Java Array Operations
May 2nd, 2019
Array Operations in Java
What is Array?
- Array is the set of Variables with the same Datatype.
- Array is the fixed size.
- Array will be Iterated by the index.
Below is the example for the String. Same like we can create the Array for int and further datatype.
String[] arr= {“GangBoard”,”Online”,”Training”,”Centre”};
Array can’t be extended in size.
Advantages :
- Code Simplicity
- Can use the Array for same Datatype.
Disadvantage:
- Can’t extend the size of the Array.
Example:
String[] str= new String[5]; // Declaration and initiation.
str[0]=”GangBoard”; //Defining the data
str[1]=”Online”;
str[0]=”Training”;
str[2]=”Centre”;
str[3]=”Chennai”;
str[4]=”600045”;
//iterating the data
for(int i=0; i<5;i++)
https://www.gangboard.com/blog/wp-admin/admin.php?page=wpseo_dashboard
System.out.prin(str[i]+”,”);
|
Output:
| GangBoard, Online, Training, Centre, Chennai, 600045 |
Note:
If we select more than 5 entries, then we will face the ArrayIndexOutodBoundException.
Simple Functions in Array:
Array Length:
To find out the length of the Array.
Example:
String[] alps ={“apple”,”ball”,”cat”,”doll”,”ear”,”flight”};
System.out.print(alps.length);
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Loop iteration through Array:
To get the values in the array by using the length of the array.
Example:
String[] alps ={“apple”,”ball”,”cat”,”doll”,”ear”,”flight”};
for(int i=0;i<alps.length;i++)
System.out.print(alps[i]+”,”);
|
Output:
| Apple, ball,cat, doll, ear, flight |
Multidimensional Array:
Example:
Array like matrix,
int[][] myMatrix = {{1,2,3,4,5},{6,7,8,9,0}};
int l=myMatrix[1][1];
System.out.println(l)
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OutPut:
Example with For:
int[][] myMatrix = {{1,2,3,4,5},{6,7,8,9,0}};
for(int i=0;i<2;i++)//it’s the row
{
for(int j=0;j<4;j++)//it’s the column
{
System.out.print(myMatrix[i][j]+”,”);
}
System.out.println();
}
|
OutPut:
| 1,2,3,4,5,
6,7,8,9,0,
|
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