substring.Static.java Source code

Introduction

Here is the source code for substring.Static.java

Source

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package substring;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import org.apache.commons.lang.StringUtils;

public class Static {

    public static String substring(String content, int startIndex, int endIndex) {
        return new String(content.substring(startIndex, endIndex));
    }

    public static void main(String[] args) throws Throwable {

        Runtime rt = Runtime.getRuntime();
        double alloc = rt.totalMemory() / 1000.0;
        double free = rt.freeMemory() / 1000.0;

        System.out.printf("Allocated (before substring operation) : %.2f kb\nFree: %.2f kb\n\n", alloc, free);
        Scanner in = new Scanner(new File("my_file.txt"));
        List<String> al = new ArrayList<String>();

        while (in.hasNextLine()) {
            String s = in.nextLine();
            /* Problem Code */
            //al.add(s.substring(0, 200)); // extracts first 200 characters
            /* Solution Code */
            //al.add(new String(s.substring(0,200))); 
            /* Using static menthod */
            // al.add(substring(s, 0, 200));
            /* Using apache */
            al.add(StringUtils.substring(s, 0, 200));
        }

        alloc = rt.totalMemory() / 1000.0;
        free = rt.freeMemory() / 1000.0;
        System.out.printf("\nAllocated (after substring operation): %.2f kb\nFree: %.2f kb\n\n", alloc, free);

        in.close();
        System.gc();

        alloc = rt.totalMemory() / 1000.0;
        free = rt.freeMemory() / 1000.0;
        System.out.printf("\nAllocated (after System.gc() operation):: %.2f kb\nFree: %.2f kb\n\n", alloc, free);
    }
}