Example usage for java.util EmptyStackException printStackTrace

Introduction

In this page you can find the example usage for java.util EmptyStackException printStackTrace.

Prototype

public void printStackTrace() 

Source Link

Document

Prints this throwable and its backtrace to the standard error stream.

Usage

From source file:Main.java

public static void main(String args[]) {
    Stack st = new Stack();
    System.out.println("stack: " + st);
    st.push(new Integer(42));
    System.out.println("push(" + 42 + ")");
    System.out.println("stack: " + st);

    System.out.print("pop -> ");
    Integer a = (Integer) st.pop();
    System.out.println(a);//from w  w  w.ja v a2s.  c  o  m
    System.out.println("stack: " + st);

    try {
        st.pop();
    } catch (EmptyStackException e) {
        e.printStackTrace();
        System.out.println("empty stack");
    }
}

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From source file:ch.zhaw.icclab.tnova.expressionsolver.OTFlyEval.java

String evaluateExpression(String exp, Stack<Double> param, double threshold) {
    String[] literals = exp.split("(?!^)"); //array of characters
    String tempVal = "";
    Stack<String> sTable = new Stack<String>();
    for (int i = 0; i < literals.length; i++) {
        if (literals[i].equals("(")) {
            if (tempVal.trim().length() != 0) {
                sTable.push("fn " + tempVal.trim());
                logger.info("pushed function [" + tempVal.trim() + "] into stack.");
            } else {
                //parsing error this stage is not allowed
            }//from  w  w w.  j  a  v  a 2 s  . co  m
            tempVal = "";
        } else if (literals[i].equals(",")) {
            if (tempVal.trim().length() != 0) {
                sTable.push("pm " + tempVal.trim());
                logger.info("pushed parameter [" + tempVal.trim() + "] into stack.");
            } else {
                //parsing error this stage is not allowed
            }
            tempVal = "";
        } else if (literals[i].equals(")")) {
            if (tempVal.trim().length() != 0) {
                sTable.push("pm " + tempVal.trim());
                logger.info("pushed parameter [" + tempVal.trim() + "] into stack.");
            }

            logger.info("Proceeding for partial stack evaluation.");
            tempVal = "";
            //proceed to partial evaluation
            try {
                String output = partialEvaluation(sTable, param, threshold);
                //push the result back into stack as a literal
                sTable.push("pm " + output);
                logger.info("pushed parameter [" + output + "] into stack for further processing.");
            } catch (EmptyStackException emex) {
                logger.warn("Malformed expression and value set received.");
                if (App.showExceptions)
                    emex.printStackTrace();
                return null;
            }
        } else
            tempVal += literals[i];
    }
    //if stack has more than 1 element error, else the only element is the result
    String result = "";
    if (sTable.size() != 1) {
        //error
        result = null;
    } else {
        result = sTable.pop().split(" ")[1];
    }
    return result;
}

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