What wrong with it?case : public static void main

[bytescode]

Hi all,

Please help me.

This is about inheretance in Java SE, at Ubuntu 9.04 using Eclipse.

My script like this (file : Toko.java)

//kelas TokoBuku
class TokoBuku {
    int IDToko;
    String NamaToko;
    String AlamatToko;

    //konstructor
    public TokoBuku(int ID,String Nama,String Alamat) {
    IDToko=ID;
    NamaToko = Nama;
    AlamatToko = Alamat;
}

//methode tampilkan    
public void DisplayDetails () {
	System.out.println("ID 			 = " + IDToko);
	System.out.println("Nama Toko 	 = " + NamaToko);
	System.out.println("Alamat            = " + AlamatToko);
}    

//kelas Buku
class Buku {
	int IDBuku;
	String JudulBuku;
	float HargaBuku;

	//konstructor
	public Buku (int ID, String judul, float harga) {
		IDBuku = ID;
		JudulBuku = judul;
		HargaBuku = harga;
	}

	//methode tampilkan
	public void DisplayDetails () {
	    System.out.println("ID 		  = " + IDBuku);
	    System.out.println("Judul Buku     = " + JudulBuku);
	    System.out.println("Harga Buku    = " + HargaBuku);
	}

}

//Kelas Komik 
//diturunkan dari kelas Buku
class Komik extends Buku {
    String KategoriKomik;
    String JudulKomik;

    //konstruktor
    public Komik (int bID, String judul, float harga, String kategorikomik, String judulkomik) {
    super(bID, judul, harga);
    KategoriKomik = kategorikomik;
    JudulKomik = judulkomik;
}

    //methode tampilkan
    public void DisplayDetails () {
    	super.DisplayDetails();
    	System.out.println("Kategori 	= " + KategoriKomik);
    	System.out.println("Judul  	= " + JudulKomik);
}    
}

//kelas utama
//ada main
public class Toko {
	public static void main(String[] args) {
		Komik komik = new Komik(111, "Shinchan", 20000, "anime", "anak - anak");
		Buku buku = new Buku(222, "Ramayana", 25000);
		TokoBuku tokobuku = new TokoBuku(333, "Buku Bacaan", "Jl Asoka 12 Denpasar");
		komik.DisplayDetails();
		buku.DisplayDetails();
		tokobuku.DisplayDetails();
	}
}
}

When I compile and run it, Eclipse show error message like this :
The methode main cannot be declared static, static methode can be declared in a static or top level type

But when I remove static, it can't run too.

So what wrong with this? Please help me. Thanks.

[Junky]

It seems you have the Toku class inside the TokuBuku class. Is this what you want? To make your code and life easier you should put each class in its own file. Unless it really is an inner class.

[bytescode]

Maybe like that. But in this case I try to make a simple code using Java to implement inheretance. Toko mean store in Indonesian language.

OK I will try your suggest :)

Thanks bro.

[bytescode]

Done :D

I create package named anak inside project, and move class TokoBuku inside it. Now it run well :)

Thanks for your help :D

[castiel]

Here, i fixed it up for you, read my comments

//kelas TokoBuku
class TokoBuku {
	int IDToko;
	String NamaToko;
	String AlamatToko;

	//konstructor
	public TokoBuku(int ID,String Nama,String Alamat) {
		IDToko=ID;
		NamaToko = Nama;
		AlamatToko = Alamat;
	}

	//methode tampilkan    
	public void DisplayDetails () {
		System.out.println("ID 			 = " + IDToko);
		System.out.println("Nama Toko 	 = " + NamaToko);
		System.out.println("Alamat            = " + AlamatToko);
	}    

	//kelas Buku
	class Buku {
		int IDBuku;
		String JudulBuku;
		float HargaBuku;

		//konstructor
		public Buku (int ID, String judul, float harga) {
			IDBuku = ID;
			JudulBuku = judul;
			HargaBuku = harga;
		}

		//methode tampilkan
		public void DisplayDetails () {
			System.out.println("ID 		  = " + IDBuku);
			System.out.println("Judul Buku     = " + JudulBuku);
			System.out.println("Harga Buku    = " + HargaBuku);
		}

	}

	//Kelas Komik 
	//diturunkan dari kelas Buku
	class Komik extends Buku {
		String KategoriKomik;
		String JudulKomik;

		//konstruktor
		public Komik (int bID, String judul, float harga, String kategorikomik, String judulkomik) {
			super(bID, judul, harga);
			KategoriKomik = kategorikomik;
			JudulKomik = judulkomik;
		}

		//methode tampilkan
		public void DisplayDetails () {
			super.DisplayDetails();
			System.out.println("Kategori 	= " + KategoriKomik);
			System.out.println("Judul  	= " + JudulKomik);
		}    
	}

	//kelas utama
	//ada main
	//public class Toko {     //I got rid of this because you can't have inner classes with static methods
		public static void main(String[] args) {
			
			//As you have created inner classes insdie TokoBuku
			//you must first create a TokoBuko object before you can 
			//create the inner class objects
			TokoBuku tok = new TokoBuku(3, "john", "smith");
				
			Komik komik = tok.new Komik(111, "Shinchan", 20000, "anime", "anak - anak");
			Buku buku = tok.new Buku(222, "Ramayana", 25000);
			TokoBuku tokobuku = new TokoBuku(333, "Buku Bacaan", "Jl Asoka 12 Denpasar");
			komik.DisplayDetails();
			buku.DisplayDetails();
			tokobuku.DisplayDetails();
		}
//	}
}

[Junky]

I got rid of this because you can't have inner classes with static methods

Unless the class is declared as static as well.

[bytescode]

Right :D

Thanks for your help :D

[bytescode]

This my fix code :D

File : Toko.java

//kelas TokoBuku
class TokoBuku {
    int IDToko;
    String NamaToko;
    String AlamatToko;

    //konstructor
    public TokoBuku(int ID,String Nama,String Alamat) {
    IDToko=ID;
    NamaToko = Nama;
    AlamatToko = Alamat;
}

//methode tampilkan    
public void DisplayDetails () {
	System.out.println("ID 			 	= " + IDToko);
	System.out.println("Nama Toko 	 	= " + NamaToko);
	System.out.println("Alamat       	        = " + AlamatToko);
}   
}


//kelas Buku
class Buku {
	int IDBuku;
	String JudulBuku;
	float HargaBuku;

	//konstructor
	public Buku (int ID, String judul, float harga) {
		IDBuku = ID;
		JudulBuku = judul;
		HargaBuku = harga;
	}

	//methode tampilkan
	public void DisplayDetails () {
	    System.out.println("ID 		  	= " + IDBuku);
	    System.out.println("Judul Buku     	= " + JudulBuku);
	    System.out.println("Harga Buku    	= " + HargaBuku);
	}

}

//Kelas Komik 
//diturunkan dari kelas Buku
class Komik extends Buku {
    String KategoriKomik;
    String JudulKomik;

    //konstruktor
    public Komik (int bID, String judul, float harga, String kategorikomik, String judulkomik) {
    super(bID, judul, harga);
    KategoriKomik = kategorikomik;
    JudulKomik = judulkomik;
}

    //methode tampilkan
    public void DisplayDetails () {
    	super.DisplayDetails();
    	System.out.println("Kategori   = " + KategoriKomik);
    	System.out.println("Judul  	 = " + JudulKomik);
}    
}

//kelas utama
//ada main
public class TokoBuku {
	public static void main(String[] args) {
		Komik komik = new Komik(111, "Shinchan", 20000, "anime", "anak - anak");
		Buku buku = new Buku(222, "Ramayana", 25000);
		TokoBuku tokobuku = new TokoBuku(333, "Buku Bacaan", "Jl Asoka 12 Denpasar");
		komik.DisplayDetails();
		buku.DisplayDetails();
		toko.DisplayDetails();
	}
}

And this is it output :

ID = 111
Judul Buku = Shinchan
Harga Buku = 20000.0
Kategori = anime
Judul = anak - anak
ID = 222
Judul Buku = Ramayana
Harga Buku = 25000.0
ID = 333
Nama Toko = Buku Bacaan
Alamat = Jl Asoka 12 Denpasar