Modify the ListTest class so that we can insert integer data values representing

Question

Modify the ListTest class so that we can insert integer data values representing identification numbers (Ids). The link list should not store duplicate Ids. Stop inserting Ids when a value of 0 (zero) is input. import java.util.LinkedList; import java.util.Scanner; public class ListTest { private LinkedList< String > nameList; private Scanner scanner; public ListTest() { nameList = new LinkedList< String >(); scanner = new Scanner( System.in ); getNames(); searchNames(); } public void getNames() { System.out.println("Add a name to list, use end to terminate input:" ); String inputName = scanner.next(); while ( !inputName.equals( "end" ) ) { // insert name if ( foundName( inputName ) == false ) { insertName( inputName ); System.out.println( inputName + " inserted" ); } // end if else // name already exists in list System.out.println( inputName + " exists in list" ); System.out.println("Add a name to list, use end to terminate input:" ); inputName = scanner.next(); } // end while } // end method getNames public void searchNames() { System.out.println("Search a name, use end to terminate searching:" ); String inputName = scanner.next(); while ( !inputName.equals( "end" ) ) { if ( foundName( inputName ) ) System.out.println( inputName + " found in list" ); else // name not found System.out.println( inputName + " not found in list" ); System.out.println("Search a name, use end to terminate searching:" ); inputName = scanner.next(); } } public boolean foundName( String searchName ) { for ( String name : nameList ) { if ( searchName.equals( name ) ) return true; } return false; } public void insertName( String name ) { nameList.add( name ); }

Explanation / Answer

/*you may download the code from....http://www.2shared.com/file/yhigl9zs/ListTest.html*/ import java.util.Iterator; import java.util.LinkedList; import java.util.Scanner; public class ListTest { private LinkedList identificationNumList; private Scanner scanner; public ListTest() { identificationNumList = new LinkedList(); scanner = new Scanner(System.in); checkIdentificationNum(scanner.nextInt()); } public void checkIdentificationNum(int value) { int flag = 0; Iterator iIdsNum = identificationNumList.iterator(); while (iIdsNum.hasNext()) { if (value == iIdsNum.next()) { flag = 1; break; } } if (flag == 0 && value != 0) { insertIds(value); } } public void insertIds(int value) { identificationNumList.add(value); } } /*This is another code....use which ever you like....you may download the code from....http://www.2shared.com/file/k4oz3UET/ListTest.html*/ import java.util.Iterator; import java.util.LinkedList; import java.util.Scanner; public class ListTest { private LinkedList identificationNumList; public ListTest() { identificationNumList = new LinkedList(); } public boolean checkIdentificationNum(int value) { int flag = 0; Iterator iIdsNum = identificationNumList.iterator(); while (iIdsNum.hasNext()) { if (value == iIdsNum.next()) { flag = 1; break; } } if (flag == 1 || value == 0) { return true; } else { return false; } } public void insertIds(int value) { identificationNumList.add(value); } public void displayIds() { Iterator iIds = identificationNumList.iterator(); while (iIds.hasNext()) { System.out.println(iIds.next()); } } public static void main(String[] args) { ListTest lt = new ListTest(); boolean status; int intVal; for (int i = 0; i < 10; i++) { Scanner input = new Scanner(System.in); intVal = input.nextInt(); status = lt.checkIdentificationNum(intVal); if (status == false) { lt.insertIds(intVal); } } lt.displayIds(); } }

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