queu.java

public class Queue  //stating class 
{
	int front , rear ,e, queSize , queArr[]; // initialized 


	Queue(int size) //constructor 
	{
		this.queSize=size;
		this.queArr=new int[queSize];
		this.front=-1;
		this.rear=-1;
	
	}
	
	public void EnQueue(int e) //method for input data in Queue
	{
		if (front==-1) //check Queue is empety or not
			front=0;   // if yes then initialized it with zero
		
		if(rear==(queSize-1)) // check Queue is full or not
			System.out.println("overflow"); // if full the over flow
		
		else
			rear=rear+1; 
		    queArr[rear]=e; // add data in rear of Queue
	}
	
	public int DeQueue() // method of delete data from Queue
	{
		if((front==-1) || (front>rear))  // check Queue either  empety or "rear is greater then front"
			System.out.println("underflow"); //if yes then show underflow
		
		else 
			e =queArr[front];   // delete data from Queue
			front=front+1;
		
			return e;  // value return to method
			
	}
	
	public void display()  // method of display the Queue
	{
		System.out.println("The data in the Queue");
		for(int i=front; i<=rear; i++)     // start loop from front to rear
			System.out.println(queArr[i]);
		
	}
	
	public static void main(String args[])
	{
		Queue obj=new Queue(5); // you will change the size of array 
		obj.EnQueue(1111); //input data
		obj.EnQueue(2222); //input data
		obj.EnQueue(3333); //input data
		obj.EnQueue(4444); //input data
		obj.EnQueue(5555); //input data
		obj.display();
		
		obj.DeQueue(); //delete data
		obj.DeQueue(); //delete data
		obj.display();
		
	}
	
	
	
	

} // end of Queue class