java - Writing to a text file past a particular string -

i'm looking way write text file searching particular string , writing past it. mean want separate text file 2 sections, can write each section separate java programs. reason i'm running tests 2 different java programs , storing results in 2 text files @ moment, have them both write same place, in different sections. here code using write understand may need change in order want do.

try {     dateformat dateformat = new simpledateformat("yyyy/mm/dd hh:mm:ss");     calendar cal = calendar.getinstance();     string content = dateformat.format(cal.gettime()) + " test took: " + test3 + " seconds.";      file file = new file("mypath\\test.txt");      if (!file.exists()) {         file.createnewfile();     }      filewriter fw = new filewriter("mypath\\test.txt",true);     bufferedwriter bw = new bufferedwriter(fw);     fw.write("\r\n");     bw.write(content);     fw.write("\r\n");     bw.close();      system.out.println("done");  } catch (ioexception e) {         e.printstacktrace(); } 

it stores results of each test, separated 1 line. i'm hoping put 2 sections same text file, , able add end of each independently. possible? , if how go doing that?

as long 2 java programs not writing file at same time, 1 way can have 2 programs write different parts of file.

each program create instance of class, , call appropriate methods program (either 1st program or 2nd program).

package com.ggl.testing;  import java.io.file; import java.util.arraylist; import java.util.list;  public class twopartfile {      private string partoneheader;      private list<string> partone;      private string parttwoheader;      private list<string> parttwo;      public twopartfile(string partoneheader, string parttwoheader) {         this.partoneheader = partoneheader;         this.partone = new arraylist<>();         this.parttwoheader = parttwoheader;         this.parttwo = new arraylist<>();     }      public twopartfile(file file, string partoneheader, string parttwoheader) {         readfile(file, partoneheader, parttwoheader);     }      public void readfile(file file, string partoneheader, string parttwoheader) {         // todo write code read file , separate components.     }      public void writefile(file file) {         // todo write code write file components     }      public list<string> getpartone() {         return partone;     }      public void setpartone(list<string> partone) {         this.partone = partone;     }      public list<string> getparttwo() {         return parttwo;     }      public void setparttwo(list<string> parttwo) {         this.parttwo = parttwo;     }      public string getpartoneheader() {         return partoneheader;     }      public string getparttwoheader() {         return parttwoheader;     }  }