java代码实例第43课

test043.java

package pack02;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class test043
{

  public static void main(String[] args)
  {
    String content[]  = new String[] {"好久不见","最近好吗","常联系"};
    File file1 = new File("test.txt");
    if (file1.exists())
    {
      try
      {
        FileWriter writer1 = new FileWriter(file1);
        BufferedWriter bufferedWriter1 = new BufferedWriter(writer1);
        for (int i = 0; i < content.length; i++)
        {
          bufferedWriter1.write(content[i]);
          bufferedWriter1.newLine();
        }
        bufferedWriter1.close();
        writer1.close();
      } catch (Exception e)
      {
        e.printStackTrace();
      }
    }
    else 
    {
      test043.createFile();
    }

    try
    {
      FileReader reader1 = new FileReader(file1);
      BufferedReader bufferedReader1 = new BufferedReader(reader1);
      String str1 = null;
      int i = 0;
      while ((str1 = bufferedReader1.readLine()) != null)
      {
        i++;
        System.out.println("第" + i + "行：" + str1);
      }
      bufferedReader1.close();
      reader1.close();
    } catch (Exception e)
    {
      e.printStackTrace();
    }

  }

  public static void createFile()
  {
    File file1 = new File("test.txt");
    try
    {
      file1.createNewFile();
      System.out.println("文件已创建");
    } catch (Exception e)
    {
      e.printStackTrace();
    }
  }

}