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Copy pathMyQueue.java
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45 lines (39 loc) · 990 Bytes
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package queue;
import java.util.Stack;
class MyQueue
{
Stack<Integer> stackForPush = new Stack<>();
Stack<Integer> stackForPop = new Stack<>();
// Push element x to the back of queue.
public void push(int x)
{
while ( !stackForPop.isEmpty() )
{
stackForPush.push( stackForPop.pop() );
}
stackForPush.push( x );
}
// Removes the element from in front of queue.
public void pop()
{
while ( !stackForPush.isEmpty() )
{
stackForPop.push( stackForPush.pop() );
}
stackForPop.pop();
}
// Get the front element.
public int peek()
{
while ( !stackForPush.isEmpty() )
{
stackForPop.push( stackForPush.pop() );
}
return stackForPop.peek();
}
// Return whether the queue is empty.
public boolean empty()
{
return stackForPush.isEmpty() && stackForPop.isEmpty();
}
}