JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java One Dimensional Arrays

One dimensional array is a list of same typed variables. To create an array, first you must declare an array variable of required type, the syntax is given below:

type variable-name[];

Example:

int account_numbers[];

To allocate memory or create array object the syntax is given below:

variable-name = new type[size of the array];

Example:

account_numbers = new int[10];

You must specify the size of the array during creating object.

After this statement, account_numbers will refer to 10 integers, and assigned to 0. You can access any element by index, array index starts with 0 and ends with (array length-1). We can assign array values as given below:

account_numbers[0] = 1016;
account_numbers[1] = 449;
account_numbers[2] = 1015;

The below line displays the value stored at index 1.

System.out.println(account_numbers[1]);

We can combine declaration of an array with allocation of array as given below:

int account_numbers[] = new int[10];

Arrays can be initialized when they are declaring as given below:

int account_numbers[] = {12,34,56,12,78,98,34};

Other Java Array Examples

Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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