Java to write the file

1. Overview

https://www.baeldung.com/java-write-to-file

 

 

BufferedWriter, PrintWriter, FileOutputStream, DataOutputStream, RandomAccessFile, FileChannel

 

 

 

public void whenWriteStringUsingBufferedWritter_thenCorrect()
  throws IOException
  {
  	String str="Hello";
    BufferedWriter writer  = new BufferedWrite(new FileWriter(fileName));
    writer.write(str);
    writer.close();
    
  }

 

The output in the file will be:

 

 

Hello

 

 

public void whenAppenStringUsingBufferedWriter_thenOldContentShouldExistTool()
throws IOException
{
	String str="World";
    BufferedWriter write = new BufferedWriter(new FileWriter(fileName,true));
    writer.append(" ");
    writer.append(str);
  
}