java£º¶þ·Ö²éÕÒ·¨
package arrays.compara;
/**
*
* @author Happy ¶þ·Ö²éÕÒ·¨
*/
public class BinarySearch {
public static void main(String[] args) {
int[] arrInt = { 2, 34, 32, 24, 23, 34, 12, 3, 4, 2 };
int index = bSearch(29, arrInt, 0, arrInt.length);
System.out.println("Index : " + index);
/*
* for (int i : arrInt) { System.out.println(i); }
*/
}
// js¶þ·Ö²éÕÒ·¨£¨Ã»Óгɹ¦£©
private static int bSerarch(int[] arrInt, int value) {
int startIndex = 0, stopIndex = arrInt.length - 1, middle = (int) (Math
.floor((stopIndex + startIndex) / 2));
while (arrInt[middle] != value && startIndex < stopIndex) {
// adjust search area£¨µ÷Õû²éÕÒ·¶Î§£©
if (value < arrInt[middle]) {
stopIndex = middle - 1;
} else if (value > arrInt[middle]) {
startIndex = middle + 1;
}
// recalculate middle£¨ÖØÐ¼ÆËãÖÐÏîË÷Òý£©
middle = (int) Math.floor((stopIndex + startIndex) / 2);
}
// make sure it's the right value£¨È·±£·µ»ØÕýÈ·µÄÖµ£©
return (arrInt[middle] != value) ? -1 : middle;
}
// java¶þ·Ö²éÕÒ·¨
private static void bSearch(int[] arrInt, int seek) {
// Òª²éÕÒµÄÖµ
// int seek = 33;
// ÀàËÆÓÚÖ¸ÕëµÄ¶«Î÷
int index = 0;
// ²éÕÒÆðʼϱê
int start = 0;
// ²éÕÒ½áÊøÏ±ê
int end = arrInt.length - 1;
// ¼ÆÊýÆ÷
int count = 0;
while (true) {
count++;
// ³õʼ»¯Êý×éÖмäÖµµÄϱê
// ÔÀ´Îªindex = (start + end) / 2;µ±start + endµÄÖµ³¬¹ýÁË×î´óµÄÕýintÖµµÄʱºò, index
// »á±ä³É¸ºÖµ,Õâ¸öʱºò¾Í»áÅ׳öÒì³£
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1.Welcome.java
import java.util.Date;
import java.util.Scanner;
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/**
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* @throws IOException
*/
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