[Java]Priblema con abstract

[Luc@s]

Ho questo cod:

import java.util.*;
/*
 *  La classe astratta di prova
 */
 abstract class ATest {
 	abstract void saluto();
 }
/*
 * L'interfaccia di prova
 */
interface IProva {
	int incr();	
}
/*
 * La classe Base che implementa IProva
 */
class Test implements IProva extends ATest {
	private String nome;
	public static int get_cont;
	public static int set_cont;
	public static int cont;

	public String getNome() {
		System.out.println("~~ GetNome Invocato: Chiamata " + get_cont +" ~~ \n");
		get_cont++;
		return nome;
	}

	public String setNome(String nm) {
		System.out.println("~~ SetNome Invocato: Chamata " + set_cont +" ~~ \n");
		this.nome = nm;
		set_cont++;
		return this.nome;
	}

	public Test() {
		System.out.println("~~ Test Invocato ~~ \n");
	}
	
	public int incr() {
		
		return cont++;
	}
	
	public void saluto() {
		System.out.println("Ciao da Test\n");
	}
}
/*
 * La classe derivate che estende Test e implementa IProva
 */
class Test2 extends Test implements IProva {
	public static int conts;
	
	public Test2() {
		System.out.println("~~ Test2 Invocato ~~ \n");
	}	
	
	public int incr() {
		
		return conts++;
	}
	
	public void saluto() {
		System.out.println("Ciao da Test2\n");
	}
} 
/*
 * La classe princ che contiene il main()
 */
class Prova {
	public static void main(String[] args) {
		Test ts = new Test();
		Test2 tt = new Test2();
		String nom = "Luca";
		String nom2 = "Erica";
		ts.setNome(nom);
		System.out.println("Il mio nome: " + ts.getNome() + "\n");
	}
	
}

Ma Mi da:

--------------------Configuration: sdk <Default>--------------------
C:\Progetti\Java\Prova.java:17: '{' expected
class Test implements IProva extends ATest {
^
C:\Progetti\Java\Prova.java:81: '}' expected
}
^
C:\Progetti\Java\Prova.java:17: Test should be declared abstract; it does not define incr() in Test
class Test implements IProva extends ATest {
^
C:\Progetti\Java\Prova.java:53: inner classes cannot have static declarations
public static int conts;
^
C:\Progetti\Java\Prova.java:74: non-static variable this cannot be referenced from a static context
Test2 tt = new Test2();
^
C:\Progetti\Java\Prova.java:77: cannot resolve symbol
symbol : method setNome (java.lang.String)
location: class Test
ts.setNome(nom);
^
C:\Progetti\Java\Prova.java:78: cannot resolve symbol
symbol : method getNome ()
location: class Test
System.out.println("Il mio nome: " + ts.getNome() + "\n");
^
C:\Progetti\Java\Prova.java:72: inner classes cannot have static declarations
public static void main(String[] args) {
^
8 errors

Process completed.

Why?