I am learning stacks right now, I my code compiles find. When I run it, code will not print my debug println's and the error
Exception in thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.util.Arrays.copyOf(Arrays.java:2760)at java.util.Arrays.copyOf(Arrays.java:2734)at java.util.Vector.ensureCapacityHelper(Vector.java:226)at java.util.Vector.addElement(Vector.java:573)at java.util.Stack.push(Stack.java:50)at stacks.main(stacks.java:56)is displayed.
My code looks like:
import ch03.stacks.*;import java.util.*;public class stacks {public static void main (String []args){ System.out.printf("Enter a math equation in reverse polish notation:\n"); Stack<Double> pemdas = new Stack<Double>(); Scanner input = new Scanner(System.in); String in = input.next(); double temp1, temp2, resultant = 0; while(input.hasNext()){ if(in == "+"){ temp1 = pemdas.peek(); pemdas.pop(); temp2 = pemdas.peek(); pemdas.pop(); resultant = temp1 + temp2; pemdas.push(resultant); System.out.println(resultant); } if(in == "-"){ temp1 = pemdas.peek(); pemdas.pop(); temp2 = pemdas.peek(); pemdas.pop(); resultant = temp1 - temp2; pemdas.push(resultant); System.out.println(resultant); } if(in == "*"){ temp1 = pemdas.peek(); pemdas.pop(); temp2 = pemdas.peek(); pemdas.pop(); resultant = temp1 * temp2; pemdas.push(resultant); System.out.println(resultant); } if(in == "/"){ temp1 = pemdas.peek(); pemdas.pop(); temp2 = pemdas.peek(); pemdas.pop(); resultant = temp1 / temp2; pemdas.push(resultant); System.out.println(resultant); } else pemdas.push(Double.parseDouble(in)); System.out.println(resultant); } System.out.println("Answer:"+ resultant); }}So i first read in the the string of integers in Reverse Polish Notation and then if it is not an operatand, then i pop it on to my stack. At least that's what I think it is doing. Any help is greatly appreciated.