![SEVERALVARIABLESATONCE?
Arraycomesto the rescue!
• Justalist of variables
• Declarethe array
int [] array;
• Initialize the array and set it'ssize
array =new array[3];
• Storevaluesinto array
array[0] =2;
array[1] =3;
array[2] =7;](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-5-320.jpg)
![DECLARATION
• Declaring
Arrays:
Int[] mark; Byte[]
age; Double[]
height;
Int mark[]; Byte
age[];
Double height[];
Data type
Array
Name
worksbut not preferredway
preferredway](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-6-320.jpg)
![DECLARATIONCOUNT…
• Array declaration in C++
int hardy[10];
• Array declaration in Java
int [] hardy;
hardy=new int[10];](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-7-320.jpg)
![DECLARATIONCOUNT…
• Storage for the array itself is not allocated
until you use “new”.
• For initializing method the “new” command is
not needed.
int [] hardy={5,3,7,89,2};](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-8-320.jpg)
![CONSTRUCTION
Int [] hardy;
hardy=new int[5];
In single line
Int[] hardy=new
int[5];
Hardyarray](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-9-320.jpg)
![INITIALIZATION
• Initialization isloading the array withthe valies.
Int[] hardy=newint[5]
hardy[0]=32
;
hardy[1]=12
;
hardy[2]=66
;
32 12 66 54 43
0 1 2 3 4
index](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-10-320.jpg)
![TWODIMENSIONALARRAY
• Int[][] hardy=new
int[2][3]; hardy[0][0]=32;
hardy[0][1]=12;
hardy[0][2]=66;
hardy[1][0]=54;
hardy[1][1]=43;
hardy[1][2]=36;
32 12 66 54 43 36
0 1
0 1 2 0 1 2](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-11-320.jpg)
![TWO DIMENSIONAL ARRAY -
NON UNIFORM
• Int[][] hardy=newint[2];
• Mark[0]=newint[3];
• Mark[1]=newint[4];
0 1
0 1 2 0 1 2 3](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-12-320.jpg)
![MULTIDIMENSIONALARRAY
• Int[][][] hardy=newint[2][3][2];
0 1
0 1 2 0 1 2
0 1 0 1 0 1 0 1 0 1 0 1](https://image.slidesharecdn.com/arraysinjava-oopj-210622081942/85/Arrays-in-java-oopj-13-320.jpg)
Arrays in java oopj
- 1. Prepared by- Shaishav shah(170120116094) Guided by – Prof. Nisha Patel Gandhinagar Institute of Technology SUBJECT - OOPJ (2150704) Arrays in Java
- 2. WHATISARRAY? Java provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
- 3. ARRAYS • DECLARA TION • CONSTRUCTION • INITIALIZATION • TWODIMENSIONALARRA Y • MULTIDIMENSIONALARRA Y
- 4. WHYARRAY? Problem? •Implement an application that will calculate 100 students exam average. •Variables needed? int studentA; int studentB; int studentC; int studentD; ...
- 5. SEVERALVARIABLESATONCE? Arraycomesto the rescue! • Justalist of variables • Declarethe array int [] array; • Initialize the array and set it'ssize array =new array[3]; • Storevaluesinto array array[0] =2; array[1] =3; array[2] =7;
- 6. DECLARATION • Declaring Arrays: Int[] mark; Byte[] age; Double[] height; Int mark[]; Byte age[]; Double height[]; Data type Array Name worksbut not preferredway preferredway
- 7. DECLARATIONCOUNT… • Array declaration in C++ int hardy[10]; • Array declaration in Java int [] hardy; hardy=new int[10];
- 8. DECLARATIONCOUNT… • Storage for the array itself is not allocated until you use “new”. • For initializing method the “new” command is not needed. int [] hardy={5,3,7,89,2};
- 9. CONSTRUCTION Int [] hardy; hardy=new int[5]; In single line Int[] hardy=new int[5]; Hardyarray
- 10. INITIALIZATION • Initialization isloading the array withthe valies. Int[] hardy=newint[5] hardy[0]=32 ; hardy[1]=12 ; hardy[2]=66 ; 32 12 66 54 43 0 1 2 3 4 index
- 11. TWODIMENSIONALARRAY • Int[][] hardy=new int[2][3]; hardy[0][0]=32; hardy[0][1]=12; hardy[0][2]=66; hardy[1][0]=54; hardy[1][1]=43; hardy[1][2]=36; 32 12 66 54 43 36 0 1 0 1 2 0 1 2
- 12. TWO DIMENSIONAL ARRAY - NON UNIFORM • Int[][] hardy=newint[2]; • Mark[0]=newint[3]; • Mark[1]=newint[4]; 0 1 0 1 2 0 1 2 3
- 13. MULTIDIMENSIONALARRAY • Int[][][] hardy=newint[2][3][2]; 0 1 0 1 2 0 1 2 0 1 0 1 0 1 0 1 0 1 0 1