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Taking the size of an Array at runtime & generate random numbers to populate the Array

By: Ganesh Iyer in Java Tutorials on 2009年05月29日 [フレーム]

A program which demonstrates by taking a number input from the screen and assign the length of the array at runtime alongwith output of an array elements randomly assigned within the input number.

//Author : Ganesh Iyer, Mobile (0)9176148207
//Program : Taking the size of an Array at runtime & generate random numbers to populate the Array
//Written on : 29th May 2009
//Include java packages
import java.io.*;
import java.lang.*;
import java.util.*;
class generateRan
{
 public static void main(String[] args)
 {
 int buffer, cnt;
 try { // To catch error
 //One of the method provided by JAVA in taking input from the screen
 BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
 System.out.println(\"Input the Array length in [0-9]\");
 //Casting string to Integer
 buffer = Integer.parseInt(r.readLine());
 //Check for zero & negative input through screen
 if (buffer==0 || buffer<0) { System.out.println(\"Not allowed\"); System.exit(1); } //Here is the heart of the program where Array is taking its length int[] mx = new int[buffer]; System.out.println(\"Populating Random elements for the array length are below \"+buffer); for (cnt=0; cnt< mx.length; cnt++) { mx[cnt] = (int) (Math.random()*buffer) + 1; System.out.print(\" \"+mx[cnt]); } } catch (IOException e) { //Output error System.err.println(\"Error occured\"+e); } // Closing exception } }

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