課後習題page100.pp3.3

//***************************************************
//  phoneNumber.java   Author: Jayson
//***************************************************

import java.util.Random;

public class phoneNumber
{
	//--------------------------------------------------
	//  create a random phone number like xxx-xxx-xxxx
	//  first three number can not be 8 or 9
	//  and the mid three number should less than 655
	//-------------------------------------------------
	public static void main(String[] args)
	{
		int number;
		String result="";
		Random gennerator = new Random();
		
		number = gennerator.nextInt(8);
		result += number;
		
		number = gennerator.nextInt(8);
		result += number;
		
		number = gennerator.nextInt(8);
		result += number;
		
		result += "-";
		
		number = gennerator.nextInt(656);
		
		if(number<100)
			if(number<10)
				result += "00" + number;
			else
				result += "0" + number;
		else
			result += number;
		
		result += "-";
		
		number = gennerator.nextInt(10000);
		
		if(number<1000)
			if(number<100)
				if(number<10)
					result += "000" + number;
				else
					result += "00" + number;
			else
				result += "0" + number;
		else
			result += number;
		
		System.out.println(result);
	}
}