how to access private variables from another class in java

();//the Tell method is available.//c.speak ();//error, private method of parent class is not visible }}We can see that the Tell method is still available in the test class, even if the property of the child class object is not assigned a value. If the child class does n

Code PackageCom.qhong; Public classMainextendsBImplementsa{ Public Static voidMain (string[] args)throwsException {NewMain (). Action ();; } Public voidaction () {System.out.println (Super. x); System.out.println (a.x); //System.out.print (x); }}Interfacea{intx = 0;//default is public static final}classb{intx = 1;}Output:10If the comment is canceled, the error:Error: (+) Java: Reference to x is ambiguous com.qhong.b

When multiple threads are interacting with an object, controls need to be in place to ensure that the threads don't adversely affect one another. this chapter deals with issues that can introduce subtle errors in your application. an application that fails to safely control concurrent access can work properly most of the time-maybe nearly all the time-but will occasionally produce erroneous results. this makes the understanding and disciplined use of

public classA {String s = "outer class member variable";//member Variables public voidMethod () {//member Methods FinalString S1 = "inner class variable";//Local Variables classInnerclass {//local inner class public voidInnermethod () {//loc

Yesterday I read a book titled 16 lessons to break through the basic skills of programmers. I personally think it is okay. I mainly gave some in-depth explanations on Java skills, this gives me a new understanding of class initialization and object creation. I. class initialization Class initialization:

your JAVA installation directory, my installation in the "C:\Program files\java\jdk1.8.0_25" this path. such asIs my Java installation directoryHere, Java's path path is already set.After you open the CMD console (Dos), you can open the Java binary executable program in any directory (for example: Java.exe,javac.exe);

"Error:implicit Super constructor Pet () is undefined. Must explicitly invoke another constructor "　Remember one point: when you construct a subclass, you are bound to call the constructor of the parent class. Because the elements in the parent class also need to be initialized.So the parent class either has a default parameterless construct, so

I. class initialization Class initialization: class initialization is generally only performed once, and class initialization is mainly used to initialize static member variables. Class compilation determines the

This article describes the variables and members of the PHP class in detail, and issues related to inheritance, access, and rewriting. If you need them, refer to them. This article describes the variables and members of the PHP class in detail, and issues related to inherita

.joingame (); System.out.println ("Total =" +child.total); }}//Define Child Classesclasschild{intAge ; String name; //Total is a static variable, so it can be accessed by any object Static intTotal=0; PublicChild (intage,string name) { This. age=Age ; This. name=name; } Public voidJoingame () { total++; System.out.println ("One of the children has joined."); }}2. What is a class method and why is there a

Imagine if you could easily invoke a private method of a class, would you say that your encapsulation is not valid? Recently looking at the reflection mechanism of Java, found that can use Java reflection mechanism to invoke other classes of private methods, as to what this

Public class Test1 { privateint t1 = 1; Public int getT1 () { return t1; } Public void setT1 (int t1) { this. T1 = t1; }} The above is the Test1 class, there is a private T1, the value is 1, gave the Get/set method. Public class extends Test1 { privateint t1 = 2; Public Static

One. Classes are as follows. public class calculator2{ private int Add (int a,int b) {return a+b; } } Second, in the same package another class is lowered using the method add as follows: public class Test {public static void Main (string[] args) { Calculator2 Calculator2 = new Calcula

Are class locks and object locks conflicting? are object locks and private locks conflicting? Explained by an instance. I. Relevant agreement To clarify the description of the following article, first of all the relevant definitions of the lock involved in this article are as follows: 1. Class Lock: A static and synchronized lock is added to the method in the

http://my.oschina.net/wangyumin/blog/387627The last reflection method calls the private member, and the method is recently encapsulated two times. Reflectutil.java Partial code slightly/** * Invoking method Plus * * @param object Java Object * @param methodName methods Name * @param args Entry Object * @return Execution Result Object */public static object Invokemethodplus (Object object, String METHODN

Class inout {string STR = new string ("between"); Public void amethod (final int iargs) {int it315 = 10; Class bicycle {public void sayhello () {system. out. println (STR); system. out. println (iargs); system. out. println (it315); // compilation error: inout. java: 13: local variable it315 is accessed from within inner clas