Many of the early sewing machines were powered by a treadle mechanism. The treadle was operated by pressing down on it with a foot, or both feet, to cause a rocking movement. This movement spins a large wheel on the treadle frame, connected by a thin leather belt to a smaller driving wheels on the sewing machine.
null. adj. 1. Having no legal force; invalid: render a contract null and void.2.ull. adj. 1. Having no legal force; invalid: render a contract null and void. 2.
in java the nullpointerexception is a public class that extends the runtimeexcpetion the nullpointerexception error is thrown in java application or applet when you try to use a null objectxception in thread main java lang nullpointerexception at test package exception example main exception example java 6 20 exception in thread main java lang nullpointerexception at test package exception example main exception example java 6