for (int i = 0; i < adj2.length; i++) {
for (int j = 0; j < adj2.length; j++) {
path += adj[i][j]*adj[j][i];
}
}


The above always returns 0. If you run the code by hand you will see...

You haven't described what is your problem and what have you done so far. Don't expect us to read the entire code and see what works and what doesn't.
Also you are mixing everything up.

Forget...

Use a for loop, to loop through the ArrayList and print its elements instead of the System.out.println(row1)

I ran this:

Music [] array = new Music[3]; // array is an array and it is not null

// Its elements are so you need to initalize them
array[0] = new RockSong();
...

After taking a closer look at the code you don't need the casting. Since you read from the file a Music object, it doesn't matter what type of music it is:


while (true) {
Music music =...

Even though from your code you have figured out on your own how to use array of objects here is a small example:

Music [] array = new Music[3]; // array is an array and it is not null

// Its...

I don't really get the above, but I have a few corrections to add.

First, don't use the toString method of the exception. Use the getMessage to print the error.

String output2 = "Incorrect...

The split returns an array. And you try to cast it to ArrayList.
From the String get the String [] array using the split method.
Then loop through the array and add its elements to an ArrayList

I think you should keep your code they way it was and return the index where the target element was found. Without increasing it by 1. In your methods you should always return indexes the way they...

You can make the method static. Like the main.

As the error says, You cannot call a non-static method inside a static method.

Check the API.

p.addActionListener(new gameinit());

The JFrame class doesn't have such method: addActionListener.
Then search the API some more to find which elements accept an ActionListener...

In order for this method to execute:

public void actionPerformed(ActionEvent e)
{
Izzy.hittable();
Izzy.movement();

if(rar == 'T')
{
System.out.print("Sky High(Grand...

Well since you found the number you know one of the occurrences of the number.
Assume this:
You are looking for '3'

And you find the position of the "Red" 3. So all the others 3s will be either...

You can check the API to see if there is a way to get the data from the table.

This thread has already been solved and you added no additional information.
Also using eclipse will not solve the problem but it will make it bigger because the user will not have learned a thing...

Because you only have ONE tempPerson object. You have the same instance of it:



tempPerson.setPerson(tempName, tempAddress, tempBirthDate);

System.out.println(tempPerson.getLastName()); //...

I don't know. Have you checked the API for Treemap?

Try run it without the .class extension:
> java Hi

Then post the error that you will get :)

You need to use java.util.Date, not java.sql.Date.

Yes, but you didn't say what the error is. The code seems fine. What is your problem?

Also you should post a few lines of the file you are reading.
Also check the API for the class: Scanner:...

I would suggest, before asking such questions, first to check the java API:
java API (http://java.sun.com/j2se/1.5.0/docs/api/overview-summary.html)
javax.swing...

You don't need the newPatron object. In the if statements you will only have one instance. You will not have an instance of the super class. Only of child classes. The way you have it in the if...

Isn't this suppose to throw an ArrayIndexOutOfBounds Exception?:

names[names.length] = ...

names's length is 1
java.lang.ArrayIndexOutOfBoundsException: 1

Inside the actionPerformed you can try this:

private void actionPerformed(ActionEvent event) {
// assuming that you have a list globally of type Patron (the super class)

if (radioButton1...

The phone[][] is null. That is why you are getting the exception.

And no this:

String phone[][] = { {"A", "B","C"},
{"D", "E", "F"},
{"G","H", "I"},
{"J", "K", "L"},
...

I didn't quite realize your problem but here are some suggestions.

You can have one class with all the info and you can have one field indicating what type it is. You can have if-statements that...

We need to see more code

I am not familiar with the classes of the javax.swing you are using but my experience tells me this:

Firstly, I assume that the method you use to add the book to the list takes as argument an...

Because this:
123456789123
is not an int, it's a long.

It is a classic mistake when you try to use a big number. If you check the API you will see how big an int can be.

What value does this...

These lines are incorrect:

GetBookDetails();
newBook = new Book (IDNum, Title,Author,Publishr,CatNumPublicationYr,returnDate,BookStat,ISBN);


with the GetBookDetails you get all the date from...

If you run this code you will see that '==' doesn't work:

public static void main(String [] args) {
String s1 = new String("aa");
String s2 = new String("aa");

...

At the validation I believe that the seconds should until 59. For the hours you 23, 59. Why not the same for seconds.

For the extract when you multiply and then do a mod, you will get 0.

123 *...

When the user logs in, do you put that user in the session?

String username;
String password;

// check the database to see if the user is valid.
if (yes) {
...

Actually I understood that the objective was to monitor how many times a word appeared.
I would suggest sth like this:

String word;
Vector linesAppeared;

And the size of the vector would be...

Vector vIf = new Vector();

....
// inside the while loop
if (line.equals("if")) {
Freq[1] = Freq[1] + 1;
vIf.add(lineCount);
}

You know very well that this is not the way to declare variables:

int firstnumber = 1,2,3,4,5,6,7,8,9,10,11,12,13;
int secondnumber = 1,2,3,4;

If you can't fix this, don't go any further.
...

The ones between the "" are strings and they will be printed they way they are. Surely you have written the Hello World program:

System.out.println("Hello World");

System.out.println("Row...

What do you mean by "X".
Maybe this:

number " + loops + " " + loops + " x " + num + " = " + result);

Be more careful!!.
You missed the postcode. Count your arguments.