Question
Write a method called printDuplicates that takes as a parameter a Scanner containing a series of lines. Your
method should examine each line looking for consecutive occurrences of the same token on the same line and print each duplicated token, along with the number of times that it appears consecutively. Nonrepeated tokens are notnprinted. You may ignore the case of repetition across multiple lines (such as if a line ends with a given token and the next line starts with the same token). You may assume that each line of the file contains at least 1 token of input. For example, consider the following input:
hello how how are you you you you
I I I am Jack's Jack's smirking smirking smirking smirking revenge
bow wow wow yippee yippee yo yippee yippee yay yay yay
one fish two fish red fish blue fish
It's the Muppet Show, wakka wakka wakka
Your method should produce the following output:
how*2 you*4
I*3 Jack's*2 smirking*4
wow*2 yippee*2 yippee*2 yay*3
wakka*3
Answer
package chap456;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class PrintDuplicates {
public static void printDuplicates(Scanner input) {
// keep reading from the input till end of the line
while (input.hasNextLine()) {
// set current string to null
String currentString = null;
Scanner line = new Scanner(input.nextLine());
int count = 0;
while (line.hasNext()) {
String nextLine = line.next();
// if the next line equals the current string increase the count
if (nextLine.equals(currentString)) {
count += 1;
} else {
if (count > 1)
System.out.print(currentString + "*" + count + " ");
// set current string to next line
currentString = nextLine;
count = 1;
}
}
if (count > 1)
System.out.print(currentString + "*" + count);
System.out.println();
}
}
// driver method
public static void main(String[] args) throws FileNotFoundException {
String str = System.getProperty("user.dir") + "\\resources\\printDuplicates.txt";
File file = new File(str);
Scanner input = new Scanner(file);
printDuplicates(input);
}
}
input file: printDuplicates.txt
hello how how are you you you you
I I I am Jack's Jack's smirking smirking smirking smirking revenge
bow wow wow yippee yippee yo yippee yippee yay yay yay
one fish two fish red fish blue fish
It's the Muppet Show, wakka wakka wakka
Output:
how*2 you*4
I*3 Jack's*2 smirking*4
wow*2 yippee*2 yippee*2 yay*3
wakka*3