MinStack_Java

import java.util.*;
class MinStack {

Stack<Integer> stack = new Stack<Integer>();
Stack<Integer> minstack = new Stack<Integer>();


    public MinStack() {
        
    }
    
    public void push(int val) {
        
        stack.push(val);
        if(minstack.isEmpty() || val<=minstack.peek())
        minstack.push(val);
    }
    
    public void pop() {
        int temp= stack.pop();
        if(temp==minstack.peek())
        {
           
            minstack.pop();
        }
    }
    
    public int top() {
        return stack.peek();
    }
    
    public int getMin() {
        return minstack.peek();
    }
}

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack obj = new MinStack();
 * obj.push(val);
 * obj.pop();
 * int param_3 = obj.top();
 * int param_4 = obj.getMin();
 */