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please answer in Java..all excercises. /** * YOUR NAME GOES HERE * 4/7/2017 */ public class...

please answer in Java..all excercises.
/**
 * YOUR NAME GOES HERE
 * 4/7/2017
 */


public class Chapter9a_FillInTheCode
{
    public static void main(String[] args)
    {
        String [][] geo = {{"MD", "NY", "NJ", "MA", "CA", "MI", "OR"},
                           {"Detroit", "Newark", "Boston", "Seattle"}};


        // ------> exercise 9a1
        // this code prints the element at row at index 1 and column at index 2


        // your code goes here

        System.out.println("Done exercise 9a1.\n");


        // ------> exercise 9a2
        // this code prints all the states in the first row (the row at index 0) of array goe that start with an M.
        for (int col = 0; col < geo[0].length; col++)
        {
            // your code goes here
        }

        System.out.println("Done exercise 9a2.\n");


        // ------> exercise 9a3
        // this code prints all the cities in the second row (the row at index 1) of the array geo.
        for (int col = 0; col < geo[1].length; col++)
        {
            // your code goes here
        }


        System.out.println("Done exercise 9a3.\n");

        // ------> exercise 9a4
        // this code prints all the elements of the array geo.
        for (int row = 0; row < geo.length; row++)
        {
            // your code goes here
        }


        System.out.println("Done exercise 9a4.\n");


        int [][] a = {{9, 6, 8, 10, 5},
                      {7, 6, 8, 9, 6},
                      {4, 8, 11, 5, 6}};

        // ------> exercise 9a5
        // this code calculates and prints the sum of all the elements in the array a.
        int sum = 0;
        for (int row = 0; row < a.length; row++)
        {
            // your code goes here
        }
        System.out.println("sum of all elements in array a = " + sum);
        System.out.println("Done exercise 9a5.\n");


        // ------> exercise 9a6
        // this code calculates and prints the number of times the value 8 appears in the array a.
        int numberOfEights = 0;
        for (int row = 0; row < a.length; row++)
        {
            // your code goes here
        }
        System.out.println("# of 8s in a = " + numberOfEights);
        System.out.println("Done exercise 9a6.\n");


        // ------> exercise 9a7
        // this code calculates and prints the number of times the value 6 appears in the second row
        // (i.e., the row whose index is 1) of array a.
        int numberOfSixes = 0;
            // your code goes here

        System.out.println("# of 6s in the second row = " + numberOfSixes);
        System.out.println("Done exercise 9a7.\n");

        // ------> exercise 9a8
        // this code calculates the sum of the elements in the third column (i.e, the column with index 2) of array a.
        int columnSum = 0;
        for (int row = 0; row < a.length; row++)
        {
            // your code goes here
        }
        System.out.println("sum of elements in the third column = " + columnSum);

        System.out.println("Done exercise 9a8.\n");

        // ------> exercise 9a9
        // this code calculates the sum of the elements in the second row (i.e, the row with index 1) of array a.
        int rowSum = 0;
        for (int col = 0; col < a[1].length; col++)
        {
            // your code goes here
        }
        System.out.println("sum of elements in the second row = " + rowSum);

        System.out.println("Done exercise 9a9.\n");


        // ------> exercise 9a10
        // this code calculates and prints totals per row of array a.
        for (int row = 0; row < a.length; row++)
        {
            // your code goes here
            System.out.println("sum of elements in row " + row + " = " + rowSum);
        }


        System.out.println("Done exercise 9a10.\n");

        // ------> exercise 9a11
        // this code finds and prints the largest value of array a.
        int maxValue = Integer.MIN_VALUE;
        for (int row = 0; row < a.length; row++)
        {
            // your code goes here

        }
        System.out.println("the largest value in array a = " + maxValue);
        System.out.println("Done exercise 9a11.\n");


        // ------> exercise 9a12
        // this code finds the "smallest" row of array a (the row with the smallest sum of the elements)
        // and prints the its index, its sum, and its elements 


        System.out.println("Done exercise 9a12.");

        // ------> exercise 9a13
        // this code creates a single dimensional array of boolean with the number of elements equal to the number
        // of rows in array a. Every element of the boolean array should be set to true if the sum of the elements
        // in the corresponding row in array a is greater than 35.
        // Prints the boolean array.


        System.out.println("Done exercise 9a13.");


        // ------> exercise 9a14
        // this code sets to 0 all the elements of the even-numbered rows and sets to 1 all the elements of
        // the odd-numbered rows of array a. Prints all the elements of the updated array


        System.out.println("Done exercise 9a14.");
    }
}
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Homework Answers

Answer #1

If you have any doubts, please give me comment...

public class Chapter9a_FillInTheCode {

public static void main(String[] args) {

String[][] geo = { { "MD", "NY", "NJ", "MA", "CA", "MI", "OR" }, { "Detroit", "Newark", "Boston", "Seattle" } };

// ------> exercise 9a1

// this code prints the element at row at index 1 and column at index 2

// your code goes here

System.out.println(geo[1][2]);

System.out.println("Done exercise 9a1.\n");

// ------> exercise 9a2

// this code prints all the states in the first row (the row at index 0) of

// array goe that start with an M.

for (int col = 0; col < geo[0].length; col++) {

// your code goes here

if (geo[0][col].startsWith("M"))

System.out.println(geo[0][col]);

}

System.out.println("Done exercise 9a2.\n");

// ------> exercise 9a3

// this code prints all the cities in the second row (the row at index 1) of

// the array geo.

for (int col = 0; col < geo[1].length; col++) {

// your code goes here

System.out.println(geo[1][col]);

}

System.out.println("Done exercise 9a3.\n");

// ------> exercise 9a4

// this code prints all the elements of the array geo.

for (int row = 0; row < geo.length; row++) {

// your code goes here

for (int col = 0; col < geo[row].length; col++) {

System.out.println(geo[row][col]);

}

}

System.out.println("Done exercise 9a4.\n");

int[][] a = { { 9, 6, 8, 10, 5 }, { 7, 6, 8, 9, 6 }, { 4, 8, 11, 5, 6 } };

// ------> exercise 9a5

// this code calculates and prints the sum of all the elements in the array

// a.

int sum = 0;

for (int row = 0; row < a.length; row++) {

// your code goes here

for (int col = 0; col < a[row].length; col++) {

sum += a[row][col];

}

}

System.out.println("sum of all elements in array a = " + sum);

System.out.println("Done exercise 9a5.\n");

// ------> exercise 9a6

// this code calculates and prints the number of times the value 8 appears

// in the array a.

int numberOfEights = 0;

for (int row = 0; row < a.length; row++) {

// your code goes here

for (int col = 0; col < a[row].length; col++) {

if(a[row][col]==8)

numberOfEights++;

}

}

System.out.println("# of 8s in a = " + numberOfEights);

System.out.println("Done exercise 9a6.\n");

// ------> exercise 9a7

// this code calculates and prints the number of times the value 6 appears

// in the second row

// (i.e., the row whose index is 1) of array a.

int numberOfSixes = 0;

// your code goes here

for (int col = 0; col < geo[1].length; col++) {

if(a[1][col]==6)

numberOfSixes++;

}

System.out.println("# of 6s in the second row = " + numberOfSixes);

System.out.println("Done exercise 9a7.\n");

// ------> exercise 9a8

// this code calculates the sum of the elements in the third column (i.e,

// the column with index 2) of array a.

int columnSum = 0;

for (int row = 0; row < a.length; row++) {

// your code goes here

columnSum += a[row][2];

}

System.out.println("sum of elements in the third column = " + columnSum);

System.out.println("Done exercise 9a8.\n");

// ------> exercise 9a9

// this code calculates the sum of the elements in the second row (i.e, the

// row with index 1) of array a.

int rowSum = 0;

for (int col = 0; col < a[1].length; col++) {

// your code goes here

rowSum += a[1][col];

}

System.out.println("sum of elements in the second row = " + rowSum);

System.out.println("Done exercise 9a9.\n");

// ------> exercise 9a10

// this code calculates and prints totals per row of array a.

for (int row = 0; row < a.length; row++) {

// your code goes here

rowSum = 0;

for(int col = 0; col<a[row].length; col++){

rowSum += a[row][col];

}

System.out.println("sum of elements in row " + row + " = " + rowSum);

}

System.out.println("Done exercise 9a10.\n");

// ------> exercise 9a11

// this code finds and prints the largest value of array a.

int maxValue = Integer.MIN_VALUE;

for (int row = 0; row < a.length; row++) {

// your code goes here

for(int col = 0; col<a[row].length; col++){

if(maxValue < a[row][col])

maxValue = a[row][col];

}

}

System.out.println("the largest value in array a = " + maxValue);

System.out.println("Done exercise 9a11.\n");

// ------> exercise 9a12

// this code finds the "smallest" row of array a (the row with the smallest

// sum of the elements)

// and prints the its index, its sum, and its elements

int minValue = Integer.MAX_VALUE;

int minIndex = -1;

for (int row = 0; row < a.length; row++) {

// your code goes here

rowSum = 0;

for(int col = 0; col<a[row].length; col++){

rowSum += a[row][col];

}

if(minValue > rowSum)

minValue = rowSum;

minIndex = row;

}

System.out.println("the smallest row of array a = " + minValue+", Index: "+minIndex);

System.out.println("Done exercise 9a12.");

// ------> exercise 9a13

// this code creates a single dimensional array of boolean with the number

// of elements equal to the number

// of rows in array a. Every element of the boolean array should be set to

// true if the sum of the elements

// in the corresponding row in array a is greater than 35.

// Prints the boolean array.

boolean b[] = new boolean[a.length];

for (int row = 0; row < a.length; row++) {

rowSum = 0;

for(int col = 0; col<a[row].length; col++){

rowSum += a[row][col];

}

if(rowSum>35)

b[row] = true;

else

b[row] = false;

}

for(int i=0; i<b.length; i++){

System.out.print(b[i]+" ");

}

System.out.println();

System.out.println("Done exercise 9a13.");

// ------> exercise 9a14

// this code sets to 0 all the elements of the even-numbered rows and sets

// to 1 all the elements of

// the odd-numbered rows of array a. Prints all the elements of the updated

// array

for (int row = 0; row < a.length; row++) {

for(int col = 0; col<a[row].length; col++){

if(row%2==0)

a[row][col] = 0;

else

a[row][col] = 1;

}

}

for (int row = 0; row < a.length; row++) {

for(int col = 0; col<a[row].length; col++){

System.out.print(a[row][col]+" ");

}

}

System.out.println();

System.out.println("Done exercise 9a14.");

}

}

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