Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

注意考虑几个情况，x=1534236460 1534236469 -2147483647等等。

写的代码有点冗长了。

public class Solution {
    public int reverse(int x) {

    
        if(x<0){//负数
            
            long xx = x;
            xx=xx*(-1);
            if(xx>Integer.MAX_VALUE){
                //    System.out.println("///////");
                    return 0;
                }
        
            Integer num = new Integer(x);
            num=-num;
            String s = num.toString();
            StringBuilder sb = new StringBuilder(s);
            sb.reverse();
            String ss = sb.toString();
            
            if(Long.parseLong(ss)>Integer.MAX_VALUE){
            //    System.out.println("///////");
                return 0;
            }
            int i = -Integer.parseInt(ss);
            return i;
            }
        
        else{//正数
                Integer num = new Integer(x);
                String s = num.toString();
                StringBuilder sb = new StringBuilder(s);
                sb.reverse();
                String ss = sb.toString();
        
        
            if(Long.parseLong(ss)>Integer.MAX_VALUE){
            //    System.out.println("///////");
                return 0;
            }
    
            return Integer.parseInt(ss);
            }
        
    }

}

 312 ms.