Single Dimension Array in Java

An array is a continuous location in memory where elements of the same type (datatype) are stored. An array consists of several locations, as defined, and are referenced by a common name. The different locations in an array are accessed by indeces as shown in the figure below.

To use an array in a program, you must declare an array first, then assign values to it and then access it within a loop.

Array Declaration

To declare an integer array:
```
 int a[] = new int[10];
```
To declare a String array:
```
 String a[] = new String[10];
```

To assign values to an array:

 System.out.println("Enter 10 integer values");
 try{
    for(i = 0; i < 10; i++){
      a[i] = Integer.parseInt(br.readLine());
     }
   }catch(Exception e){}

Accessing array elements

for(i= 0; i < 10; i++){
  System.out.println(a[i]);
}

Initializing arrays

Integer array

 int a[] = {31,28,31,30,31,30,31,31,30,31,30,31};

String array

 String str[] = {"Programming", "is", "fun"};

Float array:

 float a[] = {25.4f, 24.1f, 26.3f, 29.0f};

Character array:
```
 char ca[] = {'a', 'e', 'i', 'o', 'u'};
```

Single Dimension Array in Java

Array Declaration

Initializing arrays

Related Notes