java - writing program in eclipse causes errors in command prompt -


so i'm writing program class , needs runnable via command prompt. ie javac filename.java java filename. wrote code in eclipse why i'm having trouble. code follows:

    import javax.swing.japplet;     import javax.swing.jbutton;      import java.awt.event.actionevent;     import java.awt.event.actionlistener;     import javax.swing.jlabel;     import javax.swing.swingconstants;     import com.jgoodies.forms.layout.formlayout;     import com.jgoodies.forms.layout.columnspec;     import com.jgoodies.forms.factories.formfactory;     import com.jgoodies.forms.layout.rowspec;     import java.awt.font;       public class qa extends japplet implements actionlistener{          int y=0;         int x=0;         int a=0;         int b=0;         static int q=-1;          jbutton btnyes = new jbutton("yes");         jbutton btnno = new jbutton("no");         static jlabel lblnewlabel = new jlabel("use buttons answer question: pizza?");          public qa() {              getcontentpane().setlayout(new formlayout(new columnspec[] {                     columnspec.decode("220px"),                     formfactory.unrelated_gap_colspec,                     columnspec.decode("220px"),},                 new rowspec[] {                     rowspec.decode("97px"),                     rowspec.decode("50px"),                     rowspec.decode("73px"),                     rowspec.decode("42px"),}));             btnyes.setfont(new font("tahoma", font.plain, 10));               getcontentpane().add(btnyes, "1, 4, right, fill");             btnyes.setactioncommand("yes");             btnyes.addactionlistener(this);             btnno.setfont(new font("tahoma", font.plain, 10));              getcontentpane().add(btnno, "3, 4, left, fill");             btnno.setactioncommand("no");             btnno.addactionlistener(this);              lblnewlabel.sethorizontalalignment(swingconstants.center);             getcontentpane().add(lblnewlabel, "1, 2, 3, 1, fill, fill");         }          public void actionperformed(actionevent evt) {             object cmd = evt.getactioncommand();             if (cmd == "yes")             {                 ++q;             }             else if (cmd == "no")             {                 ++q;         }     } } }

the errors along lines of:

    c:\users\*****\desktop>javac qa.java     qa.java:8: error: package com.jgoodies.forms.layout not exist     import com.jgoodies.forms.layout.formlayout;                                     ^     qa.java:9: error: package com.jgoodies.forms.layout not exist     import com.jgoodies.forms.layout.columnspec;                                     ^     qa.java:10: error: package com.jgoodies.forms.factories not exist     import com.jgoodies.forms.factories.formfactory;                                        ^     qa.java:11: error: package com.jgoodies.forms.layout not exist     import com.jgoodies.forms.layout.rowspec;                                     ^     qa.java:32: error: cannot find symbol                     getcontentpane().setlayout(new formlayout(new columnspec[] {                                                    ^       symbol:   class formlayout       location: class qa     qa.java:32: error: cannot find symbol                     getcontentpane().setlayout(new formlayout(new columnspec[] {                                                                   ^       symbol:   class columnspec       location: class qa     qa.java:33: error: cannot find symbol                                     columnspec.decode("220px"),                                     ^       symbol:   variable columnspec       location: class qa     qa.java:34: error: cannot find symbol                                     formfactory.unrelated_gap_colspec,                                     ^       symbol:   variable formfactory       location: class qa     qa.java:35: error: cannot find symbol                                     columnspec.decode("220px"),},                                     ^       symbol:   variable columnspec       location: class qa     qa.java:36: error: cannot find symbol                             new rowspec[] {                                 ^       symbol:   class rowspec       location: class qa     qa.java:37: error: cannot find symbol                                     rowspec.decode("97px"),                                     ^       symbol:   variable rowspec       location: class qa     qa.java:38: error: cannot find symbol                                     rowspec.decode("50px"),                                     ^       symbol:   variable rowspec       location: class qa     qa.java:39: error: cannot find symbol                                     rowspec.decode("73px"),                                     ^       symbol:   variable rowspec       location: class qa     qa.java:40: error: cannot find symbol                                     rowspec.decode("42px"),}));                                     ^       symbol:   variable rowspec       location: class qa     14 errors

is there can do? help!

you're missing jgoodies forms jar classpath. can download here

to compile:

javac .;forms-1.2.1.jar qa.java

to run:

appletviewer my-qa-test.html

where html document contains applet tag

<applet code="qa.class" width=400 height=75 arhive="forms-1.2.1.jar"> </applet>

aside: when comparing string contents, use string#equals == operator compares object references. in case apply separation of concerns using anonymous actionlistener classes:

btnyes.addactionlistener(new actionlistener() {      @override     public void actionperformed(actionevent e) {        q++;     } });

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