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Thread: Help me with my code

  1. #1
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    Unhappy Help me with my code

    I'm new to java programming and this is my assignment. This is the code I've done but couldn't able to display the error message . When I execute the program I'm only getting the error message "Class room table cannot have irregular-shape table." but was not successful in getting the error message for sides and legs which should obviously be displayed."Error in setting legs . Number of legs cannot be less than 3." "Error in setting sides, number of sides cannot be 0".

    Thanks for the help.

    //Class ClassRoomTable is to model class room table
     
     
     
     
    //Class table is to model table
    class Table {
    //Error handling class.
    //An object of this class is thrown if
    //the number of legs for a table is less than 3.
    	public class TooFewLegsError extends Exception // -- 2%
    	{
    		public TooFewLegsError(){
    		System.out.println("Error in setting legs . Number of legs cannot be less than 3.");
    		}
    	}
    //An object of this class is thrown if
    //the number of sides for a table is 0
    	public class ZeroSideError extends Exception // --- 1%
    	{
    		public ZeroSideError(){
    			System.out.println("Error in setting sides, number of sides cannot be 0");
    		}
    	}
    //By default the number of legs for a table is 4, and
    //the number of sides for a table is also 4.
    	private int legs=0; // number of legs
    	private int sides=0; // number of sides
     
    //Default constructor of the table class.
    //By default the number of legs for a table is 4, and
    //the number of sides for a table is also 4.
    public Table() // --- 1%
    { 
     
     
    }
    //A TooFewLegsError is thrown if the number of legs
    //for a table is less than 3, or a ZeroSideError is thrown
    //if the number of sides for a table is equal to 0
    	public Table(int legs1, int sides1) throws TooFewLegsError, ZeroSideError
    	//---- 3%
    	{ 
    		if(legs1==2){
    		throw new TooFewLegsError();
    		}else if(sides1==0){
    		throw new ZeroSideError();
    	}
    }
    //A TooFewLegsError error is thrown if the
    //number of legs for a table is less than 3
    public void setLegs(int legs1) throws TooFewLegsError // -- 2%
    {
    if(legs1<3){
    throw new TooFewLegsError();
    }
    }
     
    //A ZeroSideError error is thrown if the number
    //of sizes for a table is equal to 0
    	public void setSides(int sides1) throws ZeroSideError // -- 2%
    	{
    	if(sides1==0){
    	throw new ZeroSideError();
    	}
    	}
     
    }
    public class ClassRoomTable extends Table 
    {
    //Error handling class.
    //An object of this class is thrown if
    //the shape of a classroom table is irregular.
    	public class IrregularShapeError extends Exception {
    		public IrregularShapeError() {
    			System.out.println("Class room table cannot have irregular-shape table.");;
     
    		}
     
    	}
    private int shape=1; // 1: rectangular
    //2: circle
    //3: triangle
    //4: irregular
    //An error is thrown if the shape is irregular
    public ClassRoomTable(int shape1) throws IrregularShapeError
    { // -- 2%
     
    if(shape1==4){
    throw new IrregularShapeError();
    }
     
    }
     
    //An error is thrown if the shape is irregular
    public void setShape(int shape1) throws IrregularShapeError
    { // -- 2%
    if(shape1==4){
    throw new IrregularShapeError();
    }
     
    }
     
    public static void main(String argv[]) {
    try {
    ClassRoomTable p = new ClassRoomTable(2);
     
    p.setShape(4);
    p.setSides(0); // This line will cause an exception
    p.setLegs(2); // This line will not be executed.
    }
    catch (ClassRoomTable.IrregularShapeError n) {
    System.out.println(
    "Class room table cannot have irregular-shape table."); 
    }
    catch (Table.TooFewLegsError n) {
    System.out.println("Error in setting legs . Number of legs cannot be less than 3.");
    }
    catch (Table.ZeroSideError n) {
    System.out.println(
    "Error in setting sides, number of sides cannot be 0"); 
    }
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Help me with my code

    Are all The error messages you are describing generated by your program?
    Can you look at the logic of the program and see why the program thinks that there are errors.
    Add println statements to the program to show the values of all the variables that are used in making the decision that there is an error. The printed output should show you where your problem is.
    If you still have questions, copy and paste here all the printed output that your program generated and add your questions to that output.

    p.setLegs(2); // This line will not be executed.

    Have you read the comment on that line of code???
    Last edited by Norm; August 4th, 2011 at 07:02 AM.