private static void main(String[] args) {
RandomizedQueue<String> rq = new RandomizedQueue<String>();
rq.enqueue("hello");
rq.enqueue(", ");
rq.enqueue("world");
rq.enqueue("!");
System.out.println(rq);
System.out.printf("size: %d\n", rq.size());
System.out.printf("sample %s\n", rq.sample());
System.out.printf("sample %s\n", rq.sample());
System.out.printf("dequeue %s\n", rq.dequeue());
System.out.printf("dequeue %s\n", rq.dequeue());
System.out.println(rq);
System.out.printf("size: %d\n", rq.size());
}
/**
* Unit testing
*
* @param args the program arguments
*/
public static void main(String[] args) {
RandomizedQueue<String> queue = new RandomizedQueue<>();
queue.enqueue("rieck");
queue.enqueue("andrew");
queue.enqueue("thomas");
assert (queue.size() == 3);
assert (!queue.isEmpty());
for (String t : queue) {
StdOut.println(t);
}
queue.sample();
queue.dequeue();
queue.dequeue();
queue.dequeue();
assert (queue.isEmpty());
queue.enqueue("lily");
queue.enqueue("caleb");
queue.enqueue("aaron");
assert (queue.size() == 3);
assert (!queue.isEmpty());
int i = 0;
for (String t : queue) {
StdOut.println(t);
for (String u : queue) {
StdOut.println(" " + u);
i++;
}
}
assert (i == 9);
}
public static void main(String[] args) {
// Test case: NullPointer when adding null to RandomizedQueue.
RandomizedQueue<String> rq = new RandomizedQueue<String>();
try {
String str = null;
rq.enqueue(str);
StdOut.println("Test should throw java.lang.NullPointerException: " + "FAIL!");
} catch (java.lang.NullPointerException e) {
StdOut.println("Test should throw java.lang.NullPointerException: " + "Successfull!");
}
// Test case: Throw java.util.NoSuchElementException when randomizedQueue
// is empty and someone tries to remove an item.
rq = new RandomizedQueue<String>();
try {
rq.dequeue();
StdOut.println("Test should throw " + "java.util.NoSuchElementException: FAIL!");
} catch (java.util.NoSuchElementException e) {
StdOut.println("Test should throw " + "java.util.NoSuchElementException: Successfull!");
}
// Test case: Add some stuff and show samples.
rq = new RandomizedQueue<String>();
// Make 0,1,2,3,4,5,6,7
rq.enqueue("7");
rq.enqueue("6");
rq.enqueue("5");
rq.enqueue("4");
rq.enqueue("3");
rq.enqueue("2");
rq.enqueue("1");
rq.enqueue("0");
// Sample should not remove entries.
for (int i = 0; i < 10; i++) {
StdOut.println(rq.sample());
}
StdOut.println("Next case.");
// dequeue should remove entries in random order.
for (int i = 0; i < 8; i++) {
String item = rq.dequeue();
StdOut.println(item);
}
try {
rq.dequeue();
StdOut.println("Test should throw " + "java.util.NoSuchElementException: FAIL!");
} catch (java.util.NoSuchElementException e) {
StdOut.println("Test should throw java.util." + "NoSuchElementException: Successfull!");
}
for (int i = 0; i < 2; i++) {
// Make 0,1,2,3,4,5,6,7
rq.enqueue("7");
rq.enqueue("6");
rq.enqueue("5");
rq.enqueue("4");
rq.enqueue("3");
rq.enqueue("2");
rq.enqueue("1");
rq.enqueue("0");
for (String s : rq) StdOut.println(s);
StdOut.println();
}
}