import java.io.*;

public class Write {
 public static void main(String[] args){
  try{
   BufferedWriter out=new BufferedWriter(new FileWriter("runoob.txt"));
   out.write("java");
   out.close();
   System.out.println("文件创造成功！");
  }catch(IOException e){
   
  }
 }
}

java文件写入