CODEWITHSUNDEEP
java
Ermalb
Ermalb

Reputation: 1

Compare two lists and get unique list (example.txt) java

I found here a good code that will help me to finish a thing to do. But what I need: I have two lists, one list is example1.txt and sencond list is example2.txt I need to get similar and different. I dont know where to set the c://example1.txt and c://example2.txt

for example: Arrays.asList(c://example1.txt);

import java.util.Collection;
import java.util.HashSet;
import java.util.Arrays;

class Repeated {
      public static void main( String  [] args ) {

          Collection<String> listOne = Arrays.asList("1","2","3");

          Collection<String> listTwo = Arrays.asList("1","2","2");

          Collection<String> similar = new HashSet<String>( listOne );
          Collection<String> different = new HashSet<String>();
          different.addAll( listOne );
          different.addAll( listTwo );

          similar.retainAll( listTwo );
          different.removeAll( similar );

          System.out.printf("One:%s%nTwo:%s%nSimilar:%s%nDifferent:%s%n", listOne, listTwo, similar, different);
      }
}

Upvotes: 0

Views: 1471

Answers (2)

Peter Lawrey
Peter Lawrey

Reputation: 533500

Sounds like homework, but I will bite. I would use FileUtils

Set<String> example1 = new LinkedHashSet<String>(
                               FileUtils.readLines(new File(args[0])));
Set<String> example2 = new LinkedHashSet<String>(
                               FileUtils.readLines(new File(args[1])));
Set<String> same = new LinkedHashSet<String>(example1);
same.retainAll(example2);
Set<String> different = new LinkedHashSet<String>(example1);
different.removeAll(example2);

if you have one , between values you can use

Set<String> example1 = new LinkedHashSet<String>(
   Arrays.asList(FileUtils.readFileToString(new File(args[0])).split("[,\\s]")));

Upvotes: 2

Bozho
Bozho

Reputation: 597076

As far as I understand, you don't know how to read the text files to lists. There are many options:

  • commons-io IOUtils.readLines(new FileInputStream("c:/example.txt"))
  • use new BufferedInputStream(new FileInputStream(..)) and then loop using the readLine() method

To handle encoding properly you will need to use new InputStreamReader(inputStream, "utf-8")

Update:

It seems your file contains only one line. Using the FileUtils that Peter reminded me of:

String str = FileUtils.readFileToString("c:/filename.txt");
String[] numbers = str.split(",");
List<String> list = Arrays.asList(numbers);

Upvotes: 4

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