Foros del web, para los que viven de bits

public class test {
	public static void main(String [] args) {
		Clave key = new Clave("666","444","111");
		if(key.validarClave())
			System.out.println("Es correcto");
		else
			System.out.println("Es incorrecto");
	}
}

public class Clave {
	
	String subKey1;
	String subKey2;
	String subKey3;
	
	public Clave(String subClave1, String subClave2, String subClave3){
		subKey1 = subClave1;
		subKey2 = subClave2;
		subKey3 = subClave3;
	}
	
	public boolean validarClave(){
		if (validarSubStr1() && validarSubStr2() && validarSubStr3())
			return true;
		else
			return false;
	}
	
	private boolean validarSubStr1() {
		boolean ret = true;
		for (int i=0;i<subKey1.length();i++)
			if(Integer.parseInt(subKey1.substring(i,i+1))<=5)
				ret = false;
		if(subKey1.length()== 3 && ret)
			return true;
		else
			return false;
	}

	private boolean validarSubStr2() {
		boolean ret = true;
		for (int i=0;i<subKey2.length();i++)
			if(Integer.parseInt(subKey2.substring(i,i+1))>=5)
				ret = false;
		if(subKey2.length()== 3 && ret)
			return true;
		else
			return false;
	}

	private boolean validarSubStr3() {
		boolean ret = true;
		for(int i=0;i<subKey3.length()-1;i++)
			if(subKey3.toCharArray()[i]!=subKey3.toCharArray()[i+1])
				ret = false;
		if(subKey3.length()== 3 && ret)
			return true;
		else
			return false;
	}
	
}

import java.util.StringTokenizer;
import java.util.regex.Pattern;

public class Clave {

	public static boolean validarClave(String clave) {
		if (!((Pattern.compile("[0-9]{3}-[0-9]{3}-[0-9]{3}")).matcher(clave))
				.matches())
			return false;

		StringTokenizer tokens = new StringTokenizer(clave, "-");

		String trio = tokens.nextToken();
		for (int i = 0; i < 3; i++)
			if (Integer.parseInt(new Character(trio.charAt(i)).toString()) < 5)
				return false;
		trio = tokens.nextToken();
		for (int i = 0; i < 3; i++)
			if (Integer.parseInt(new Character(trio.charAt(i)).toString()) >= 5)
				return false;
		trio = tokens.nextToken();
		char primervalor = trio.charAt(0);
		for (int i = 1; i < 3; i++)
			if (trio.charAt(i) != primervalor)
				return false;
		return true;
	}

	public static void main(String[] args) {
		System.out.println(Clave.validarClave("585-123-777"));
	}
        // esto retorna true si está bien escrita, según tus requerimientos,
        // y false si está mal escrita.
}

public boolean validarClave(String clave) 
{
    return ((java.util.regex.Pattern.compile("[5-9]{3}-[0-5]{3}-([0-9])\\1\\1")).matcher(clave)).matches();
}