CHECK ARRAY IN AN ARRAYLIST CONTAINS A CERTAIN VALUE

Norman Reedus

Total Post:45

Points:315
Posted by  Norman Reedus
Java 
 1196  View(s)
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I have an array list which contains arrays of type String. I create the array list and add arrays to it with the following code:

List<String[]> transaction = new ArrayList<String[]>();

 

String[] transactionLine = new String[7];

transactionLine[0] = "0";

transactionLine[1] = "1";

//.....

transactionLine[6] = "some value";

 

transactionLines.add(transactionLine);

Now I want to test if one of the arrays contain a certain value. I tried it like this, but then it checks for an array and not an element of an array:

if(transactionLines.contains("some value")) {

     //Do some

}


  1. Manoj Bhatt

    Post:154

    Points:1086
    Re: Check array in an arraylist contains a certain value

    try this:

    public class Test {

     

        public static void main(final String[] args) {

            final List<TransactionLine> transaction = new ArrayList<>();

     

            transaction.add(new TransactionLine(1, "some value"));

            transaction.add(new TransactionLine(2, "another value"));

            transaction.add(new TransactionLine(3, "yet another value"));

     

            System.out.println(containsName(transaction, "some value"));

            System.out.println(containsName(transaction, "non-existent value"));

        }

        private static boolean containsName(final List<TransactionLine> transaction, final String search) {

            for (final TransactionLine transactionLine : transaction) {

                if (transactionLine.getName().equals(search)) {

                    return true;

                }

            }

     

            return false;

        }

     

        private static class TransactionLine {

     

            private int id;

     

            private String name;

     

            public TransactionLine(final int id, final String name) {

                this.id = id;

                this.name = name;

            }

     

            public int getId() {

                return id;

            }

     

            public void setId(final int id) {

                this.id = id;

            }

     

            public String getName() {

                return name;

            }

     

            public void setName(final String name) {

                this.name = name;

            }

     

        }

     

    }

    Here is an example with two classes (Transaction and TransactionLine):

    public class Test {

     

        public static void main(final String[] args) throws Exception {

            final Transaction transaction = new Transaction();

     

            transaction.add("some name");

            transaction.add("another name");

            transaction.add("yet another name");

     

            System.out.println(transaction.containsName("some name"));

            System.out.println(transaction.containsName("non-existent name"));

        }

     

    }

    Transaction:

    import java.util.ArrayList;

    import java.util.List;

     

    public class Transaction {

     

        private final List<TransactionLine> transactionLines = new ArrayList<>();

     

        public void add(final String name) {

            final TransactionLine tl = new TransactionLine(transactionLines.size(), name);

     

            transactionLines.add(tl);

        }

     

        public boolean containsName(final String name) {

            for (final TransactionLine transactionLine : transactionLines) {

                if (transactionLine.getName().equals(name)) {

                    return true;

                }

            }

     

            return false;

        }

     

    }

    TransactionLine:

    public class TransactionLine {

     

        private int id;

     

        private String name;

     

        public TransactionLine() {

        }

     

        public TransactionLine(final int id, final String name) {

            this.id = id;

            this.name = name;

        }

     

        public int getId() {

            return id;

        }

     

        public void setId(final int id) {

            this.id = id;

        }

     

        public String getName() {

            return name;

        }

     

        public void setName(final String name) {

            this.name = name;

        }

     

    }

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