SOURCE CODE FOR ARRAYS EXAMPLE

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/**
 * Project Arrays
 * Class Main
 * 
 * Show how to create an array in three different
 * styles.
 */

public class Main
{
    public static void main(String[] args)
    {
        int i;
        
        
        // Create an array in three steps:
 
        // (1) Array declaration:
        int[] a;
        
        // (2) Space allocation for array:
        a = new int[5];
        
        // (3) Assignment of values to array elements:
        a[0] = 34;
        a[1] = 93;
        a[2] = 86;
        a[3] = 71;
        a[4] = 50;
        
        // Print contents of array a.
        for(i = 0; i < a.length; i++)
            System.out.print(a[i] + " ");
        System.out.println();

     
        // Create array in two steps:
        
        // (1) Declaration and space allocation:
        double b[] = new double[4];
        
        // (2) Assignment
        b[0] = 4.29;
        b[1] = 9.71;
        b[2] = 6.90;
        b[3] = 2.08;
       
        // Print contents of array b.
        for(i = 0; i < b.length; i++)
            System.out.print(b[i] + " ");
        System.out.println();
            
            
        // Create arrays in one step.
        
        // (1) Declare, allocate, and initialize:
        boolean c[] = {true, true, false, true};
        String d[] = {"apple", "orange", "peach", "pear"};
        
        // Print contents of arrays c and d.
        for(i = 0; i <= 3; i++)
            System.out.println(c[i] + " " + d[i]);
    }
}

// Output:
34 93 86 71 50 
4.29 9.71 6.9 2.08 
true apple
true orange
false peach
true pear

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/**
 * Project KidArray
 * Class Kid
 */
public class Kid
{
    // Private instance variables.
    private String name;
    private char gender;
    private int age;
    
    // Noarg constructor;
    public Kid()
    {
        name = "Unknown";
        gender = 'U';
        age = -1;
    }
    
    // Parameterized constructor, which 
    // performs data validation.
    public Kid(String aName, char aGender, int anAge)
    {
        // Don't allow empty string as a name.
        if (aName.equals(""))
            name = "Unknown";
        else
            name = aName;
            
        // Gender must be 'F' or 'M'.
        if (aGender == 'F' || aGender == 'M')
            gender = aGender;
        else
            gender = 'U';
            
        // Age must be nonnegative.
        if (anAge < 0)
            age = -1;
        else
            age = anAge;
    }
            
    // Accessor method for name.
    public String getName()
    {
        return name;
    }
    
    // Accessor method for gender.
    public char getGender()
    {
        return gender;
    }
    
    // Accessor method for name.
    public int getAge()
    {
        return age;
    }
    
    // Mutator method for gender.
    public void setGender(char aGender)
    {
        // Gender must be 'F' or 'M'.
        if (aGender == 'F' || aGender == 'M')
            gender = aGender;
        else
            gender = 'U';
    }
    
    // hasBirthday method adds 1 to age.
    public void hasBirthday()
    {
        age++;
    }
    
    // toString method returns object
    // information as a string.
    public String toString()
    {
        return name + " " + gender + " " + age;
    }
    
    // Two Kid objects are "equal" if their ages
    // are equal
    public boolean equals(Kid other)
    {
        return age == other.age;
        
        // If you want to declare two Kid objects
        // "equal" if their names are the same, use
        // the following return statement:
        // return name.equals(other.name);
    }
}

// Output:
Jane F 29
Tom M 31
Susan F 28
Mary F 40
Bill M 35
Karen F 34
null
null
null
null

Jane F 29
Susan F 28
Mary F 40
Karen F 34


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/**
 * Project KidArray
 * Class Kid
 */
public class Kid
{
    // Private instance variables.
    private String name;
    private char gender;
    private int age;
    
    // Noarg constructor;
    public Kid()
    {
        name = "Unknown";
        gender = 'U';
        age = -1;
    }
    
    // Parameterized constructor, which 
    // performs data validation.
    public Kid(String aName, char aGender, int anAge)
    {
        // Don't allow empty string as a name.
        if (aName.equals(""))
            name = "Unknown";
        else
            name = aName;
            
        // Gender must be 'F' or 'M'.
        if (aGender == 'F' || aGender == 'M')
            gender = aGender;
        else
            gender = 'U';
            
        // Age must be nonnegative.
        if (anAge < 0)
            age = -1;
        else
            age = anAge;
    }
            
    // Accessor method for name.
    public String getName()
    {
        return name;
    }
    
    // Accessor method for gender.
    public char getGender()
    {
        return gender;
    }
    
    // Accessor method for name.
    public int getAge()
    {
        return age;
    }
    
    // Mutator method for gender.
    public void setGender(char aGender)
    {
        // Gender must be 'F' or 'M'.
        if (aGender == 'F' || aGender == 'M')
            gender = aGender;
        else
            gender = 'U';
    }
    
    // hasBirthday method adds 1 to age.
    public void hasBirthday()
    {
        age++;
    }
    
    // toString method returns object
    // information as a string.
    public String toString()
    {
        return name + " " + gender + " " + age;
    }
    
    // Two Kid objects are "equal" if their ages
    // are equal
    public boolean equals(Kid other)
    {
        return age == other.age;
        
        // If you want to declare two Kid objects
        // "equal" if their names are the same, use
        // the following return statement:
        // return name.equals(other.name);
    }
}

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/**
 * Project IntSorting
 * Class Main
 * 
 * Sort an array of ints using the InsertionSort
 * algorithm.
 */
public class Main
{
    public static void main(String[] args)
    {
        int[] a;
        int temp;
        int i, j;

        // Allocate space for array.
        a = new int[5];

        // Initalize array.
        a[0] = 34;
        a[1] = 17;
        a[2] = 79;
        a[3] = 42;
        a[4] = 26;

        // Sort array using InsertionSort.
        for(i = 1; i <= 4; i++)
        {
            temp = a[i];
            for(j = i; j >= 1; j--)
            if (a[j - 1] >= temp)
                a[j] = a[j - 1];
            else
                break;
            a[j] = temp;
        }

        // Print sorted array.
        for(i = 0; i <= 4; i++)
            System.out.print(a[i] + " ");
    }
}

// Output:
17 26 34 42 79 

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/**
 * Project Phone
 * Class Main
 * 
 * Create arrays of names and phone numbers
 * for performing phone number lookup.
 */

import javax.swing.JOptionPane;
        
public class Main
{
    public static void main(String[] args)
    {
        String[] name, phonenum;
        int size = 13, i = 0;
        String nameToFind;
        boolean nameFound = false;
                
        // Allocate space for arrays.
        name = new String[20];
        phonenum = new String[20];
        
        // Assign values to arrays.
name[0] = "Micky Mouse";   phonenum[0] = "323/874-2383";
name[1] = "Minnie Mouse";  phonenum[1] = "323/874-2383";
name[2] = "Donald Duck";   phonenum[2] = "323/736-2938";
name[3] = "Limpy Lion";    phonenum[3] = "323/372-3728";
name[4] = "Wally Gator";   phonenum[4] = "323/763-3837";
name[5] = "Hardy Har Har"; phonenum[5] = "323/982-9883";
name[6] = "Sylvester Cat"; phonenum[6] = "323/803-8473";
name[7] = "Dewey Duck";    phonenum[7] = "323/763-9388";
name[8] = "Huey Duck";     phonenum[8] = "323/763-9388";
name[9] = "Louie Duck";    phonenum[9] = "323/763-9388";
name[10] = "Yosemite Sam"; phonenum[10] = "323/653-9387";
name[11] = "Tweety Bird";  phonenum[11] = "323/736-9278";
name[12] = "Snaggle Puss"; phonenum[12] = "323/793-3984";
            
        // Given a name, find the matching phone number.
        nameToFind = JOptionPane.showInputDialog(
            "Enter a name.");
            
        while(nameToFind != null)
        {
            nameFound = false;
            for(i = 0; i < size; i++)
                if (name[i].equals(nameToFind))
                {
                    System.out.println(
                        "Phone number for " + nameToFind + " is " +
                         phonenum[i] + ".");
                    nameFound = true;
                    break;
                }
                
            if (!nameFound)
                System.out.println(
                    "Phone number not found for " + nameToFind + ".");
                
            nameToFind = JOptionPane.showInputDialog(
                "Enter a name.");
        }
    }
}

// Input in input dialogs:
323/874-2383
323/653-9387
323/997-5000

// Output:
Phone number for Micky Mouse is 323/874-2383.
Phone number for Yosemite Sam is 323/653-9387.
Phone number not found for 323/997-5000.

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