Constructors , paprameters and super


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Thread: Constructors , paprameters and super

  1. #1
    Join Date
    Jan 2004
    Posts
    10

    Constructors , paprameters and super

    When i instantiate an object with parameters " SubClient clientobjecttest = new SubClient(fsname,lsname,tphone,adss); "
    my code kicks out the following error


    C:\J2SDK1~1.2_0\BIN>javac reportprogram.java
    reportprogram.java:169: cannot resolve symbol
    symbol : constructor SubClient (java.lang.String,java.lang.String,int,java.lang
    .String)
    location: class SubClient
    SubClient clientobjecttest = new SubClient(fsname,lsname,tphone,adss);

    ^

    Thing is, if I donít include the parameters, it compiles ok, so I suspect I need to use super so I inserted it by where it says problem 1 in the code.

    Still I have this problem. Please could you help.




    Code:
    class Person{
    
    
    	void Person(String fsname,String lsname,int tphone,String adss) {
    	
    	
    	
    	}
    
    	// as of this moment i am unsure of how data will getinto these variable possile by the use of super
    	String firstname;
    	String lastname;
    	String address;
    	int telephonenumber;
    }
    
    
    class SubClient extends Person {
    
    
    	//creating a constructor to get variables ,because i dont seem to be able to the the class to exten as well as 
    	//take parameters.
    	
    		void SubClient(String fsname,String lsname,int tphone,String adss) {
    
    		super(fsname,lsname,tphone,adss);	 			// PROBLEM 1		
    			String testvalue = "test";
    			super.firstname = fsname;
    			super.lastname = lsname;
    			super.telephonenumber =tphone;		
    			super.address = adss;
    			System.out.println(testvalue);
    			// the line above is only for test
    		
    		
    		}
    	
    		void printclientdetails() {
    			
    		}
    		
    	
    
    }	
    
    
    class reportprogram {
    	public static void main(String args[])throws IOException{
    
    	// thes variables for testing	
    	String destina	 = "paris";
    	String flightno 	= " ch102";
    	int    noofcargo	= 4;
    	char   cargoclass	= 'd';
    			
    
    //PROBLEM 2
    //SubClient clientobjecttest = new SubClient(fsname,lsname,tphone,adss);	
    	
    PROBLEM 3
    SubClient clientobjecttest = new SubClient();	
    	
    	
    
    
    	}

  2. #2
    Join Date
    Jan 2004
    Posts
    8
    I have prepared the following code that sorts out your problem. For a good series of tutorials on OOP with Java go to http://www.developer.com/java/article.php/935351

    This has a full series of tutorials written by **** baldwin
    The full series is also available at www.dickbaldwin.com

    Here is the code I sorted out for you

    class Person
    {
    String firstName;
    String lastName;
    String address;
    int telephoneNumber;

    Person(String fsname,String lsname,int tphone,String adss)
    {
    firstName = fsname;
    lastName = lsname;
    telephoneNumber = tphone;
    address = adss;
    }
    }





    class SubClient extends Person
    {
    //creating a constructor to get variables ,because i dont seem to be able to the the class to exten as well as
    //take parameters.

    SubClient(String fsname,String lsname,int tphone,String adss)
    {
    super(fsname,lsname,tphone,adss); // PROBLEM 1
    String testvalue = "test";
    System.out.println(testvalue);
    // the line above is only for test
    }

    void printClientDetails()
    {
    System.out.println (firstName);
    System.out.println (lastName);
    System.out.println (telephoneNumber);
    System.out.println (address);
    }
    }




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

    // these variables for testing
    String first = "Ashley";
    String last = "Hulme";
    int tel = 12345678;
    String adds = "England";


    //PROBLEM 2
    SubClient clientObjectTest = new SubClient(first,last,tel,adds);
    clientObjectTest.printClientDetails();

    //PROBLEM 3
    //SubClient clientobjecttest = new SubClient();
    //To use the default constructor you would have to insert setter methods into the sub class
    }
    }


    hope this helps

    Ash
    ashley.hu1me@virgin.net
    dont hesitate to contact me if you have any more problems
    Attached Files Attached Files

  3. #3
    Join Date
    Jan 2004
    Posts
    10

    Thankyou

    Your reply has been a great deal of help thankyou

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