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Checker

/**
 * This is based on Question 4 of the 2008 APCS A exam.
 * 
 * @author Chris Thiel, OFMCap 
 * @version 8 May 2008
 */

public interface Checker
{
	/**
	 * @param  text	a string to consider for acceptance
	 * @return true if this Checker accepts text, false otherwise
	 */
	boolean accept(String text);
}

CheckerDriver

/**
 * Tests out your implementations
 * @author Chris Thiel
 * @version 8 May 2008
 */
public class CheckerDriver
{

    public static void main(String[] args)
    {
        Checker broccoliChecker= new SubstringChecker("broccoli");

        System.out.println("Part (a) Test:");
        System.out.println("broccoliChecker.accept(\"broccoli\"):"+broccoliChecker.accept("broccoli"));
        System.out.println("broccoliChecker.accept(\"I like broccoli\"):"+broccoliChecker.accept("I like broccoli"));
        System.out.println("broccoliChecker.accept(\"carrots are great\"):"+broccoliChecker.accept("carrots are great"));
        System.out.println("broccoliChecker.accept(\"Broccoli Bonanza\"):"+broccoliChecker.accept("Broccoli Bonanza"));

        System.out.println("Part (b) Test:");
        Checker bChecker = new SubstringChecker("beets");
        Checker cChecker = new SubstringChecker("carrots");
        Checker bothChecker = new AndChecker(bChecker, cChecker);
        Checker aChecker = new SubstringChecker("artichokes");
        Checker veggies = new AndChecker(bothChecker, aChecker);



        System.out.println("Part (c) Test:");
        Checker aChecker = new SubstringChecker("artichokes"); 
        Checker kChecker = new SubstringChecker("kale"); 
        Checker yummyChecker; 

        /* code to construct for part (c) */

        System.out.println("yummyChecker.accept(\"chocolate truffles\")"+yummyChecker.accept("chocolate truffles"));
        System.out.println("yummyChecker.accept(\"kale is great\")"+yummyChecker.accept("kale is great"));
        System.out.println("yummyChecker.accept(\"Yuck: artichokes & kale\")"+yummyChecker.accept("Yuck: artichokes & kale"));



    }
}

SubstringChecker (part a)

public class SubstringChecker impliments Checker
{
  String word;
  public SubstringChecker(String text)
  {
    word=text;
  }
  public boolean accept(String text)
  {
    boolean c= true;
    if(text.indexOf(word)=-1)
      boolean c= false;
    return c;
  }
}

or

  	public boolean accept(String text)
	{
		int location=text.indexOf(checkString);
		if (location==-1) 
		   return false;
		else return true;
	}

AndChecker (part b)

public class AndChecker implements Checker
{
	private Checker a;
	private Checker b;
	public AndChecker(Checker one, Checker two)
	{
		a=one;
		b=two;
	}


	public boolean accept(String text)
	{

		if (a.accept(text) && b.accept(text)) 
		   return true;
		else return false;
	}
}

NotChecker

public class NotChecker implements Checker
{
	private Checker a;

	public NotChecker(Checker one)
	{
		a=one;

	}

	/*
	 * returns true if and only if its Checker object 
	 * does NOT accept the  string 
	 */
	public boolean accept(String text)
	{
		return !a.accept(text);
	}
}

Solution for part (c)

yummyChecker = new AndChecker(new NotChecker(aChecker),  
                              new NotChecker(kChecker));