java - ArrayList Index Error -
i trying finish project uses graphical user interface search through data base of geysers in us. keep getting error 1 of array lists. include data program is 10,000 entries long. appreciated. being done in bluej
error : java.lang.indexoutofboundsexception: index: 0, size: 0
database code:
import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.*; import java.util.arraylist; import java.util.scanner; public class geyserdatabase { private arraylist < geyser > geysers; private arraylist < eruption > eruptions; public geyserdatabase() { geysers = new arraylist < geyser >(); eruptions = new arraylist < eruption >(); } public void readgeyserdata(string filename){ try{ file f = new file(filename); scanner sc = new scanner(f); string text; // keep reading long there more data while(sc.hasnext()) { text = sc.nextline(); eruption e = new eruption(text); eruptions.add(e); } sc.close(); } catch(ioexception e) { system.out.println("failed read data file: " + filename); } creategeyserlist(); } public void adderuption (eruption e){ eruptions.add(e); } public arraylist <eruption> geteruptionlist(){ return eruptions; } public arraylist <geyser> getgeyserlist(){ return geysers; } public int getnumeruptions() { return eruptions.size(); } public int getnumeruptions(int m,int d,int y) { int count = 0; ( eruption e : eruptions) { if (e.getmonth()==m && e.getday()==d && e.getyear()==y) { count++; } } return count; } public eruption getlatenighteruption() { eruption latesteruption = eruptions.get(0); int latesthour = latesteruption.gethour(); int latestminute = latesteruption.getminute(); ( eruption e: eruptions ) { if (e.gethour() > latesthour || (e.gethour()==latesthour && e.getminute()>latestminute)) { latesteruption = e; latesthour = e.gethour(); latestminute = e.getminute(); } } return latesteruption; } public arraylist < eruption > geteruptions(string geyser) { arraylist < eruption > result = new arraylist < eruption > (); ( eruption e: eruptions ) { if (e.getgeysername().startswith(geyser)) { result.add(e); } } return result; } private void creategeyserlist(){ arraylist<string>namelist = new arraylist<string>(); // create temporary list of unique geyser names for(eruption e:eruptions){ if(!namelist.contains(e.getgeysername())){ namelist.add(e.getgeysername()); } } // create list of geysers arraylist<geyser>geyserlist = new arraylist<geyser>(); for(string s:namelist){ geyser g = new geyser(s); // count number of eruptions current geyser name for(eruption e:eruptions){ if(e.getgeysername().equals(g.getname())) g.increment(); } geyserlist.add(g); } } public int getmostgeysers(){ return geysers.size(); } public geyser findmostactivegeyser(){ geyser mosteruptions = geysers.get(0); int mostactive = mosteruptions.getnumeruptions(); for( geyser g : geysers){ if(g.getnumeruptions() > mostactive){ mosteruptions =g; mostactive = g.getnumeruptions(); } } return mosteruptions; } public geyser findleastactivegeyser() { geyser leastactivegeyser = geysers.get(0); int leastactive = leastactivegeyser.getnumeruptions(); for(geyser g: geysers) { if(g.getnumeruptions() < leastactive) { leastactivegeyser = g; leastactive = g.getnumeruptions(); } } return leastactivegeyser; } public string finddaywithmosteruptions(int y){ int daymost = 1; int monthmost = 1; int maxsofar = getnumeruptions(1,1,y); for(int m = 1; m<=12; m++){ for(int d = 1; d<=31;d++){ int eruptionsday = getnumeruptions(m,d,y); if(eruptionsday>maxsofar){ daymost = d; monthmost = m; maxsofar=eruptionsday; } } } return monthmost + "/" + daymost + "/" + y + "eruptions: " + maxsofar; } public static void main(string args[]){ geyserdatabase gdb = new geyserdatabase(); } } gui code:
import javax.swing.*; import java.awt.event.*; import java.awt.*; import java.util.*; import java.io.*; import java.text.*; /*********************************************************************** * gui front end yellowstone geyser database * * @author scott grissom * @version august 1, 2016 public class geysergui extends jframe implements actionlistener{ /** results box */ private jtextarea resultsarea; private geyserdatabase db; /**jbuttons */ private jbutton findlatenighteruption; private jbutton findamountoferuptionsondate; private jbutton findmaxeruptionsinyear; private jbutton findgeyserbyname; private jbutton findmostactivegeyser; private jbutton findleastactivegeyser; private jbutton getgeyserlist; private jtextfield month; private jtextfield day; private jtextfield year; private jtextfield geyser; /** menu items */ private jmenubar menus; private jmenu filemenu; private jmenu reportsmenu; private jmenuitem quititem; private jmenuitem openitem; private jmenuitem countitem; private jmenuitem geyseritem; /********************************************************************* main method *********************************************************************/ public static void main(string arg[]){ geysergui gui = new geysergui(); gui.setdefaultcloseoperation(jframe.exit_on_close); gui.settitle("yellowstone geysers"); gui.pack(); gui.setvisible(true); } /********************************************************************* constructor - instantiates , displays of gui commponents *********************************************************************/ public geysergui(){ db = new geyserdatabase(); // fix me: following line should removed db.readgeyserdata("geyserdata.txt"); // create gridbag layout setlayout(new gridbaglayout()); gridbagconstraints position = new gridbagconstraints(); // create results text area (5 x 10 cells) resultsarea = new jtextarea(20,40); jscrollpane scrollpane = new jscrollpane(resultsarea); position.gridx = 0; position.gridy = 0; position.gridheight = 10; position.gridwidth = 5; position.insets = new insets(20,20,0,0); add(scrollpane, position); /*******************************************************/ position = new gridbagconstraints(); position.insets = new insets(0,20,0,0); position.gridx = 0; position.gridy = 10; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; add(new jlabel("month"), position); position = new gridbagconstraints(); position.gridx = 0; position.gridy = 11; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; position.insets = new insets(0,20,0,0); month = new jtextfield(2); add(month, position); /*************************************************************/ position = new gridbagconstraints(); position.insets = new insets(0,20,0,0); position.gridx = 1; position.gridy = 10; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; add(new jlabel("day"), position); position = new gridbagconstraints(); position.gridx = 1; position.gridy = 11; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; position.insets = new insets(0,20,0,0); day = new jtextfield(2); add(day, position); /**********************************************************/ position = new gridbagconstraints(); position.insets = new insets(0,20,0,0); position.gridx = 2; position.gridy = 10; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; add(new jlabel("year"), position); position = new gridbagconstraints(); position.gridx = 2; position.gridy = 11; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; position.insets = new insets(0,20,0,0); year = new jtextfield(4); add(year, position); /**********************************************************/ position = new gridbagconstraints(); position.insets = new insets(0,20,0,0); position.gridx = 3; position.gridy = 10; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; add(new jlabel("geyser"), position); position = new gridbagconstraints(); position.gridx = 3; position.gridy = 11; position.gridwidth = 1; position.gridheight = 1; position.anchor = gridbagconstraints.line_start; position.insets = new insets(0,20,0,0); geyser = new jtextfield(12); add(geyser, position); /*********************************************************/ position = new gridbagconstraints(); position.insets = new insets(30,5,5,5); position.gridx = 6; position.gridy = 0; position.gridwidth = 1; position.gridheight = 1; add(new jlabel("eruptions"), position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 1; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findlatenighteruption = new jbutton("late night eruption"); findlatenighteruption.addactionlistener(this); add(findlatenighteruption, position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 2; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findamountoferuptionsondate = new jbutton("# on date"); findamountoferuptionsondate.addactionlistener(this); add(findamountoferuptionsondate, position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 3; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findmaxeruptionsinyear = new jbutton("max eruptions in year"); findmaxeruptionsinyear.addactionlistener(this); add(findmaxeruptionsinyear, position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 4; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findgeyserbyname = new jbutton("by name"); findgeyserbyname.addactionlistener(this); add(findgeyserbyname, position); position = new gridbagconstraints(); position.insets = new insets(30,5,5,5); position.gridx = 6; position.gridy = 5; position.gridwidth = 1; position.gridheight = 1; add(new jlabel("geysers"), position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 6; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findmostactivegeyser = new jbutton("most active"); findmostactivegeyser.addactionlistener(this); add(findmostactivegeyser, position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 7; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); findleastactivegeyser = new jbutton("least active"); findleastactivegeyser.addactionlistener(this); add(findleastactivegeyser, position); position = new gridbagconstraints(); position.gridx = 6; position.gridy = 8; position.gridwidth = 1; position.gridheight = 1; position.insets = new insets(0,5,5,5); getgeyserlist = new jbutton("geyser list"); getgeyserlist.addactionlistener(this); add(getgeyserlist, position); // set file menus setupmenus(); pack(); } /********************************************************************* list entries given arraylist of eruptions. include final line number of eruptions listed @param m list of eruptions *********************************************************************/ private void displayeruptions(arraylist <eruption> m){ resultsarea.settext(""); for(eruption e: m){ resultsarea.append("\n" + e.tostring()); } resultsarea.append ("\nnumber of geysers: " + m.size()); } /********************************************************************* respond menu selections , button clicks @param e button or menu item selected *********************************************************************/ public void actionperformed(actionevent e){ eruption item = null; // either open file or warn user if (e.getsource() == openitem){ openfile(); }else if(db.getnumeruptions() == 0){ string errormessage = "did forget open file?"; resultsarea.settext(errormessage); return; } // menu item - quit else if (e.getsource() == quititem){ system.exit(1); } // fix me: count menu item - display number of eruptions , geysers else if (e.getsource() == countitem){ resultsarea.settext("\nnumber of eruptions: " + db.getnumeruptions()); } // fix me: display late night eruption else if (e.getsource() == findlatenighteruption){ resultsarea.settext("latest eruption\n" + db.getlatenighteruption()); } //fix me: display geyser names else if (e.getsource() == getgeyserlist){ displayeruptions(db.geteruptionlist()); } //fix me: max eruptions day in year (check year) else if(e.getsource() == findmaxeruptionsinyear){ string aux = year.gettext(); if(aux.length() == 0){ joptionpane.showmessagedialog(this, "enter year search maax eruptions"); } else { int y = integer.parseint(year.gettext()); string result = db.finddaywithmosteruptions(y); resultsarea.settext(result); } } // fix me: list eruptions geyser (check name) else if(e.getsource() == findgeyserbyname){ string name = geyser.gettext(); if(name.length() == 0){ joptionpane.showmessagedialog(this, "provide name"); } else { arraylist<eruption>result = db.geteruptions(name); displayeruptions(result); } } // fix me: display eruptions particular date else if(e.getsource()==findamountoferuptionsondate){ string aux1 = year.gettext(); string aux2 = month.gettext(); string aux3 = day.gettext(); if(aux1.length() == 0 || aux2.length() == 0 || aux3.length() == 0) { joptionpane.showmessagedialog(this, "provide year,month, , day"); } else { int y = integer.parseint(year.gettext()); int m = integer.parseint(month.gettext()); int d = integer.parseint(day.gettext()); int result = db.getnumeruptions(m, d, y); resultsarea.settext("number of eruptions: " + result); } } else if(e.getsource() == findmostactivegeyser){ resultsarea.settext("most active geyser: " + db.findmostactivegeyser()); } else if(e.getsource() == findleastactivegeyser){ resultsarea.settext("least active geyser: " + db.findleastactivegeyser()); } } /********************************************************************* in response menu selection - open data file *********************************************************************/ private void openfile(){ jfilechooser fc = new jfilechooser(new file(system.getproperty("user.dir"))); int returnval = fc.showopendialog(this); // did user select file? if (returnval == jfilechooser.approve_option) { string filename = fc.getselectedfile().getname(); // use name of lottery ticket variable db.readgeyserdata(filename); } } /********************************************************************* create custom gridbag constraint *********************************************************************/ private gridbagconstraints makeconstraints(int x, int y, int h, int w, int align){ gridbagconstraints rtn = new gridbagconstraints(); rtn.gridx = x; rtn.gridy = y; rtn.gridheight = h; rtn.gridwidth = w; // set alignment: line_start, center, line_end rtn.anchor = align; return rtn; } /********************************************************************* set menu items *********************************************************************/ private void setupmenus(){ // create menu components filemenu = new jmenu("file"); quititem = new jmenuitem("quit"); openitem = new jmenuitem("open..."); reportsmenu = new jmenu("reports"); countitem = new jmenuitem("counts"); // assign action listeners quititem.addactionlistener(this); openitem.addactionlistener(this); countitem.addactionlistener(this); // display menu components filemenu.add(openitem); filemenu.add(quititem); reportsmenu.add(countitem); menus = new jmenubar(); menus.add(filemenu); menus.add(reportsmenu); setjmenubar(menus); } } geyser code:
import java.util.scanner; public class geyser { string geysername; int count = 0; public geyser (string name){ geysername = name; } public void increment (){ count++; } public string getname() { return geysername; } public int getnumeruptions() { return count; } public static void main(string args[]) { geyser g = new geyser("xyz"); if (g.getname().equals("xyz")) { system.out.println("getname worked well."); } else { system.out.println("getname did not work well."); } if (g.getnumeruptions() == 0) { system.out.println("getnumeruptions worked well."); } else { system.out.println("getnumeruptions did not work well."); } g.increment(); if (g.getnumeruptions() == 1) { system.out.println("getnumeruptions worked well."); } else { system.out.println("getnumeruptions did not work well."); } } } eruption code:
import java.util.scanner; public class eruption { int month; int day; int year; int hour; int minute; string geysername; public eruption(string info){ scanner scnr = new scanner(info); scnr.usedelimiter("/|,|:"); month = scnr.nextint(); day = scnr.nextint(); year = scnr.nextint(); geysername = scnr.next(); hour = scnr.nextint(); minute = scnr.nextint(); } public int getmonth(){ return month; } public int getday(){ return day; } public int getyear(){ return year; } public int gethour(){ return hour; } public int getminute(){ return minute; } public string getgeysername(){ return geysername; } public string tostring( ){ string geyserstring = geysername + " " + "on" + month +"/"+ day +"/" + year + "at" + hour +":"+ minute; return geyserstring; } public static void main(string [] args){ eruption e = new eruption("1/2/2016,old faithful,10:46"); if (e.getmonth() == 1) { system.out.println("getmonth worked well"); } } }
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