二分查找java代码

public int find(long searchKey){
        
        int i;
        int begin = 0;
        int end = nElems - 1;
                
        while(true){
            i = (begin + end) / 2;
            
            if (searchKey == a[i]){
                return i;
            } else if (begin > end) {
                return -1;
            } else if (searchKey > a[i]) {
                begin = i + 1;
            } else if (searchKey < a[i]) {
                end = i - 1; 
            }
        }
    }