java - Arraylist of Objects - How do I remove an entry? -


i doing homework , states have able remove entry arraylist of objects.

i try check if contains user id want remove objects cannot contain strings

 public class employeeprogramview extends frameview {  arraylist <information> database = new arraylist <information>();   private void exitbuttonactionperformed(java.awt.event.actionevent evt) {                                                system.exit(0); }                                            private void addbuttonactionperformed(java.awt.event.actionevent evt) {                                               information a;     string id, firstname, lastname, startdate, annualsalary, linedup;     id = idinput.gettext();     firstname = firstnameinput.gettext();     lastname = lastnameinput.gettext();     startdate = startinput.gettext();     annualsalary = salaryinput.gettext();     linedup = (firstname+" "+lastname+" "+annualsalary+" "+startdate);      = new information (id, firstname, lastname, startdate,annualsalary);     database.add(a);      system.out.println(linedup); }                                           private void listbuttonactionperformed(java.awt.event.actionevent evt) {             string temp="";      (int x=0; x<=database.size()-1; x++) {         temp = temp + database.get(x).id + " "                 + database.get(x).first + " "                 + database.get(x).last + " "                 + database.get(x).start + " "                 + database.get(x).salary + "\n";     }     finaloutput.settext(temp);  }  private void removebuttonactionperformed(java.awt.event.actionevent evt) {     string removeid;     removeid = idinput.gettext();       if (database.contains(removeid)){     database.remove(removeid);      } else {     finaloutput.settext("no such id in database");     } }  class information{ string id, first, last, start, salary;      information(string _id ,string _first, string _last, string _start, string _salary){         id = _id;         first = _first;         last = _last;         start = _start;         salary = _salary;     } }

}

so question is? how remove object?

the remove method remove object array long .equals returns true when comparing object , object asking remove. true identical strings; other objects defaults equal (still, can add object array , retain variable referring it).

you can remove by array index.


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