VectorBenchmark1.java Source code

Introduction

Here is the source code for VectorBenchmark1.java

Source

import java.util.Vector;

public class VectorBenchmark1 {

    public static final int MaxSize = 100000;

    public static final int NTRIES = 10;

    public static void main(String[] args) {
        Vector v = new Vector();

        long start = System.currentTimeMillis();
        for (int i = 0; i < MaxSize; i++)
            v.add(new Integer(i));
        long end = System.currentTimeMillis();
        System.out.println("Allocating vector elements: " + (end - start) + " milliseconds");

        Integer[] integerArray = new Integer[1];
        start = System.currentTimeMillis();
        for (int i = 0; i < MaxSize; i++) {
            if (i >= integerArray.length) {
                Integer[] b = new Integer[i * 2];
                System.arraycopy(integerArray, 0, b, 0, integerArray.length);
                integerArray = b;
            }
            integerArray[i] = new Integer(i);
        }
        end = System.currentTimeMillis();
        System.out.println("Allocating array elements:  " + (end - start) + " milliseconds");

        start = System.currentTimeMillis();
        for (int j = 0; j < NTRIES; j++)
            for (int i = 0; i < MaxSize; i++) {
                Integer r = (Integer) v.get(i);
                v.set(i, new Integer(r.intValue() + 1));
            }
        end = System.currentTimeMillis();
        System.out.println("Accessing vector elements:  " + (end - start) + " milliseconds");

        start = System.currentTimeMillis();
        for (int j = 0; j < NTRIES; j++)
            for (int i = 0; i < MaxSize; i++) {
                Integer r = integerArray[i];
                integerArray[i] = new Integer(r.intValue() + 1);
            }
        end = System.currentTimeMillis();
        System.out.println("Accessing array elements:   " + (end - start) + " milliseconds");
    }
}