LeetCode 6. ZigZag Conversion

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P   A   H   N
A P L S I I G
Y   I   R
And then read line by line: "PAHNAPLSIIGYIR"

Write the code that will take a string and make this conversion given a number of rows:

string convert(string text, int nRows);

convert("PAYPALISHIRING", 3) should return "PAHNAPLSIIGYIR".

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public class Solution {
    public String convert(String s, int numRows) {
        char[] ss =s.toCharArray();
        if(numRows<=1){
            return s;
        }else if(numRows>=s.length()){
            return s;
        }else{
            StringBuffer result=new StringBuffer();
           
            int tap= 2*numRows-2;
            
            //先添加第一行的字符
            for(int i=0;i<s.length();i+=tap){ 
                result.append(ss[i]);
            }
            //然后添加中间行
            int temp = tap -2;
            
            for(int i=1;i<numRows-1;i++){
                for(int j=i;j<s.length();j+=tap)
                {
                    result.append(ss[j]);
                    if(j+temp<s.length()){
                        result.append(ss[j+temp]);
                    }
                }
                temp-=2;
            }
            
            //添加最后一行
            for(int i=numRows-1;i<s.length();i+=tap){
                result.append(ss[i]);
            }
            return result.toString();
        }
        
    }
}

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