[Ch3] Code exercises from the end of the book (mostly the questions, not the answers)

package ch3;

class Books {

  String title;

  String author;

}

class BooksTestDrive {

  public static void main(String[] args) {

    Books[] myBooks = new Books[3];

    int x = 0;

    myBooks[0].title = "The Grapes of Java";

    myBooks[1].title = "The Java Gatsby";

    myBooks[2].title = "The Java Cookbook";

    myBooks[0].author = "bob";

    myBooks[1].author = "sue";

    myBooks[2].author = "ian";

    while (x < 3) {

      System.out.print(myBooks[x].title);

      System.out.print(" by ");

      System.out.println(myBooks[x].author);

      x = x + 1;

    }

  }

}

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package ch3;

public class FiveMinuteMystery {

  void solution1() {

    int x = 0;

    Contact[] contacts = new Contact[10];

    while (x < 10) {   // make 10 contact objects

      contacts[x] = new Contact();

      x = x + 1;

    }

    // do complicated Contact list updating with contacts

  }

  void solution2() {

    int x = 0;

    Contact contactRef;

    while ( x < 10 ) {   // make 10 contact objects

      contactRef = new Contact();

      x = x + 1;

    }

    // do complicated Contact list updating stuff with contactRef

  }

}

class Contact {

}

package ch3;

class HeapQuiz {

  int id = 0;

  public static void main(String[] args) {

    int x = 0;

    HeapQuiz[] hq = new HeapQuiz[5];

    while (x < 3) {

      hq[x] = new HeapQuiz();

      hq[x].id = x;

      x = x + 1;

    }

    hq[3] = hq[1];

    hq[4] = hq[1];

    hq[3] = null;

    hq[4] = hq[0];

    hq[0] = hq[3];

    hq[3] = hq[2];

    hq[2] = hq[0];

    // do stuff

  }

}  

package ch3;

class Hobbits {

  String name;

  public static void main(String[] args) {

    Hobbits[] h = new Hobbits[3];

    int z = 0;

    while (z < 4) {

      z = z + 1;

      h[z] = new Hobbits();

      h[z].name = "bilbo";

      if (z == 1) {

        h[z].name = "frodo";

      }

      if (z == 2) {

        h[z].name = "sam";

      }

      System.out.print(h[z].name + " is a ");

      System.out.println("good Hobbit name");

    }

  }

}

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package ch3;

class TestArrays {

  public static void main(String[] args) {

    int[] index = new int[4];

    index[0] = 1;

    index[1] = 3;

    index[2] = 0;

    index[3] = 2;

    String[] islands = new String[4];

    islands[0] = "Bermuda";

    islands[1] = "Fiji";

    islands[2] = "Azores";

    islands[3] = "Cozumel";

    int y = 0;

    int ref;

    while (y < 4) {

      ref = index[y];

      System.out.print("island = ");

      System.out.println(islands[ref]);

      y = y + 1;

    }

  }

} 

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