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Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
解法一:
public class Solution { public int reverse(int x) { if(x == 0){ return 0; } String result = ""; String flag = ""; if(x<0){ flag = "-"; } ArrayList<String> list = new ArrayList<String>(); while(x != 0){ int temp = x%10; list.add(temp+""); x = x/10; } for(String e:list){ result+=e; } result=flag+result.replace("-",""); if(Double.valueOf(result)>Math.pow(2,31)-1||Double.valueOf(result)<-Math.pow(2,31)){ return 0; } return Integer.valueOf(result); } }
解法二:
public class Solution { public int reverse(int x) { String s = x+""; char[] char_array = s.toCharArray(); int size = char_array.length; String re = ""; for(int i=0;i<size;i++){ re=re+char_array[size-i-1]; } if(x<0){ re="-"+re.replace("-",""); } if(Double.valueOf(re)>Math.pow(2,31)-1||Double.valueOf(re)<-Math.pow(2,31)){ return 0; } return Integer.valueOf(re); } }
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原文地址:http://www.cnblogs.com/mrpod2g/p/4257322.html