingQueue=newPriorityBlockingQueue(20,Comparator.naturalOrder());priorityBlockingQueue.add(6);priorityBlockingQueue.add(10);priorityBlockingQueue.add(2...
2.2. PriorityBlockingQueue Comparator example Let’s redefine the custom ordering usingJava 8 lambda based comparatorsyntax and verify the result. We are using constructorPriorityBlockingQueue(int initialCapacity, Comparator comparator). //Comparator for name field ...
Use the Custom Comparator to Specify the Element Ordering in C++ At first, we define avectorof strings used to initialize apriority_queue. Next, a lambda expression is defined to form the comparator function. The latter compares two strings by length. Now, we can declare apriority_queueobject...