The third experiment and the hands-on brain

//The first one to move the brain Packagehands on the brain 3; Public classClassandobjecttest { Public Static voidMain (string[] args) {//create an instance of a class that defines an instance of an object variable referenceMyClass obj =NewMyClass (); //invoking the public method of a class through an object variableObj.mymethod ("Hello"); //Assigning a value to a propertyObj.setvalue (100); //the current value of the output propertySystem.out.println (Obj.getvalue ()); //direct access to object public fieldsObj.information = "Information"; //the current value of the Output object public fieldSystem.out.println (obj.information); }}/*** Examples of custom Java classes*/classMyClass {//Public Fields     PublicString information = ""; //Customizing Public Java instance Methods     Public voidMyMethod (String argu) {System.out.println (ARGU); }    //Define properties: Private field +get method +set method    Private intvalue;  Public intGetValue () {returnvalue; }     Public voidSetValue (intvalue) {         This. Value =value; }} Run as follows://The second one , the brain. Packagehands on the brain 3;classroot{Static{System.out.println ("Static initialization block of root"); } {System.out.println ("Root's normal initialization block"); }     PublicRoot () {System.out.println ("Root parameterless constructor"); }}classMidextendsroot{Static{System.out.println ("Static initialization block for mid"); } {System.out.println ("Normal initialization block for mid"); }     PublicMid () {System.out.println ("No parametric constructor for mid"); }     PublicMid (String msg) {//calling overloaded constructors in the same class through this         This(); System.out.println ("Mid with parametric constructor, its parameter value:" +msg); }}classLeafextendsmid{Static{System.out.println ("Static initialization block of the leaf"); } {System.out.println ("Plain initialization block of the leaf"); }         PublicLeaf () {//A constructor that invokes a string argument in the parent class through Super        Super("Java Initialization sequence Demo"); System.out.println ("The constructor that executes the leaf"); }} Public classteststaticinitializeblock{ Public Static voidMain (string[] args) {NewLeaf (); }} is as follows:

The third experiment and the hands-on brain