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my computer glitched and all my work got deleted so i had to redo other assigned problems. will be back as soon as i catch back up

Enter student id:1234
Enter course id: 1 for Math, 2 for English1
Students registered for Math:
null
Exception in thread "main" java.lang.NullPointerException
at...

if (courseName.equals("Math"))

i seriously dont see it . im so lost.

now it shows:
Enter student id:1234
Enter course id: 1 for Math, 2 for English2
Students registered for Math:
Exception in thread "main" java.lang.NullPointerException
at...

i am trying to insert 5 students ids and a
course number for each student id. Then it prints all
5 student ids and the course name associated with
each student id.

but im having trouble...

i have errors in the "if" and both "else if"
the compiler says "cannot convert from String to boolean and
int to String

instructions:

1. Add two private instance variables,
String...

this is my first programming course please take that into consideration please :)

instructions:

1. Add two private instance variables,
String courseName and char grade to this class.

2....

thanks! totally works!!

it gives me a ton of error messages:
Exception in thread "AWT-EventQueue-1" java.lang.Error: Unresolved compilation problems:
The constructor Circle(int, int, int, Color) is undefined
The...

this may seem like a stupid question but r they all supposed to be in one class or three different ones in one workspace?

thanks!

so im a new programmer and im bsing my way through my first online course. im not asking for answers but please take that into consideration when explaining please.

im supposed to make a bouncing...

package assignment7;

import java.awt.*;

public class Exercise5
{
public void paint(Graphics g)
{
g.drawRect(30, 50, 50, 50);
g.drawLine(30,50,40,40);

lines 7, 8, &12 "primes" are underline in red (prime cannot be resolved) is what pops up when i hover over the x's.
i don't get why that is.



package assignment7;

public class Exercise3
{...

so how do i save to the file? cause the current code already askes the user for age and prints it out?

i don't understand what you mean by that. sorry i am kind of new at this.

i am supposed to Write a program that prints a shape similar to the following shape. Maximize use of loops and minimize use of print statements.
.....*
....**
...***
..****
...***
....**...

I have attempted a new code and got a little further.
I do still have to figure out how to save to the created file.



package assignment7;

import java.io.*;
import java.util.*;
public...

1. creates a file.
2. ask user to write into that file
3. save the file
4. print content of file.

is my current exercise
so far i have gotten the code to create a file

what should i use to...

yes it does, and to print out the random number if the player loses would be the code below:


if(hasWon)
{
System.out.println("You win");
System.exit(0);
}
}...

sorry. im changing it again now i think this will be good



package assignment7;

import java.util.Scanner;
import java.util.Random;

public class Exercise1

to be honest i'm not sure what im doing but i think im missing something
here is the revised version
2759

what happens when i try to compile & run

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Duplicate local variable randomNumber
randomGenerator cannot be resolved...

hi! this is my first time one a forum and learning code, so please bear with me.
I was told to write a program which generates a random number between 0 to 5 *including 5*
and give the user 3...