After building basics in java ,now its
time to pack your thoughts and come in the world of arrays.
you have already
wanted to learn arrays but due to some way or another you didn't do
that.your.probably your instructor or your friends call you dumb who can not
learn arrays.so here is goes THE MAKING OF ARRAYS
An array is like a tray of cups.
Steps
to declare an array.
step 1. Declare an
int array variable .an array variable is a remote control to an array object.
int[] nums;
step 2.
create a new int array with length of 7,and assign it to the previously
declared int[] variable nums
nums=new int[7];
step 3. give
each element in the array an int value.
remember elements in an int array are just
int variables.
nums[0]=6;
nums[1]=7;
nums[2]=12;
nums[3]=16;
nums[4]=62;
nums[5]=36;
nums[6]=55;
you can also make
arrays of Dogs instead of nums..............
declare a DOG
array variable
Dog[] pets;
create a new name
array with a length of five ,and assign it to previously declared name[]
variable names.
pets=new Dog[7];
create a new dog
objects and assign them to the array elements.
pets[0]=new Dog();
pets[1]=new Dog();
............................
you can also
access them as
Dog fido=new
Dog();
fido.name="FIDO";
fido.bark(0;
fido.chasecat(0;
*********************************************************************************
programs
MATRIX ADDITION
import
java.util.scanner.*;
class Addm
{
public
static void main(String[] arg)
{
int i,j;
int
a[][]=new int[3][3];
Scanner
sc=new Scanner(System.in);
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
a[i][j]=sc.nextInt();
}
}
int
b[][]=new int[3][3];
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
b[i][j]=sc.nextInt();
}
}
int c[][]=new
int[3][3];
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
c[i][j]=a[i][j]+b[i][j];
System.out.println("Matrix
Addition="+c[i][j]);
}
}
}
}
*********************************************************************************
DIAGONAL OF MATRIX
import
java.util.Scanner;
class Diagonalm
{
public
static void main(String[] arg)
{
int i,j;
int
a[][]=new int[3][3];
Scanner
sc=new Scanner(System.in);
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
a[i][j]=sc.nextInt();
}
}
System.out.println("Left
diagonal elements=0");
for(int
k=0;k<3;k++)
{
for(int l=0;l<3;l++)
{
if(k==l)
{
System.out.println(a[k][l]);
}
}
}
System.out.println("Right
diagonal elements=0");
for(int
m=0;m<3;m++)
{
for(int n=0;n<3;n++)
{
if(m+n==2)
{
System.out.println(a[m][n]);
}
}
}
}
}
*********************************************************************************
example to see a dog barking
class Dog
{
String name;
public static void
main(string[] args)
{
//make a dog
object and access it
Dog dog1=new
Dog();
dog1.bark();
dog1.name="bart";
// now make a dog array
Dog[] mydogs=new
Dog[3];
// put some dogs
in it
mydogs[0]=new
dog();
mydogs[1]=new
dog();
mydogs[2]=dog1;
//now access dogs
using arrays and
mydog[0].name="fred";
mydogs[1].name="marge";
//now loop through
the array
// nad tell all
the dogs to bark
int x=0;
while(x<mydogs.length)
{
mydogs[x].bark();
x=x+1;
}
}
public void bark(0
{
System.out.println(name+"says
ruff|");
}
public void eat()
{
}
public void
chasecat()
{}
}
******************************************************************************
this was just
enough to get your hands in array for nay further information comment below.
