Is there any intelligent person in the Java programming? plz

**alaseier** · May 14th, 2010, 09:34 AM

Please help me to solve this: (
Only three questions....

The questions given below are based on the lecture notes, and are intended to familiarize you with concepts of arrays, ArrayList and inheritance.

1. Arrays
Write a program that read in 16 values from the keyboard and store them into a two dimension array (myArray). The program then calculate the sum of every row elements and every column elements an put this sum into elements of two arrays (one for the rows – rowSum and the other for columns- colSum ) ,then the program print the three arrays.

2. ArrayList class

You are to write a simple names book program. A names book contains names of your friends. Store your names book as an ArrayList with entries contains strings that represent the names. Your program must tell you how many friends you have and which one of them has the longest name.

3. Inheritance

Design and draw the UML class diagram of a set of classes that define the employees of a Hospital, the classes are:
HospitalPerson , Doctor and Nurse.
Where HospitalPerson is a supper class, Doctor and Nurse are subclasses.

Design your classes to satisfy the following requirements:
1. Each HospitalPerson has a name and an idNumber.
2. A Doctor has in addition a specialty attribute, while a Nurse has a
maxDutyHours attribute.
3. We want to have a special print (output information) as following:
a. The name and idNumber of a HospitalPerson works for the Hospital.
b. The specialty of a Doctor.
c. The maxDutyHours of a Nurse.

**helloworld922** · May 14th, 2010, 10:24 AM

We won't do your homework for you. Please show us what you have done so far and we'll help you with any problems you have.

**alaseier** · May 14th, 2010, 01:32 PM

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class ArrayProgram {
 
public static void main(String[] args)
{
final BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
// Get the 16 numbers from the user and store them into a one dimensional array
int[] myArray = new int[16];
for (int i = 0; i <myArray.length; i++) {
System.out.print("Enter number: ");
System.out.print(i + 1);
System.out.println(" in one dimensional array:"); {
 
myArray = Integer.valueOf(input.readLine()).intValue();
} catch (IOException e) {
 
e.printStackTrace();
System.exit(1);
} 
}

__________________________?

is right?

**dlorde** · May 14th, 2010, 01:41 PM

Originally Posted by alaseier

is right?

Which is the question that asks you to put 16 numbers into a one-dimensional array?

**alaseier** · May 14th, 2010, 01:52 PM

Originally Posted by dlorde

Which is the question that asks you to put 16 numbers into a one-dimensional array?

Write a program that read in 16 values from the keyboard and store them into a two dimension array (myArray).

**dlorde** · May 14th, 2010, 02:07 PM

Originally Posted by alaseier

Write a program that read in 16 values from the keyboard and store them into a two dimension array (myArray).

No, that's a question about a two dimensional array, not a one dimensional array. Notice the difference?

**alaseier** · May 14th, 2010, 02:13 PM

how can solve that???

**Darryl.Burke** · May 14th, 2010, 02:31 PM

Link --> The Java™ Tutorials

db

**scribbleno1** · May 14th, 2010, 02:41 PM

int[][] TwoD = new int[50][50];

**helloworld922** · May 14th, 2010, 04:39 PM

In java, two dimensional arrays are just arrays of arrays. So it depends on how you want to store them into the array.

So, say you wanted to store your data into a 4x4 array (makes sense since you have 16 numbers):

int[][] data = new int[4][4];
Scanner reader = new Scanner(System.in);
for (int i = 0; i < 4; i++)
{
    for (int j = 0; j < 4; j++)
    {
        System.out.print("Enter a number to put into [" + i + "][" + j + "]: ");
        data[i][j] = reader.nextInt();
    }
}

Of course, a 1-d Array can be propogated easily into a 2-D array:

int[] oneDimension = new int[16];
int[][] twoDimensions = new int[1][];
twoDimensions[0] = oneDimension; // now have a 1x16 array

**alaseier** · May 17th, 2010, 11:37 AM

Originally Posted by helloworld922

In java, two dimensional arrays are just arrays of arrays. So it depends on how you want to store them into the array.

So, say you wanted to store your data into a 4x4 array (makes sense since you have 16 numbers):

int[][] data = new int[4][4];
Scanner reader = new Scanner(System.in);
for (int i = 0; i < 4; i++)
{
    for (int j = 0; j < 4; j++)
    {
        System.out.print("Enter a number to put into [" + i + "][" + j + "]: ");
        data[i][j] = reader.nextInt();
    }
}

Of course, a 1-d Array can be propogated easily into a 2-D array:

int[] oneDimension = new int[16];
int[][] twoDimensions = new int[1][];
twoDimensions[0] = oneDimension; // now have a 1x16 array

import java.util.Scanner;
import java.util.ArrayList;
 public class Data
 {
public static void main(String[] args)
{
int[][] data = new int[8][8];
Scanner reader = new Scanner(System.in);
for (int i = 0; i < 4; i++)
{
    for (int j = 0; j < 8; j++)
    {
        System.out.print("Enter a number to put into [" + i + "][" + j + "]: ");
        data[i][j] = reader.nextInt();
    }
}

-------------------------------------------------------------------------------------------------
Is rigth now?

**javanub:(** · May 17th, 2010, 10:01 PM

sorry, i aint smart. cant help you. HAHA!

**helloworld922** · May 18th, 2010, 12:08 AM

Without knowing how it is you want it stored, there's no way for me to know if it's right or wrong. However, I will tell you that you are entering in 4 rows of data at 8 columns each, so that's 4 * 8 = 32 numbers, which may or may not be what you want since you said you wanted 16 numbers entered.

**alaseier** · May 24th, 2010, 03:08 AM

import java.util.Scanner;
 
 
public class TowDArray{
 public static void main(String[] args){
 
  int[][] myArray=new int[4][4];
  Scanner in=new Scanner(System.in);
  System.out.println("ENTER THE NUMBER");
 
  for(int row=0; row<myArray.length; row++)
  for(int col=0; col<[row].length; col++)
  myArray[row]=in.nextInt();
  myArray[col]=in.nextInt();
 
   for(int row=0; row<myArray.length; row++)
   for(int col=0; col<[row].length; col++)
   System.out.println(myArray[row][col]);
 
   int b=0;
   int[] rowSum=new int[4];
   for(int row=0; row<rowSum.length; row++)
   rowSum[row]=rowSum[row]+b;
   System.out.println("THE ROWS SUM :");
   System.out.println(rowSum[row]);
 
   int[] colSum=new int[4];
   for(int col=0; col<colSum.length; col++)
   colSum[col]=colSum[col]+b;
   System.out.println("THE COLUMNS SUM :");
   System.out.println(colSum[col]);
}
}

--------------------------------

tell me of now is rigth.

**Lord.Quackstar** · May 24th, 2010, 07:10 AM

Originally Posted by alaseier

tell me of now is rigth.

Are you even testing this? Just use System.out.println as debugging statements. Print the array and see if thats what you want. If you still can't get it, then read some of the Java tutorials, their actually kinda good

**javapenguin** · June 4th, 2010, 02:12 PM

Originally Posted by alaseier

Please help me to solve this: (
Only three questions....

The questions given below are based on the lecture notes, and are intended to familiarize you with concepts of arrays, ArrayList and inheritance.

1. Arrays
Write a program that read in 16 values from the keyboard and store them into a two dimension array (myArray). The program then calculate the sum of every row elements and every column elements an put this sum into elements of two arrays (one for the rows – rowSum and the other for columns- colSum ) ,then the program print the three arrays.

What kind of array? char, int, long, String, double, short, float, class, etc?

int n ;
System.out.println("Enter the number of rows. ");
n = console.nextInt();
System.out.println("Enter the number of columns. ");
v = console.nextInt();

dataType myArray = new dataType[n][v];

Use the clone method to get others. To get sum of elements in rows:

sum = 0;
int col = 0;
row = // row number;
// this finds the sum of elements in row n;

for (col = 0; col < myArray[row].length; col++)
sum = sum + myArray[col][row];

// sum of each individual row

for (row = 0; row < myArray.length; row++)
{
sum = 0;
for (col = 0; col < myArray[row].length; col++)
sum = sum + myArray[row][col];
// each final sum value is one element
// add the sum values of each row to get array.

// sum of each individual column

int col2, row2, sum2;
col2 = 0;
row2 = 0;
sum2 = 0;

for (col 2= 0; col2< myArray[0].length; col2++)
{
sum 2= 0;
for (row2 = 0; row2 < myArray.length; row2 ++)
sum2 = sum2 + myArray[row2][col2];
// each final sum value is an element;
// add the sum values for all columns to get array.

}

2. ArrayList class

You are to write a simple names book program. A names book contains names of your friends. Store your names book as an ArrayList with entries contains strings that represent the names. Your program must tell you how many friends you have and which one of them has the longest name.

Use compareTo() perhaps.

Could you use a fileReader or something to get them in? If so, throw a FileNotFoundException at the end of the declaration of main.

3. Inheritance

Design and draw the UML class diagram of a set of classes that define the employees of a Hospital, the classes are:
HospitalPerson , Doctor and Nurse.
Where HospitalPerson is a supper class, Doctor and Nurse are subclasses.

Design your classes to satisfy the following requirements:
1. Each HospitalPerson has a name and an idNumber.
2. A Doctor has in addition a specialty attribute, while a Nurse has a
maxDutyHours attribute.
3. We want to have a special print (output information) as following:
a. The name and idNumber of a HospitalPerson works for the Hospital.
b. The specialty of a Doctor.
c. The maxDutyHours of a Nurse.

Sounds more like composition.

Inheritance is an "is a" relationship.
Composition is a "has a" relationship.

Nurse and Doctor are inherited from HospitalPerson yes, as Doctor is a HospitalPerson and Nurse is a Hospital Person.

Public class Doctor Extends HospitalPerson
{

public Doctor()
{

}

}

Also, if you're overriding a method, use method name of superclass like this.
super.methodOfSuperClass(methodsParameters);

It seems you could either have abstract methods, methods defined like so:

public abstract String getName();
public abstract String getIDNumber();

in class HospitalPerson and define them in Doctor and Nurse.....
or you could use composition and use a "has a relationship" for name and IDNumber.

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