java反轉(zhuǎn)字符串邊界溢出

反轉(zhuǎn)一個(gè)十進(jìn)制數(shù)，正負(fù)數(shù)邊界溢出報(bào)錯(cuò)，邊界設(shè)定了，為什么還是溢出？

class Solution {
    public int reverse(int x) {
      
        String s=new StringBuffer(Math.abs(x)+"").reverse().toString();  
        Integer newValue = Integer.valueOf(s);  
        
        if(x>0){  
            if(newValue>Integer.MAX_VALUE ||newValue<Integer.MIN_VALUE){  
                return 0;  
            }else{  
                return (int) newValue;  
            }  
        }else{  
              
                return (int)(0-newValue);  
              
        }  
    }
}
public class MainClass {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while ((line = in.readLine()) != null) {
            int x = Integer.parseInt(line);
            
            int ret = new Solution().reverse(-2147483648);
            
            String out = String.valueOf(ret);
            
            System.out.print(out);
        }
    }
}　

錯(cuò)誤：
Error:
Line 5: java.lang.NumberFormatException: For input string: "8463847412-"