Write a non-recursive Java method for printing all permutations of the numbers {1,2, ..., n}
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Write a non-recursive Java method for printing all permutations of the numbers {1,2, ..., n}
Hint: use an explicit stack
public class QueueByStack<E> {
Stack<E> a = new Stack<>();
Stack<E> b = new Stack<>();
public int size() {
//write code here
}
public boolean isEmpty() {
//write code here
}
public void eneque(E e) {
//write code here
}
public E deque() {
//write code here
}
public E first() {
//write code here
}
@Override
public String toString() {
//write code here
}
}
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Solved in 2 steps
- Create Pseudocode for this class Queue { private static int front, rear, capacity; private static int queue[]; Queue(int c) { front = rear = 0; capacity = c; queue = new int[capacity]; } static void queueEnqueue(int data) { if (capacity == rear) { System.out.printf("\nQueue is full\n"); return; } else { queue[rear] = data; rear++; } return; } static void queueDequeue() { if (front == rear) { System.out.printf("\nQueue is empty\n"); return; } else { for (int i = 0; i < rear - 1; i++) { queue[i] = queue[i + 1]; } if (rear < capacity) queue[rear] = 0; rear--; } return; } static void queueDisplay() { int i; if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; } for (i = front; i < rear; i++) { System.out.printf(" %d <-- ", queue[i]); } return; } static void queueFront() { if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; } System.out.printf("\nFront…please convert this into c++ import java.util.Iterator;import java.util.NoSuchElementException; public class Queue<Item> implements Iterable<Item> { private int n; // number of elements on queue private Node first; // beginning of queue private Node last; // end of queue // helper linked list class private class Node { private Item item; private Node next; } /** * Initializes an empty queue. */ public Queue() { first = null; last = null; n = 0; } /** * Returns true if this queue is empty. * * @return {@code true} if this queue is empty; {@code false} otherwise */ public boolean isEmpty() { return first == null; } /** * Returns the number of items in this queue. * * @return the number of items in this queue */ public int size() { return n; } /** * Returns the number of items in this queue. * * @return the…class Queue { private static int front, rear, capacity; private static int queue[]; Queue(int size) { front = rear = 0; capacity = size; queue = new int[capacity]; } // insert an element into the queue static void queueEnqueue(int item) { // check if the queue is full if (capacity == rear) { System.out.printf("\nQueue is full\n"); return; } // insert element at the rear else { queue[rear] = item; rear++; } return; } //remove an element from the queue static void queueDequeue() { // check if queue is empty if (front == rear) { System.out.printf("\nQueue is empty\n"); return; } // shift elements to the right by one place uptil rear else {…
- Modify the Java class for the abstract stack type shown belowto use a linked list representation and test it with the same code thatappears in this chapter. class StackClass {private int [] stackRef;private int maxLen,topIndex;public StackClass() { // A constructorstackRef = new int [100];maxLen = 99;topIndex = -1;}public void push(int number) {if (topIndex == maxLen)System.out.println("Error in push–stack is full");else stackRef[++topIndex] = number;}public void pop() {if (empty())System.out.println("Error in pop–stack is empty"); else --topIndex;}public int top() {if (empty()) {System.out.println("Error in top–stack is empty");return 9999;}elsereturn (stackRef[topIndex]);}public boolean empty() {return (topIndex == -1);}}An example class that uses StackClass follows:public class TstStack {public static void main(String[] args) {StackClass myStack = new StackClass();myStack.push(42);myStack.push(29);System.out.println("29 is: " + myStack.top());myStack.pop();System.out.println("42 is:…class Queue { private static int front, rear, capacity; private static int queue[]; Queue(int c) { front = rear = 0; capacity = c; queue = new int[capacity]; } static void queueEnqueue(int data) { if (capacity == rear) { System.out.printf("\nQueue is full\n"); return; } else { queue[rear] = data; rear++; } return; } static void queueDequeue() { if (front == rear) { System.out.printf("\nQueue is empty\n"); return; } else { for (int i = 0; i < rear - 1; i++) { queue[i] = queue[i + 1]; } if (rear < capacity) queue[rear] = 0; rear--; } return; } static void queueDisplay() { int i; if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; } for (i = front; i < rear; i++) { System.out.printf(" %d <-- ", queue[i]); } return; } static void queueFront() { if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; } System.out.printf("\nFront Element is: %d", queue[front]);…Java Files Recursive.java RecursiveDemo.java The purpose of the assignment is to practice writing methods that are recursive. We will write four methods each is worth 15 points. a- int sum_sqr_rec(stack<int> stk) which will receive a stack of "int" and output the sum of the squares of the elements in the stack. b- int plus_minus_rec(stack<int> stk) which will receive a stack of "int" (example: {a,b,c,d,e,f,g,h,i,j}) and output the sum of the elements in the stack as follows: a - b + c - d + e - f + g - h + i -j c- void prt_chars_rev_rec(stack<char> stk) which will receive a stack of "char" and print its elements in reverse. d- void prt_chars_rec(queue<char> stk) which will receive a queue of "char" and print its elements Remember to use the stack and queue STL. The Assignment will require you to create 2 files: Recursive.java which contains the details of creating the 4 methods as specified above: int sum_sqr_rec(stack<int> stk), (15 points)…
- The implementation of a queue in an array, as given in this chapter, uses the variable count to determine whether the queue is empty or full. You can also use the variable count to return the number of elements in the queue. On the other hand, class linkedQueueType does not use such a variable to keep track of the number of elements in the queue. Redefine the class linkedQueueType by adding the variable count to keep track of the number of elements in the queue. Modify the definitions of the functions addQueue and deleteQueue as necessary. Add the function queueCount to return the number of elements in the queue. Also, write a program to test various operations of the class you defined.Java Program, Dont Copy Consider a class Student that has an attribute age and a method getAge(): StudentList is a class representing a linkedlist of students. Write sumListAge_lterative......), a method that computes and returns the sum of the ages of all students in the list using the iterative way. Parameters of the method should be specified accordinglyFinish this code: import java.util.Scanner;import java.util.Stack; /** Class for reversing the order of a sentence.*/public class SentenceReverser{ /** Reverses the given sentence. @param sentence Sentence to be reversed. @return Reversed sentence. */ public static String reverse(String sentence) { String reversed = ""; Scanner scanner = new Scanner(sentence); Stack<String> stack = new Stack<String>(); // put your work below // ... return reversed; } public static void main(String[] args) { String sentence = "Mary had a little lamb. Its fleece was white as snow."; String reversed = SentenceReverser.reverse(sentence); System.out.println("Given: " + sentence); System.out.println("Expected: Lamb little a had mary. Snow as white was fleece its."); System.out.println("Actual: " + reversed); }}
- Create a simple Pseudocode for this Java Program Thank You class Queue { private static int front, rear, capacity; private static int queue[]; Queue(int c) { front = rear = 0; capacity = c; queue = new int[capacity]; } static void queueEnqueue(int data) { if (capacity == rear) { System.out.printf("\nQueue is full\n"); return; } else { queue[rear] = data; rear++; } return; } static void queueDequeue() { if (front == rear) { System.out.printf("\nQueue is empty\n"); return; } else { for (int i = 0; i < rear - 1; i++) { queue[i] = queue[i + 1]; } if (rear < capacity) queue[rear] = 0; rear--; } return; } static void queueDisplay() { int i; if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; } for (i = front; i < rear; i++) { System.out.printf(" %d <-- ", queue[i]); } return; } static void queueFront() { if (front == rear) { System.out.printf("\nQueue is Empty\n"); return; }…don't use others answers java 1. Write a generic static method that takes a Stack of any type element as a parameter, pops each element from the stack, and prints it. It should have a type parameter that represents the Stack’s element type.Recall the array-based implementation of the Stack class: public class Stack<E> { private void grow() {...} private void push(E data) {...} private Object[] stack = new Object[10]; private int top; } Implement the "grow" method so that when it is called by the "push" method when the stack array is full, it doubles the size of the stack array.