package javareview;

import java.util.ArrayList;

/**
 *
 * @author Mayelin
 */
public class JavaReview3
{
    public static void main(String[] args)
    {
        /****************************/
        /*         Chapter 8        */
        /****************************/
        
        // declare an array of int values
        int[] array1;

	array1 = new int[4];
        
	// initialize the elements
	array1[0] = 100;
	array1[1] = 200;
	array1[2] = 300;
	array1[3] = 400;

        
        // create a second array using an initialization list
        int[] array2 = {3, 5, 1, 9};
        
	// access the elements in array_1
	System.out.println("Element at index 0: " + array1[0]);
	System.out.println("Element at index 1: " + array1[1]);
	System.out.println("Element at index 2: " + array1[2]);
	System.out.println("Element at index 3: " + array1[3]);

       
        // Example of two variables referencing the same array
        array2 = array1;

        // Change one of the elements using array1.
        array1[0] = 200;

        // Change one of the elements using array2.
        array2[3] = 1000;

        // Display all the elements using array1
        System.out.println("The contents of array1:");
        for (int value : array1)
            System.out.print(value + " ");
        
        
        System.out.println();

        // Display all the elements using array2
        System.out.println("The contents of array2:");
        for (int value : array2)
            System.out.print(value + " ");
        
        System.out.println();
        
        // create a copy of array1 - Could also use the System.arraycopy method
        array2 = createCopyOfArray( array1 );
       
        
        // make changes to array2
        array2[0] = 8;
        array2[2] = 7;
        
        // Display all the elements in array1
        System.out.println("The contents of array1:");
        for (int value : array1)
            System.out.print(value + " ");
        
        System.out.println();

        // Display all the elements in array2
        System.out.println("The contents of array2:");
        for (int value : array2)
            System.out.print(value + " ");
        
        System.out.println();
        
        System.out.println("The total of the values stored in array1 is: " + getTotalValue(array1) + "\n");
           
        System.out.println("The highest value stored in array2 is: " + getHighestValue(array2) + "\n");
        

        testArrayOfStudents();
        
        testTwoDimensionalArray();
        
        
        int[][] numbers = { { 1,  2,  3,  4 },
                            { 5,  6,  7,  8 },
                            { 9, 10, 11, 12} };
        rowSumOf2DArray( numbers );
        
        
        testArrayLists();
       
    }
    
    
    /**
      The createCopyOfArray method creates a copy of the array that is passed as an argument.
      @param array The array to be copied.
      @return The new array.
    */
    public static int[] createCopyOfArray(int[] array)
    {
        int[] newArray = new int[array.length];
        
        for( int i = 0; i < array.length; i++)
            newArray[i] = array[i];
        
        return newArray;
    }
    
    
    /**
      The getTotalValue method returns the sum of all values stored in the given array.
      @param array The array 
      @return The sum of all values stored in the array that is passed as an argument.
    */
    public static double getTotalValue(int[] array)
    {
        double total = 0.0;     // Accumulator

        // Accumulate the sum of the elements in the array.
        for (int index = 0; index < array.length; index++)
            total += array[index];

        // Return the total.
        return total;
    }

      
    /**
      The getHighestValue method returns the highest value stored in the given array.
      @param array The array 
      @return The highest value stored in the array that is passed as an argument.
    */
    public static int getHighestValue(int[] array)
    {
        int highest = array[0];

        for (int index = 1; index < array.length; index++)
        {
            if (array[index] > highest)
                highest = array[index];
        }

        return highest;
    }

   
    /**
      The testArrayOfStudents method creates an array of Student objects and iterates through the elements.
    */
    public static void testArrayOfStudents()
    {
        // Array of Student objects
	Student[] studentList = { new Student("Michael"), new Student("Mary"), new Student("John") };
                
	System.out.println("\n*****************************************");
       
	for (int i = 0; i < studentList.length; i++) 
        {
            System.out.println("Student # " + (i + 1));
            System.out.println("Name: " + studentList[i].getName());
            System.out.println("*****************************************");
	}
    }
    
      
    /**
      The testTwoDimensionalArray method creates a 2 dimensional array. 
      It then displays some of the values.
    */
    public static void testTwoDimensionalArray()
    {
        String[][] names = {
            {"Mr. ", "Mrs. ", "Ms. "},
            {"Smith", "Jones"}
        };
        
        // Mr. Smith
        System.out.println("\n" + names[0][0] + names[1][0]);
        
        // Ms. Jones
        System.out.println(names[0][2] + names[1][1] );
    }
    
    
    /**
      The rowSumOf2DArray method displays the sum of the values stored in each inner array. 
      @param array The 2 dimensional array whose inner arrays are to be added up. 
    */
    public static void rowSumOf2DArray(int[][] array)
    {
        int rowTotal;
        for( int i=0; i < array.length; i++ )
        {
            rowTotal = 0;
            for( int j=0; j < array[i].length; j++ )
                rowTotal += array[i][j];
            
            System.out.println("Total of row " + i + " is " + rowTotal );
        }
    
    }
    
    
    /**
      The testArrayLists method creates ArrayList objects and calls some of their methods. 
    */
    public static void testArrayLists() 
    {
        System.out.println("\nTesting an array list of Strings");

	ArrayList<String> listOfNames = new ArrayList<>();
        System.out.println("# of elements " + listOfNames.size());
        
        listOfNames.add("John");
	listOfNames.add(0, "Mary");
	listOfNames.set(1, "Juan");
	listOfNames.add("Peter");
        System.out.println("# of elements " + listOfNames.size());
	listOfNames.remove(1);
       

        System.out.println(listOfNames);
        

        for( String element : listOfNames)
            System.out.println(element);
        
        
	for (int i = 0; i < listOfNames.size(); i++) 
        {
            System.out.println("Element at position " + i + " is: " + listOfNames.get(i));
        }

        
        System.out.println("\nTesting an array list of Integers");
        
        // create an ArrayList of Integers
        ArrayList<Integer> listOfNumbers = new ArrayList<>();
        System.out.println( "The size of the array list before adding elements is "
                            + listOfNumbers.size() + ".");

        Integer element1 = new Integer(23);     
        Integer element2 = 20;                  // java automatically converts an int into an
						// Integer (autoboxing)

        listOfNumbers.add(element1);
        listOfNumbers.add(element2);
        listOfNumbers.add(24);      // autoboxing is happening here as well
        listOfNumbers.add(21);
 
        
        System.out.println(listOfNumbers);

        // look for the element that has the value of age
        Integer age = 24;
    
        boolean foundFlag = false;
        int i = 0;
        while( i < listOfNumbers.size() && !foundFlag) 
        {
            if (listOfNumbers.get(i).compareTo(age) == 0) 
            {
                System.out.println("The value " + age + " was found at position " + i + ".");
		foundFlag = true;
            }
            i++;
	}
        
	if (!foundFlag)
            System.out.println("The value " + age + " was not found in the list.");
		
    }
    
}