Groovy 不在函数内打印字符串

Question

我是 groovy 的新手。我有以下代码，我想在控制台上打印字符串，但它不起作用：

import java.io.FileWriter;
import java.util.Arrays;
import java.io.Writer;
import java.util.List;

//Default separator
char SEPARATOR = ',';

//get path of csv file (creates new one if its not exists)
String csvFile = "c:";
println "========================= csvFile";
println csvFile;

String[] params = {"hello"};


writeLine(params, SEPARATOR);

//function write line in csv
public void writeLine(String[] params, char separator)
{
   boolean firstParam = true;
   println params;
   StringBuilder stringBuilder = new StringBuilder();
   String param = "";

   for (int i = 0; i < params.length; i++)
   {
      //get param
      param = params[i];
      println param;

         //if the first param in the line, separator is not needed
       if (!firstParam) 
       {
           stringBuilder.append(separator);
       }

         //Add param to line
       stringBuilder.append(param);

       firstParam = false;
   }

   //prepare file to next line
   stringBuilder.append("\n");
   //add to file the line
   println stringBuilder.toString();

}

它给出以下输出：

Answer 1

在 groovy 中声明数组你必须使用方括号：

String[] params = ["hello"]

顺便说一句，整个代码可以简化为：

String[] params = ["hello"]

def writeLine(params, separator=','){
    println params.join(separator)
}
writeLine(params)

Groovy 不在函数内打印字符串

Groovy doesn't print the string inside a function

groovy