Need some help please!
Can someone tell me a nice way of changing the code below so the size of the array, N, can be easily changed through the input from the user.
import java.util.Random;
/**
This class contains utility methods for array
manipulation.
*/
publicclass ArrayUtil
{
/**
Creates an array filled with random values.
@param length the length of the array
@param n the number of possible random values
@return an array filled with length numbers between
0 and n-1
*/
publicstaticint[] randomIntArray(int length,int n)
{int[] a =newint[length];
Random generator =new Random();
for (int i = 0; i < a.length; i++)
a[i] = generator.nextInt(n);
return a;
}
/**
Prints all elements in an array.
@param a the array to print
*/
publicstaticvoid print(int[] a)
{
for (int i = 0; i < a.length; i++)
System.out.print(a[i] +" ");
System.out.println();
}
}
[2021 byte] By [
Princea] at [2007-10-2 5:45:19]
> Anyone have an idea?
I must say you made good progress since your last visit here. These two methods look OK. Test them with this main method (you must have JDK 1.5 for this example):
/**
* main method
*/
public static void main(String[] args) {
java.util.Scanner keyboard = new java.util.Scanner(System.in);
System.out.print("Enter the length of the array: ");
int length = keyboard.nextInt();
System.out.print("Enter the maximal value: ");
int maximal = keyboard.nextInt();
int[] array = randomIntArray(length, maximal);
print(array);
}
Good luck.
import java.util.Arrays;
import javax.swing.JOptionPane;
/**
This program tests the binary search algorithm.
*/
public class BinarySearchTest
{
public static void main(String[] args)
{
// construct random array
int[] a = ArrayUtil.randomIntArray(20, 100); /** I need that 20 part to change according to user input. */
Arrays.sort(a);
ArrayUtil.print(a);
BinarySearcher searcher = new BinarySearcher(a);
boolean done = false;
while (!done)
{
String input = JOptionPane.showInputDialog(
"Enter number to search for, Cancel to quit:");
if (input == null)
done = true;
else
{
int n = Integer.parseInt(input);
int pos = searcher.search(n);
System.out.println("Found in position " + pos);
}
}
System.exit(0);
}
}
I dont have version 1.5 so it didnt work. I produced the code above to go with the code i posted earlier. I dont know how to incorporate "enter the array size" method with the coding. Any ideas how to add it?
String input = JOptionPane.showInputDialog(
"Enter array size:");
int n = Integer.parseInt(input);
This is what I have but im not sure if it works because i dont know how to add it to the coding properly.
> I dont have version 1.5 so it didnt work. I
> produced the code above to go with the code i posted
> earlier. I dont know how to incorporate "enter the
> array size" method with the coding. Any ideas how to
> add it?
Then you could do something like this:
/**
* main method
*/
public static void main(String[] args) {
String input;
int length, maximal;
input = javax.swing.JOptionPane.showInputDialog("Enter the length of the array: ");
length = Integer.parseInt(input);
input = javax.swing.JOptionPane.showInputDialog("Enter the maximal value: ");
maximal = Integer.parseInt(input);
int[] array = randomIntArray(length, maximal);
print(array);
}
