java - "cannot find symbol: variable"尽管声明了变量

Question

当我编译下面的代码时，它说:

"error: cannot find symbol: variable max"

但我确实定义了变量max....

public class Solution {
    public static  boolean isOneEditDistance(String s, String t) {
            if (s.length() >= t.length() ) {
                    StringBuilder a = new StringBuilder (s);
                    StringBuilder b = new StringBuilder (t);
                    int max = s.length();
                    int min = t.length();
            }
            else {
                    StringBuilder a = new StringBuilder (t);
                    StringBuilder b = new StringBuilder (s);
                    int max = t.length();
                    int min = s.length();
            }

            int flag = 0;

            if ( (max-min)>1 )
                    return flase;
            else if ( (max-min)==1 ) {
                .....

Answer 1

我更喜欢如下所示的代码，这也避免了由于 a 和 b 被限定在 if 语句中包含的 block 中而导致的问题。

 if( s.length() < t.length() ){
     String h = s; s = t; t = h;
 }
 // now s is not shorter than t
 int max = s.length();
 int min = t.length();
 StringBuilder a = new StringBuilder(s);
 StringBuilder b = new StringBuilder(t);