Array Search Test : Arrays « Collections Data Structure « Java
Array Search Test
import java.util.*;
public class SearchTestDemo {
public static void main(String args[]) throws Exception {
int array[] = {2, 5, -2, 6, -3, 8, 0, -7, -9, 4};
// Ensure array sorted
Arrays.sort(array);
printArray("Sorted array", array);
// Search for element in array
int index = Arrays.binarySearch(array, 2);
System.out.println("Found 2 @ " + index);
// Search for element not in array
index = Arrays.binarySearch(array, 1);
System.out.println("Didn't find 1 @ " + index);
// Insert
int newIndex = -index - 1;
array = insertElement(array, 1, newIndex);
printArray("With 1 added", array);
}
private static void printArray(String message, int array[]) {
System.out.println(message + ": [length: " + array.length + "]");
// Print out sorted array elements
for (int i=0, n=array.length; i<n; i++) {
if (i != 0) System.out.print(", ");
System.out.print(array[i]);
}
System.out.println();
}
private static int[] insertElement(int original[], int element, int index) {
int length = original.length;
int destination[] = new int[length+1];
System.arraycopy(original, 0, destination, 0, index);
destination[index] = element;
System.arraycopy(original, index, destination, index+1, length-index);
return destination;
}
}
