经典笔试题-使用二分查找法找字符串数组{"a","b","c","d","e","f","g","h"}中"g"元素

public class Query4Half {  
 static int bsearch( String[] a, String v ) {  
  int l, r;  
  l = 0; r = a.length-1;  
  while ( l <= r ) {  
  int m = (l+r)/2;  
  if ( a[m].compareTo(v)==0 ) return m; else  
  if ( a[m].compareTo(v)>0 ) r = m-1; else  
  if ( a[m].compareTo(v)<0 ) l = m+1;  
  }  
  return -1;  
  }  
 public static void main(String[] args) {  
    String str[] = {"a","b","c","d","e","f","g","h"};    
    int bsearch = bsearch(str, "g");  
    System.out.println(bsearch);  
 }