Slides are discussing how to use arrays in Java and most important contents related to java arrays. The given examples are supposed to have a good understanding of java arrays and how you apply those.

1. Arrays

2. Introduction
● Arrays are dynamically created objects
● Components - These variables are called the components. All are in same
type
● An array object contains a number of variables.(empty - Array has no
elements/components)
● index (location of the component)
● length of the array

3. Example 1
public class Arrayxsample {
public static void main(String[] args) {
int a[] = {1};
System.out.println(a[0]);
}
}

4. Example 2
public class Arrayxsample {
public static void main(String[] args) {
int a[] = {1,2,3,4,5};
System.out.println(a[3]);
}
}

5. Example 3
public class Arrayxsample {
public static void main(String[] args) {
int [] a = {4,3};
System.out.println(a[1]);
}
}

6. Example 4
public class Arrayxsample {
public static void main(String[] args) {
int [] a = {"4","3"};
System.out.println(a[1]);
}
}

7. Example 5
public class Arrayxsample {
public static void main(String[] args) {
int [] a = {1,2};
System.out.println(a[5]);
}
}

8. Declaring and allocation
int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array

9. Example 6
public class Arrayxsample {
public static void main(String[] args) {
int a[] = new int[5];
System.out.println(a[3]);
}
}

10. Example 7
public class Arrayxsample {
public static void main(String[] args) {
int [] a = new int [5];
a[0]=5;
a [4]=1;
System.out.println(a[4]);
}
}

11. Example 8
public class Arrayxsample {
public static void main(String[] args) {
int [2] a = new int [];
System.out.println(a[1]);
}
}

12. Example 9
public class Arrayxsample {
public static void main(String[] args) {
int [2] a = int a [];
System.out.println(a[1]);
}
}

13. Example 10
public class Arrayxsample {
public static void main(String[] args) {
int [] a = new int [4];
System.out.println(a[5]);
}
}

14. Example 11
public class Arrayxsample {
public static void main(String[] args) {
int [] a = new int [20];
for(int i =0;i<20;i++) {
a[i]=i;
}
System.out.println(a[15]);
}
}

15. Example 12
public class Arrayxsample {
public static void main(String[] args) {
int[] intArray = new int[]{ 1,2,3,4,5,6,7,8,9,10 };
System.out.println(intArray[5]);
}
}

16. expand this
public class Arrayxsample {
public static void main(String[] args) {
byte[] apple, orange, cake[];
int x,y[],z[];
}
}

17. Example 13
public class Arrayxsample {
public static void main(String[] args) {
int[] intArray = new int[]{ 1,2,3,4,5,6,7,8,9,10 };
System.out.println(intArray.length);
}
}

18. Example 14
public class Arrayxsample {
public static void main(String[] args) {
int[][] intArray = {{1,2},{3,4,5}};
System.out.println(intArray[0][1]);
System.out.println(intArray[1][0]);
System.out.println(intArray[1][2]);
}
}

19. Example 15
public class Arrayxsample {
public static void main(String[] args) {
int[][][] intArray = {{{1,2},{3,4}},{{5},{6,7,8}},{{9},{10,11,12}}};
System.out.println(intArray[0][1][0]);
System.out.println(intArray[1][0][0]);
System.out.println(intArray[2][1][2]);
}
}

20. Example 16
public class Arrayxsample {
public static void main(String[] args) {
int i,j,k;
int[][][] intArray = new int[100][100][100] ;
for(i=0,j=0,k=0;(i>10 || j> 0 && k>0);i++,j=j+2,k++) {
intArray[i][j][k]= (i+j)*k;
}
System.out.println(intArray[0][0][0]);
}
}

23. References
• https://docs.oracle.com/javase/specs/jls/se8/html/jls-10.html
• https://docs.oracle.com/javase/10/docs/api/java/util/Arrays.html

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