CIS 260 Chapter16b.java

Code

/*
    Chapter16b.java
    CIS 260
    David Klick
    2016-02-15

    This program demonstrates file input using Files.readAllLines
    and the String methods startsWith, endsWith, and indexOf.
*/

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.FileSystems;
import java.nio.charset.Charset;
import java.util.List;
import java.util.ArrayList;
import java.io.IOException;

public class Chapter16b {
    private static final boolean DISPLAY = true;

    public static void main(String[] args) {
        int match = 0;
        List<String> lines;
        String pat = "kab";
        
        try {
            Path path = FileSystems.getDefault().getPath("", "dict.txt");
            lines = Files.readAllLines(path, Charset.defaultCharset());
            int pos = 0;
            
            match = 0;
            System.out.println("Starts with " + pat);
            for (String line : lines) {
                if (line.startsWith(pat)) {
                    if (DISPLAY) System.out.println(line);
                    match++;
                }
            }
            if (match == 0) System.out.println("No matches found\n");
            else System.out.println(match + " matches found\n");
            
            match = 0;
            System.out.println("Ends with " + pat);
            for (String line : lines) {
                if (line.endsWith(pat)) {
                    if (DISPLAY) System.out.println(line);
                    match++;
                }
            }
            if (match == 0) System.out.println("No matches found\n");
            else System.out.println(match + " matches found\n");

            match = 0;
            System.out.println("Index of " + pat);
            for (String line : lines) {
                if ((pos = line.indexOf(pat)) != -1) {
                    if (DISPLAY) System.out.println(line + ": Match found at position " + pos);
                    match++;
                }
            }
            if (match == 0) System.out.println("No matches found\n");
            else System.out.println(match + " matches found\n");

        } catch (IOException e) {
            System.out.println("Error opening or reading input file");
        }
    }
}