(A)

The Memory class: Create a public class called Memory which represents the memory unit in our computer simulator and that contains:

o A private attribute called contents of an array of integers. This attribute will reference an array object that holds the contents of our memory unit. o A private attributed called size that represents the size of the memory unit.

o A one-argument constructor that sets size to a given value and creates an array with the given size for contents.

o The following setter and getter methods:

getValue(int address) to read the value at a given memory address

setValue(int address, int value) to write at a given memory address.

Both of the above methods should check the validity of the address. If not valid (i.e. not in the range from 0 to (size-1) inclusive, an error message should be displayed (and the value -1 should be returned for the getter method).

o A method showContents which displays the contents of the memory unit.

o A method LoadMemory to initializes the array with the values provided in the above example. These values correspond to a default program downloaded into the memory.

(B)

Create a class Terminal that has three static methods:

o input() that returns an integer value read from the keyboard. The method should first print the question mark (?), wait for a value, and then return it.

o output(String msg) that prints on the screen the word OUTPUT followed by a colon (:) then the value of msg.

o output(int msg) same as above except that it receives integer arguments.

(C)

Testing: Create a class called Test that include code to test your classes and ensure that your code works properly. For example, create a memory object with size =100, load the default program, set a value at any address, and finally display the memory contents. Also, invoke the methods of the Terminal class without creating any objects in your test program.

HERE IS MY CODE: CAN SOMEONE EXPLAIN WHAT I AM DOING WRONG?

(A)

import java.util.Arrays;

import java.util.Scanner;

public class Memory {

private int[] contents;

private int size;

public Memory(int size){

this.size=size;

contents = new int[size];

}

public int getValue(int address){

return contents[address];

}

public void setValue(int address, int value){

if ((address>=0) && (address<=(size-1))){

contents[address] = value;

}else{

System.out.println("Error!");

}

}

public void showContents(){

System.out.println(Arrays.toString(contents));

}

public void LoadMemory(int numValues){

Scanner input = new Scanner(System.in);

System.out.print("Enter " + numValues + " values: ");

for (int i = 0; i < numValues; i++)

contents[i] = input.nextInt();

}}

(B)

import java.util.Scanner;

public class Terminal {

public static double input(){

Scanner input = new Scanner(System.in);

System.out.print("? ");

double v = input.nextDouble();

return v;

}

public static void output(String msg){

System.out.println("OUTPUT: "+ msg);

}

public static void output(int msg){

System.out.println("OUTPUT: "+ msg);

}

}

(C)

public class Test {

public static void main(String[] args) {

Memory t1 = new Memory(100);

t1.LoadMemory(10);

t1.setValue(3, 021);

t1.showContents();

input(); //from terminal class

output(happiness);

output(12);

}

}