How do I fix this? Java error codes

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class Book {

int stockNum;
String author;
String title;
double price;
int pages;

public int getStockNum() {
return stockNum;
}
public void setStockNum(int stockNum) {
this.stockNum = stockNum;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getPages() {
return pages;
}
public void setPages(int pages) {
this.pages = pages;
}

public Book() {
super();
}
public Book(int stockNum, String author, String title, double price, int pages) {
super();
this.stockNum = stockNum;
this.author = author;
this.title = title;
this.price = price;
this.pages = pages;
}

@Override
public String toString() {
return "Stock Number: " + stockNum + ", Author: " + author + ", Title: " + title + ", Price: " + price
+ ", Pages: " + pages;
}

}

class TextBook extends Book{
private int gradelevelbook;

public int getGradelevelbook() {
return gradelevelbook;
}

public void setGradelevelbook(int gradelevelbook) {
this.gradelevelbook = gradelevelbook;
}

public class BookApplication {

public void main(String[] args) {

Book book1 = new Book();
book1.setAuthor("Chad");
book1.setPages(390);
book1.setPrice(345);
book1.setStockNum(2);
book1.setTitle("Intro to C++");

TextBook tb1=new TextBook();

tb1.setGradelevelbook(3);
tb1.setAuthor("dennis ritchie");
tb1.setPages(566);
tb1.setPrice(200);
tb1.setStockNum(5);
tb1.setTitle("Java beginer");

System.out.println(book1.getAuthor()+" "+book1.getPages()+" "+book1.getPrice()+" "+book1.getStockNum()+" "+book1.getTitle());
System.out.println(tb1.getAuthor()+" "+tb1.getPages()+" "+tb1.getPrice()+" "+tb1.getPrice()+" "+tb1.getStockNum()+" "+tb1.getTitle()+" "+tb1.getGradelevelbook());
}

}
}

What I have tried:

Every time I run this code I get an error code saying it's missing the "Public static void main" but when I add it, it creates more error codes. What should I do?

Posted 25-Apr-20 8:41am

NikonMakeup

Updated 25-Apr-20 12:02pm

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3 solutions

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Tony Hill · Answer 1 · 2020-04-25T09:39:00

Your main problem is the fact that the braces are out of kilter.

Your class 'TextBook' is missing a closing brace which means the compiler thinks that your 'BookApplication' class is part of the 'TextBook' class.

Once you correct the brace problem you can then set the main method signature to include the static keyword which will be required for the main entrypoint (see corrected code below

Java

class TextBook extends Book {
	private int gradelevelbook;

	public int getGradelevelbook() {
		return gradelevelbook;
	}

	public void setGradelevelbook(int gradelevelbook) {
		this.gradelevelbook = gradelevelbook;
	}
}                                       // THIS BRACE WAS MISSING

public class BookApplication {

		public static void main(String[] args) {           // CORRECTED METHOD SIGNATURE TO INCLUDE STATIC

			Book book1 = new Book();
			book1.setAuthor("Chad");
			book1.setPages(390);
			book1.setPrice(345);
			book1.setStockNum(2);
			book1.setTitle("Intro to C++");

			TextBook tb1 = new TextBook();

			tb1.setGradelevelbook(3);
			tb1.setAuthor("dennis ritchie");
			tb1.setPages(566);
			tb1.setPrice(200);
			tb1.setStockNum(5);
			tb1.setTitle("Java beginer");

			System.out.println(book1.getAuthor() + " " + book1.getPages() + " " + book1.getPrice() + " "
					+ book1.getStockNum() + " " + book1.getTitle());
			System.out.println(tb1.getAuthor() + " " + tb1.getPages() + " " + tb1.getPrice() + " " + tb1.getPrice()
					+ " " + tb1.getStockNum() + " " + tb1.getTitle() + " " + tb1.getGradelevelbook());
		}
	}
                // REMOVED EXCESS BRACE FROM HERE

OriginalGriff · Answer 2 · 2020-04-25T08:51:00

It means you forgot a keyword:

Java

public class BookApplication {

public void main(String[] args) {

Book book1 = new Book();

Try this:

Java

public class BookApplication {

public static void main(String[] args) {

Book book1 = new Book();

Your app needs one - and only one - main method, and it must be declared as static so that it is not associated with any specific instance of a class.
Then it becomes the "first method" that is executed in your code when the app starts.

MadMyche · Answer 3 · 2020-04-25T12:04:00

Formatting code may be purely aesthetic, but it makes it a lot easier to read and find things like misplaced and/or missing closing brackets.
Besides some simple indents, a couple of comments I added to your code should show you where your problem lies

Java

class Book {
   int stockNum;
   String author;
   String title;
   double price;
   int pages;

   public int getStockNum() { return stockNum; }
   public void setStockNum(int stockNum) { this.stockNum = stockNum; }

   public String getAuthor() { return author; }
   public void setAuthor(String author) { this.author = author; }

   public String getTitle() { return title; }
   public void setTitle(String title) { this.title = title; }

   public double getPrice() { return price; }
   public void setPrice(double price) { this.price = price; }

   public int getPages() { return pages; }
   public void setPages(int pages) { this.pages = pages; }

   public Book() { super(); }

   public Book(int stockNum, String author, String title, double price, int pages) {
      super();
      this.stockNum = stockNum;
      this.author = author;
      this.title = title;
      this.price = price;
      this.pages = pages;
   }

   @Override public String toString() {
      return "Stock Number: " + stockNum + ", Author: " + author + ", Title: " + title + ", Price: " + price + ", Pages: " + pages;
   }
}


class TextBook extends Book{
   private int gradelevelbook;

   public int getGradelevelbook() { return gradelevelbook; }
   public void setGradelevelbook(int gradelevelbook) { this.gradelevelbook = gradelevelbook; }

// missing closing brace here.... 
  // results in this being part of Textbook class
   public class BookApplication {
      public void main(String[] args) {
         Book book1 = new Book();
         book1.setAuthor("Chad");
         book1.setPages(390);
         book1.setPrice(345);
         book1.setStockNum(2);
         book1.setTitle("Intro to C++");

         TextBook tb1=new TextBook();
         tb1.setGradelevelbook(3);
         tb1.setAuthor("dennis ritchie");
         tb1.setPages(566);
         tb1.setPrice(200);
         tb1.setStockNum(5);
         tb1.setTitle("Java beginer");

         System.out.println(book1.getAuthor()+" "+book1.getPages()+" "+book1.getPrice()+" "+book1.getStockNum()+" "+book1.getTitle());
         System.out.println(tb1.getAuthor()+" "+tb1.getPages()+" "+tb1.getPrice()+" "+tb1.getPrice()+" "+tb1.getStockNum()+" "+tb1.getTitle()+" "+tb1.getGradelevelbook());
      }
   }

} // extra brace here

How do I fix this? Java error codes

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