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QueueusingStack.java

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QueueusingStack.java

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import java.util.Stack;

public class QueueusingStack {

private Stack<Integer> first ;

private Stack<Integer> second ;

public QueueusingStack(){

first = new Stack<>();

second= new Stack<>();

}

public void add(int number){

first.push(number);

}

public int remove () throws Exception{

while (!first.isEmpty()){

second.push(first.pop());

}

int removed = second.pop();

while(!second.isEmpty()){

first.push(second.pop());

}

return removed ;

}

public int peek () throws Exception {

while (!first.isEmpty()){

second.push(first.pop());

}

int peeked = second.peek();

while(!second.isEmpty()){

first.push(second.pop());

}

return peeked ;

}

public boolean isEmpty () {

return first.isEmpty() ;

}

}