java.lang.NumberFormatException error in eclipse when parsing an int

Question

I'm trying to use the stopwatch class to measure the speed at which my code runs on ArrayList vs. LinkedList. I continue to get this error when I try to compile my code.

Exception in thread "main" java.lang.NumberFormatException: For input string: "java"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at SortTest.main(SortTest.java:10)

My code looks like this:

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;


public class SortTest {

public static void main(String[] args) {

    final int N = Integer.parseInt(args[0]);
    ArrayList<Integer> thelist = new ArrayList();
    int x = 1;
    while (x < N) {
        thelist.add(x);
    }

    final Random RNG = new Random (Long.getLong("seed", System.nanoTime()));
    Collections.shuffle(thelist, RNG);

    /////////////
    //STOPWATCH//
    /////////////

    final StopWatch sw = new StopWatch(true);
    for (int i = 0; i < 25; i++) {
        sw.start();

        int smaller = 0;
        int smallerindex = 0;
        int b = 0;
        for(int a = 1; a <thelist.size(); a++) {
            smaller = thelist.get(a - 1);
            smallerindex = a - 1;
            for(b = a; b <thelist.size(); b++) {
                if(thelist.get(b) < smaller) {
                    smaller = thelist.get(b);
                    smallerindex = b;
                }
            }
            if (smallerindex ==  a) {
                //no action
            } else {
            int temp = thelist.get(a);
            thelist.set(a, thelist.get(smallerindex));
            thelist.set(smallerindex, temp);
            }  
        }

        sw.stop();
    }
    final double averageTime = sw.getAverageTime();

    System.out.println(averageTime);
}
}

my command line input looks like this:

java -Dseed=4321567 SortTest 200 java.util.ArrayList

I tried initializing N to 0 and 1, and the error wasn't there anymore. As soon as I set N to 2, the error came back. So what I'm getting from this is there's something wrong with N > 1. But I have no idea what exactly is causing the error. Help would be appreciated.

Consider accepting some of the answers to your previous questions please. You've asked eight, have received answers for 7, but haven't accepted any. — Hovercraft Full Of Eels, Mar 25 '15 at 00:33

score 2 · Answer 1 · answered Mar 25 '15 at 00:35

2

Why don't you try debugging it yourself. Here's how you can get started.

for(int i = 0; i < args.length; i++){
  System.out.println("Arg "+i+" is: "+args[i]);
}

answered Mar 25 '15 at 00:35

satnam

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java.lang.NumberFormatException error in eclipse when parsing an int

1 Answers1