StromanStroman's solution

[stroman]

It's done in java,showing below.
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public String convert(String sourceString,int rows) {
        if (rows < 1 || sourceString == null) {
            System.out.println("输入非法");
            return "";
        }
        StringBuilder resultBuilder = new StringBuilder();
        for (int counter = 0;counter < rows;counter++) {
            if (rows == 1) {
                for (int counter0 = counter;counter0 < sourceString.length();counter0++) {
                    resultBuilder.append(sourceString.charAt(counter0));
                }
            } else if (rows >= sourceString.length()) {
                for (int counter0 = counter;counter0 < sourceString.length();counter0++) {
                    resultBuilder.append(sourceString.charAt(counter0));
                }
                break;
            } else {
                int stepLength = 2 * rows - 2 - 2 * counter;
                int counter0 = counter;
                while (counter0 < sourceString.length()) {
                    resultBuilder.append(sourceString.charAt(counter0));
                    if (stepLength != 2 * rows - 2 && stepLength != 0) {
                        counter0 += stepLength;
                        stepLength = 2 * rows - 2 - stepLength;
                    }
                    else if (stepLength == 0) {
                        stepLength = 2 * rows - 2;
                        counter0 += stepLength;
                    } else {
                        counter0 += stepLength;
                    }
                }
            }
        }
        return resultBuilder.toString();
    }