FACTORY METHODS ILLUSTRATION IN JAVA AN EXAMPLE TO SET EXACTLY REQUIRED PRECISION AT DISPLAY OF OUTPUT

this is the program illustrates how we can print the output as required format it is achieved by the Number Format class they may be instance or abstract class for this type of classes we can’t create Objects by new operator but   some static methods exist to use that they are called as Factory Methods by using that Factory Methods we can behave a variable as Number Format class object So that all methods provide by that class we can make available to our program

import java.lang.*;

import java.io.*;

import java.text.*;

class number

{

public static void main(String args[])   throws Exception

{

double d=1.24789316;

System.out.println("before the value of "+d);

NumberFormat nf=NumberFormat.getNumberInstance();

DataInputStream k=new DataInputStream(System.in);

System.out.println("\n enter the howmany numbers");

int fd=Integer.parseInt(k.readLine());

nf.setMaximumFractionDigits(fd);

nf.setMinimumIntegerDigits(4);

String x=nf.format(d);

System.out.println("\n the output after format is\t\t"+x);

}

}