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MyQueue.java
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40 lines (34 loc) · 794 Bytes
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package Stack;
import java.util.Stack;
/*
232. Implement Queue using Stacks
*/
public class MyQueue {
Stack<Integer> mainStack;
Stack<Integer> helperStack;
public MyQueue() {
mainStack = new Stack<>();
helperStack = new Stack<>();
}
public void push(int x) {
while(!mainStack.isEmpty()){
helperStack.push(mainStack.pop());
}
helperStack.push(x);
while(!helperStack.isEmpty()){
mainStack.push(helperStack.pop());
}
}
public int pop() {
if (mainStack.isEmpty()){
return 0;
}
return mainStack.pop();
}
public int peek() {
return mainStack.peek();
}
public boolean empty() {
return mainStack.isEmpty();
}
}