java - Attempting to write code for a simple calculator. Trouble displaying text in textbox when user presses a button -

towards end of code write if commands using getactioncommand see button user presses. want make whatever user presses added textbox can see entering. reason whatever number press first seems show rest of numbers thereafter. how can fix this?

//michael moradi //period c1 //june 2, 2015 //final project semester 2  import javax.swing.*; //imports needed code  import java.awt.*; import java.awt.event.*;  public class calculator extends jframe implements actionlistener {      public jbutton button1, button2, button3, button4, button5, button6, button7,                     button8, button9, button10, button11, button12, button13, button14,                     button15, button16;     public jtextarea text;      public calculator()     {         setsize(350,300); //sets size 300 300 //look how lock size         setresizable(false); //does not let user change size of window         setdefaultcloseoperation(exit_on_close);//makes app close when press x on top left          container contentpane = getcontentpane();//gets contentpane         contentpane.setbackground(color.cyan);//sets background color white                   contentpane.setlayout(new flowlayout());//makes contentpane read left right          text = new jtextarea(1, 25);         contentpane.add(text);         text.seteditable(false);          button1 = new jbutton ("7");         contentpane.add(button1);         button1.addactionlistener(this);          button2 = new jbutton ("8");         contentpane.add(button2);         button2.addactionlistener(this);          button3 = new jbutton ("9");         contentpane.add(button3);         button3.addactionlistener(this);          button4 = new jbutton ("÷");         contentpane.add(button4);         button4.addactionlistener(this);          button5 = new jbutton ("4");         contentpane.add(button5);         button5.addactionlistener(this);          button6 = new jbutton ("5");         contentpane.add(button6);         button6.addactionlistener(this);          button7 = new jbutton ("6");         contentpane.add(button7);         button7.addactionlistener(this);          button8 = new jbutton ("x");         contentpane.add(button8);         button8.addactionlistener(this);          button9 = new jbutton ("1");         contentpane.add(button9);         button9.addactionlistener(this);          button10 = new jbutton ("2");         contentpane.add(button10);         button10.addactionlistener(this);          button11 = new jbutton ("3");         contentpane.add(button11);         button11.addactionlistener(this);          button12 = new jbutton ("-");         contentpane.add(button12);         button12.addactionlistener(this);          button13 = new jbutton ("0");         contentpane.add(button13);         button13.addactionlistener(this);          button14 = new jbutton (".");         contentpane.add(button14);         button14.addactionlistener(this);          button15 = new jbutton ("=");         contentpane.add(button15);         button15.addactionlistener(this);          button16 = new jbutton ("+");         contentpane.add(button16);         button16.addactionlistener(this);        }      public static void main(string[] args)     {         calculator guiwindow = new calculator(); //uses gui         guiwindow.setvisible(true); //makes visible      }      public void actionperformed(actionevent e)     {         container contentpane = getcontentpane();          string enterednumbers = text.gettext();          if (e.getactioncommand().equals("7"));         text.settext(enterednumbers + ("7"));          if (e.getactioncommand().equals("8"));         text.settext(enterednumbers + ("8"));          if (e.getactioncommand().equals("9"));         text.settext(enterednumbers + ("9"));          if (e.getactioncommand().equals("÷"));         text.settext(enterednumbers + ("÷"));          if (e.getactioncommand().equals("4"));         text.settext(enterednumbers + ("4"));          if (e.getactioncommand().equals("5"));         text.settext(enterednumbers + ("5"));          if (e.getactioncommand().equals("6"));         text.settext(enterednumbers + ("6"));          if (e.getactioncommand().equals("x"));         text.settext(enterednumbers + ("x"));          if (e.getactioncommand().equals("1"));         text.settext(enterednumbers + ("1"));          if (e.getactioncommand().equals("2"));         text.settext(enterednumbers + ("2"));          if (e.getactioncommand().equals("3"));         text.settext(enterednumbers + ("3"));          if (e.getactioncommand().equals("-"));         text.settext(enterednumbers + ("-"));          if (e.getactioncommand().equals("0"));         text.settext(enterednumbers + ("0"));          if (e.getactioncommand().equals("."));         text.settext(enterednumbers + ("."));          if (e.getactioncommand().equals("="));         text.settext(enterednumbers + ("="));          if (e.getactioncommand().equals("+"));         text.settext(enterednumbers + ("+"));        }  } 

you have semicolons directly after each if-statement. semicolon empty statement, cause if statement needn't semicolon @ end. empty statement (just semicolon) nothing , completes normaly without error.

now empty statement @ end of if statement means, if expression of if statement evaluates true, nothing done , next statement executed whether or not if statement returns true.

so instead of

if (e.getactioncommand().equals("7"));     text.settext(enterednumbers + ("7")); 

use this

if (e.getactioncommand().equals("7"))     text.settext(enterednumbers + ("7"));