Im trying to figure out a java homework assignment where I have to evaluate postfix expressions using stacks and Stringtokenizer as well as a isNumber method. when I try to run it it gives me an error. this is the code I have so far:   static double evaluatePostfixExpression(String expression){     // Write your code       Stack aStack = new Stack();       double value1, value2;     String token;     StringTokenizer tokenizer = new StringTokenizer(expression);     while (tokenizer.hasMoreTokens()) {       token = tokenizer.nextToken();       if(isNumber(expression)) {         value1 = (double)aStack.pop();         value2 = (double)aStack.pop();         if (token.equals("+")) {           aStack.push(value2+value1);         } else if (token.equals("-")) {           aStack.push(value2-value1);         } else if (token.equals("*")) {           aStack.push(value2*value1);         } else if (token.equals("/")) {           aStack.push(value2/value1);         }       }           }     Object lastValue = aStack.pop();     if (!aStack.isEmpty()) {       System.out.println("Stack has more operands than operators");       return Double.NEGATIVE_INFINITY;     }     else       return (double) lastValue;         //return -1;   }

Search is an interesting stack method in Java. Could you provide a small example of how you would program it's functionality in a created stack that you created?

OCaml Code: The goal of this project is to understand and build an interpreter for a small, OCaml-like, stackbased bytecode language. Make sure that the code compiles correctly and provide the code with the screenshot of the output. Make sure to have the following methods below:    -Push integers, strings, and names on the stack -Push booleans -Pushing an error literal or unit literal will push :error: or :unit:onto the stack, respectively -Command pop removes the top value from the stack -The command add refers to integer addition. Since this is a binary operator, it consumes the toptwo values in the stack, calculates the sum and pushes the result back to the stack - Command sub refers to integer subtraction -Command mul refers to integer multiplication -Command div refers to integer division -Command rem refers to the remainder of integer division -Command neg is to calculate the negation of an integer -Command swap interchanges the top two elements in the stack, meaning that the…

how to create an interface in java that contains the following methods: boolean myPush(T element);  // pushes element onto the stack; returns true if element successfully pushed, false otherwise boolean myPop();  // removes the top element of the stack; returns true if element successfully popped, false otherwise T myTop();  // if the stack is not empty returns the top element of the stack, otherwise returns null String toString();  // returns contents of the stack as a single String int size();  // return number of elements in the stack then create java file that Implements your interface that you created as a linked stack, then use the driver shown in screen shot to test. below is the code for the LLNode class  public class LLNode<T> { protected LLNode<T> link; protected T info; public LLNode(T info) { this.info = info; link = null; }   public void setInfo(T info) { this.info = info; } public T getInfo() { return info; } public void setLink(LLNode<T> link) {…