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    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

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via Oracle Community by 807596, 1 year ago
java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:415) at java.lang.Integer.parseInt(Integer.java:497) at Lissajous.<init>(Lissajous.java:30) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at java.lang.Class.newInstance0(Class.java:340) at java.lang.Class.newInstance(Class.java:293) at sun.applet.AppletPanel.createApplet(AppletPanel.java:710) at sun.applet.AppletPanel.runLoader(AppletPanel.java:639) at sun.applet.AppletPanel.run(AppletPanel.java:319) at java.lang.Thread.run(Thread.java:595)