CODEWITHSUNDEEP
java
Adam Amin
Adam Amin

Reputation: 1456

Finding a line that contain a string using contains method

I have two files:

One is a CSV file that contains the following:

Class
weka.core.Memory
com.google.common.base.Objects
client.network.ForwardingObserver

Second is a txt file that contains the following:

1_tullibee  com.ib.client.ExecutionFilter
107_weka    weka.core.Memory
101_netweaver   com.sap.managementconsole.soap.axis.sapcontrol.HeapInfo
107_weka    weka.classifiers.Evaluation
guava   com.google.common.base.Objects
57_hft-bomberman    client.network.ForwardingObserver
18_jsecurity    org.jsecurity.web.DefaultWebSecurityManager

I would like to retrieve the lines in the txt files that contain the classes in the CSV file. To do so:

try (BufferedReader br = new BufferedReader(new FileReader("/home/nasser/Desktop/Link to Software Testing/Experiments/running_scripts/exp_23/run3/CSV/MissingClasses_RW_No_Reduction.csv"))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println("==>> " + line);

        Scanner scanner = new Scanner(new File("/home/nasser/Desktop/Link to Software Testing/Experiments/running_scripts/exp_23/selection (copy).txt"));

        while (scanner.hasNextLine()) {
            String currentLine = scanner.nextLine();

            if(currentLine.contains("**>> " + line)){
                System.out.println(currentLine);
            }else {
                System.out.println("not found");
            }
        }
    }
}

When I run it, I get not found with all the classes in the CSV which is not the case I expect. I expect the following lines to be printed:

107_weka    weka.core.Memory
guava   com.google.common.base.Objects
57_hft-bomberman    client.network.ForwardingObserver

How to solve that?

Upvotes: 0

Views: 112

Answers (2)

Luis Iñesta
Luis Iñesta

Reputation: 421

Just my two cents: If you're using Java 8, and the CSV file is relatively small, you can simply do this:

List<String> csvLines = Files.lines(Paths.get(csvFilename))).collect(Collectors.toList());
Files.lines(Paths.get(txtFileName)))
 .filter(txtLine -> csvLines.stream().anyMatch(txtLine::contains))
 .forEach(System.out::println);

Upvotes: 1

user85421
user85421

Reputation: 29700

If you don't want the not found and the ==>> * output, just delete the corresponding lines of code

try (BufferedReader br = new BufferedReader(new FileReader("csv.txt"))) {
    String line;
    while ((line = br.readLine()) != null) {
        Scanner scanner = new Scanner(new File("copy.txt"));

        while (scanner.hasNextLine()) {
            String currentLine = scanner.nextLine();

            if (currentLine.contains(line)) {
                System.out.println(currentLine);
            }
        }

        scanner.close();  // added this, could use try-with but that is *advanced*
    }
}

this will generate the following output, exactly as requested:

107_weka    weka.core.Memory
guava   com.google.common.base.Objects
57_hft-bomberman    client.network.ForwardingObserver

obviously used files located in my folder...

Upvotes: 1

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