public void setPrev(Line prev) {
		if(prev instanceof CFLine)
		{
			setPrev((CFLine) prev);
		}
		
		else this.prev = prev;
	}
public void setPrev ( Line prev ) { if ( prev instanceof CFLine ) { setPrev ( ( CFLine ) prev ) ; } else this . prev = prev ; }
Sets the previous line which makes up the multiline which this line is a part of.
If prev is a CFLine, automatically connect the other line to this line as well.