java scanner file read

ScannerReadTest.java

package com.jeonguk;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ScannerReadTest {
    
    private static final Logger LOGGER = LoggerFactory.getLogger(ScannerReadTest.class);
    
    public static void main(String[] args) {
        if (args.length < 2) {
            LOGGER.info("Usage: java filePath findWord");
            System.exit(1);
        }
        
        String filePath = args[0];
        String findWord = args[1];
        LOGGER.info("ScannerRead word contains line find ");
        porcess(filePath, findWord);        
    }
    
    /**
     * This solution will iterate through all the lines in the file – allowing for processing of each line – 
     * without keeping references to them  i.e. without keeping them in memory.
     */
    public static void porcess(final String filePath, final String findWord) {

        long startTime = System.nanoTime();
        try (Scanner sc = new Scanner(new File(filePath), "UTF-8")) {
            
            long freeMemoryBefore = Runtime.getRuntime().freeMemory();
            
            LOGGER.info("freeMemoryBefore {} ", freeMemoryBefore );
            
            while (sc.hasNextLine()) {
                
                String line = sc.nextLine();
                if (line.contains(findWord)) {
                    LOGGER.info("line {} ", line );
                    // parse line
                    //System.out.println(line);
                }
            }
            
            // note that Scanner suppresses exceptions
            if (sc.ioException() != null) {
                sc.ioException().printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
            
        long endTime = System.nanoTime();
        long elapsedTimeInMillis = TimeUnit.MILLISECONDS.convert((endTime - startTime), TimeUnit.NANOSECONDS);
        LOGGER.info("Completed in {} milliseconds", elapsedTimeInMillis);
    }
    
}

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