Constants are unchangeable and variables are changing its values throughout the program. After a program is compiled, literal strings (Also known as literal constants) never change. Also, the value stored in symbolic constants never change. You create a symbolic constant by inserting the keyword “final” before a variable name. By convention, constant fields are written using upper case letters. A constant must be initialized with a value.
Ex:
static final int COMPANY_ID = 57575;
static final private int COMAPNY_ID = 52525;
Sample Program:
Case: We will define a constant and then used it straight away.
public class Constants
{
static final int COMPANY_ID = 56644;
public static void main(String[] args)
{
System.out.println("Company ID is: " + COMPANY_ID);
anotherMethod();
}
public static void anotherMethod()
{
System.out.println("Company ID is: " + COMPANY_ID);
}
}
The output is:
Ex:
static final int COMPANY_ID = 57575;
static final private int COMAPNY_ID = 52525;
Sample Program:
Case: We will define a constant and then used it straight away.
public class Constants
{
static final int COMPANY_ID = 56644;
public static void main(String[] args)
{
System.out.println("Company ID is: " + COMPANY_ID);
anotherMethod();
}
public static void anotherMethod()
{
System.out.println("Company ID is: " + COMPANY_ID);
}
}
The output is:
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