34 lines
1017 B
Java
34 lines
1017 B
Java
// arrays/ArraySearching.java
|
|
// (c)2021 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
// Using Arrays.binarySearch()
|
|
import java.util.*;
|
|
import onjava.*;
|
|
import static onjava.ArrayShow.*;
|
|
|
|
public class ArraySearching {
|
|
public static void main(String[] args) {
|
|
Rand.Pint rand = new Rand.Pint();
|
|
int[] a = new Rand.Pint().array(25);
|
|
Arrays.sort(a);
|
|
show("Sorted array", a);
|
|
while(true) {
|
|
int r = rand.getAsInt();
|
|
int location = Arrays.binarySearch(a, r);
|
|
if(location >= 0) {
|
|
System.out.println(
|
|
"Location of " + r + " is " + location +
|
|
", a[" + location + "] is " + a[location]);
|
|
break; // Out of while loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* Output:
|
|
Sorted array: [125, 267, 635, 650, 1131, 1506, 1634,
|
|
2400, 2766, 3063, 3768, 3941, 4720, 4762, 4948, 5070,
|
|
5682, 5807, 6177, 6193, 6656, 7021, 8479, 8737, 9954]
|
|
Location of 635 is 2, a[2] is 635
|
|
*/
|