LeetCode405 Convert a Number to Hexadecimal

LeetCode405 Convert a Number to Hexadecimal

想到了一种新的方法,比以前的方法的效率要稍微好一些

public class solution {public String toHex(int num) {StringBuffer sb = new StringBuffer();//使用逻辑右移的方式进行处理char[] arr = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};if(num == 0) return "0";else if(num > 0) {while(num > 0) {sb.append(arr[num & 15]);num = num >>> 4;}return sb.reverse().toString();}else if(num < 0) {num = -num - 1;while(num > 0) {sb.append(arr[15 - num & 15]);num = num >>> 4;}while(sb.length() < 8) {sb.append("f");}return sb.reverse().toString();}return null;}}