Question

Java programmers!!!!

Complete the definition of the Tavunu class according to the specifications below and the JUnit4 test file given

Background

A tavunu is an imaginary Earth-dwelling being that looks a bit like a Patagonian Mara and lives in a non-gendered but hierarchical society. Most interactions among tavunu are negotiated with pava --- items of status used for bargaining. Pava is always traded whole; you can't trade half a pava.

public class Tavunu {

// See what to do

}

what to do

Develop some code

Complete the definition of the Tavunu class so it represents tavuni (that's plural for tavunu) according to the specifications below and the JUnit4 test file here( see below).

A Tavunu instance should have a name of the tuvunu, the amount of pava the tavunu holds, and their year of birth.

A Tavunu instance should also have the following methods:

• setName(name): gives the tavunu a new name. All tavunu names begin with the letters 'T' or 'D'. If the desired new name does not meet this criterion, the method does not change the name and returns false. Otherwise it changes the tavunu's name and returns true.
• getName(): returns the tavunu's name.
• spendPava(amount): decreases the amount of pava held by the tavunu. If the amount is zero or less the method does not change the pava and returns false. Otherwise it subtracts the amount from the tavunu's pava and returns true.
• receivePava(amount): increases the amount of pava held by the tavunu. If the amount is zero or less it does not change the pava and it returns false. Otherwise it adds the amount to the tavunu's pava and returns true.
• getPava(): returns the amount of pava held by this tavunu.
• Accessor and mutator for the year of their birth. Negative values are OK --- they correspond to BCE dates.
• An appropriate toString() method.
• No-argument (default) and parameterized constructors.

import org.junit.Test;
import static org.junit.Assert.*;

/**
 * Tests the Tavunu class w/ JUnit 4.
 *
 */
public class TavunuTest {

    /**
     * Also tests accessors.
     */
    @Test
    public void testCtorNoArg() {
        var tv = new Tavunu();
        assertEquals(tv.getName(), "");
        assertEquals(tv.getPava(), 0);
        assertEquals(tv.getBirthYear(), Integer.MIN_VALUE);
    }

    /**
     * Also tests accessors.
     */
    @Test
    public void testCtorParams() {
        var tv = new Tavunu("Dease", 1944, 42);
        assertEquals(tv.getName(), "Dease");
        assertEquals(tv.getPava(), 42);
        assertEquals(tv.getBirthYear(), 1944);
    }

    @Test
    public void testToString() {
        var tv = new Tavunu("Dease", 1944, 42);
        
        assertEquals("" + tv, "Dease born in 1944 has 42 pava.");
    }
    
    @Test
    public void testSetName() {
        var tv = new Tavunu();

        tv.setName("");
        assertEquals(tv.getName(), "");

        tv.setName("T");
        assertEquals(tv.getName(), "T");

        tv.setName("D");
        assertEquals(tv.getName(), "D");

        tv.setName("Trelling");
        assertEquals(tv.getName(), "Trelling");

        tv.setName("Dint");
        assertEquals(tv.getName(), "Dint");

        tv.setName("tranque");
        assertEquals(tv.getName(), "Dint");

        tv.setName("demary");
        assertEquals(tv.getName(), "Dint");

        tv.setName("Hint");
        assertEquals(tv.getName(), "Dint");
    }

    @Test
    public void testSetYear() {
        var tv = new Tavunu("Dease", 1944, 42);

        tv.setBirthYear(-2001);
        assertEquals(tv.getBirthYear(), -2001);

        tv.setBirthYear(0);
        assertEquals(tv.getBirthYear(), 0);

        tv.setBirthYear(2001);
        assertEquals(tv.getBirthYear(), 2001);
    }

    @Test
    public void testReceivePava() {
        var tv = new Tavunu("Dease", 1944, 42);

        boolean rv = tv.receivePava(-2001);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, false);

        rv = tv.receivePava(-1);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, false);

        rv = tv.receivePava(0);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, true);

        rv = tv.receivePava(1);
        assertEquals(tv.getPava(), 43);
        assertEquals(rv, true);

        rv = tv.receivePava(10);
        assertEquals(tv.getPava(), 53);
        assertEquals(rv, true);
    }

    @Test
    public void testSpendPava() {
        var tv = new Tavunu("Dease", 1944, 42);

        boolean rv = tv.spendPava(-2001);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, false);

        rv = tv.spendPava(-1);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, false);

        rv = tv.spendPava(0);
        assertEquals(tv.getPava(), 42);
        assertEquals(rv, true);

        rv = tv.spendPava(1);
        assertEquals(tv.getPava(), 41);
        assertEquals(rv, true);

        rv = tv.spendPava(10);
        assertEquals(tv.getPava(), 31);
        assertEquals(rv, true);
    }

}

Answer 1

Code

public class Tavunu {
   private String name;
   private int birthYear;
   private int pava;
  
   public Tavunu() {
       name="";
       birthYear=Integer.MIN_VALUE;
       pava=0;
   }

   /**
   * @param name
   * @param birthYear
   * @param pava
   */
   public Tavunu(String name, int birthYear, int pava) {
       super();
       this.name = name;
       this.birthYear = birthYear;
       this.pava = pava;
   }

   /**
   * @return the name
   */
   public String getName() {
       return name;
   }

   /**
   * @return the pava
   */
   public int getPava() {
       return pava;
   }

   /**
   * @param int the pava to spend
   */
   public boolean spendPava(int pava) {
       if(pava>=0 && pava<=this.pava)
       {
           this.pava-=pava;
           return true;
       }
       return false;
   }
   /**
   * @param int the amount to add
   */
   public boolean receivePava(int amount)
   {
       if(pava>=0 && pava<=this.pava)
       {
           this.pava+=pava;
           return true;
       }
       return false;
   }

   /**
   * @param string the name to set
   */
   public boolean setName(String name) {
       if(name.charAt(0)=='T' || name.charAt(0)=='D')
       {
           this.name = name;
           return true;
       }
       return false;
   }

   /**
   * @return the birthYear
   */
   public int getBirthYear() {
       return birthYear;
   }

   /**
   * @param birthYear the birthYear to set
   */
   public void setBirthYear(int birthYear) {
       this.birthYear=birthYear;
   }
  
  
  
}
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