[Training Video - 3] [Groovy in Detail] Non-static and Static functions, initializing log inside class

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log.info "starting"
 
// we use class to create  objects of a class
Planet p1 = new Planet()
Planet p2 = new Planet()
 
//Planet.name = "Pluto"  illegal
Planet.shape = "Circle"    // static variable
Planet.log = log
 
p1.name = "earth"  // non static variable
p2.name = "jupiter"
 
p1.printName()   // non static has to be called with reference
Planet.revolve()  // static can be called with class
 
class Planet{
// variables and functions
    def name    // non static variable
    def static shape  // static variable
    def static log
 
    public void printName(){   // non static function
        log.info ("Name of planet is $name. Shape is $shape")
        xyz()  // non static can access static
    }
 
    public static void revolve(){  // static function
        //log.info (name)    // error, static cannot access non static
        xyz()  // call one function from another function
        log.info ("Planet revolving. Shape is $shape")
    }
 
    public static void xyz(){
        log.info "inside xyz"
    }
}

 Test Result:

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Tue Oct 06 18:30:29 CST 2015:INFO:starting
Tue Oct 06 18:30:29 CST 2015:INFO:Name of planet is earth. Shape is Circle
Tue Oct 06 18:30:29 CST 2015:INFO:inside xyz
Tue Oct 06 18:30:29 CST 2015:INFO:inside xyz
Tue Oct 06 18:30:29 CST 2015:INFO:Planet revolving. Shape is Circle

 Note :

Static cannot access non static

posted on   张缤分  阅读(264)  评论(0编辑  收藏  举报

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