[Training Video

log.info "starting"
// we use class to create  objects of a class
Planet p1 = new Planet()
Planet p2 = new Planet()
Planet p3 = new Planet()

//Planet.name = "Pluto"  illegal
Planet.shape = "Circle" 

p1.name = "earth"
//p1.shape = "circle"

p2.name = "jupiter"
//p2.shape = "circle"

p3.name = "mars"
//p3.shape = "circle"

log.info p1.name+"  "+p1.shape
log.info p2.name+"  "+p2.shape
log.info p3.name+"  "+p3.shape

p1 = p2
log.info "*************************************"
log.info p1.name+"  "+p1.shape
log.info p2.name+"  "+p2.shape
log.info p3.name+"  "+p3.shape

p1.name = "pluto"
log.info "*************************************"
log.info p1.name+"  "+p1.shape    //pluto
log.info p2.name+"  "+p2.shape    //pluto
log.info p3.name+"  "+p3.shape

class Planet{
// variables and functions
	def name    // non static variable
	def static shape  // static variable
}

运行结果：

Tue Oct 06 16:27:27 CST 2015:INFO:starting
Tue Oct 06 16:27:27 CST 2015:INFO:earth  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:jupiter  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:mars  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:*************************************
Tue Oct 06 16:27:27 CST 2015:INFO:jupiter  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:jupiter  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:mars  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:*************************************
Tue Oct 06 16:27:27 CST 2015:INFO:pluto  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:pluto  Circle
Tue Oct 06 16:27:27 CST 2015:INFO:mars  Circle