题解 | #整数反转#

import java.util.*;

public class Solution { public int reverse (int num) { String str = String.valueOf(num); if(str.length()>9) return 0; StringBuilder sb=new StringBuilder(); if(str.charAt(0)!='-'){ for (int i = str.length()-1; i >= 0; i--) { sb.append(str.charAt(i)); } }else { sb.append("-"); for (int i = str.length()-1; i >= 1; i--) { sb.append(str.charAt(i)); }

    }
    return Integer.parseInt(sb.toString());
}

}