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Error: please define the main method as: public static void main(String args) January 10    4

While Executing below program I'm getting error message as "Error: Main method not found in class Parent_Package.Parent, please define the main method as: public static void main(String[] args)".................. Can any one know how to resolve

What does String args contain in java January 10    6

When I run the following program:public class Test { public static void main(String[] args) { System.out.println(args); } { It prints: [Ljava.lang.String;@153c375and when I run it again, it prints: [Ljava.lang.String;@1d1e730it gives me different out

What is the fastest way to navigate to a project by its name in Eclipse or STS January 10    1

I have a workspace with 100+ projects in Spring Tool Suite. It is becoming very clustered and hard to find what I want. I often use CMD + Shift + R and CMD + Shift + T for opening a file by its name, but I don't remember all of them by heart.I am in

Shortcut to get rid of full class names January 10    2

I have a lot of lines of code that are similar to this:objectListPanel = new javax.swing.JPanel(); roomNameField = new javax.swing.JTextField(); rightPanel = new javax.swing.JPanel(); jTabbedPane = new javax.swing.JTabbedPane(); enterScriptPanel = ne

A shortcut to select a line in Eclipse January 10    8

is there a keyboard shortcut to select all the line your cursor is currently on? In Eclipse? Or even in general on Windows/Linux?Thanks in advance.8 AnswersSolution for Eclipse:Hold Alt and ...

Toggle comments in FDT January 10    1

Is there a way to do the shortcut commenting described in this question, in FDT when doing Action Script 3 coding?That is, something like Ctrl + / to comment or uncomment one or more lines.1 AnswersI discovered the answer after looking at this FDT sh

Shortcut for comment Ctrl+7 in eclipse doesn t work January 10    1

I use Eclipse for PHP Developers ( Helios SR2) in Mac OS X. I'm used to use Cmd + 7 in Windows, for Java. Here it doesn't work ( The equivalent Apple + 7) I went to preferences > General > Key, and try to change shortcut. I have 5 lines about Add Co

Uncomment multiline code in eclipse January 10    2

Yes, this could be duplicate of Eclipse comment/uncomment shortcut? But, answers given their are not working for my case.I have formatted java code and When I select and use ctrl + shift + / it looks like /* * if (isKilled) { Log.i("TAG", "

Shortcut keys for java or eclipse notes duplicate January 10    3

This question already has an answer here: Eclipse comment/uncomment shortcut? 15 answers Hello I needed to know how do I uncomment out code in eclipse? I know Crtl+Shift+C will comment out a set of code how do I undo that?3 AnswersHere You have all s

Base and Derived class constructor polymorphism woes January 10    2

Sorry for the vague title.I'm writing a set of classes, and im having trouble thinking of an intuitive way of breaking up what is done in the base constructor and what is done in the derived constructor.My problem is as follows:All classes require st

why can't I call a subclass method using a reference of a parent type that refers to an instance of a sub-type January 10    5

I am Learning Java, while trying to understand inheritance. I couldn't figure out why the overridden method at the subclass walk() executed but not the other xyz() method. class Person{ publ ...

Incompatible return type for subclasses in Requirements in Overriding and Hiding of JLS January 10

quoting from JLSIf a method declaration d1 with return type R1 overrides or hides the declaration of another method d2 with return type R2, then d1 must be return-type substitutable for d2, or a compile-time error occurs. Furthermore, if R1 is not a

Multi-level Inheritance January 10    1

I am having following classespublic class InheritTest{ Parent p = new Child(); Child c = (Child)p; void someMethod(){ System.out.println(p.getX()+" "+c.getX()); } public static void main (String [] args){ InheritTest it = new InheritTest(); it.s

Polymorphism on member variables. I know it is not possible, I don't understand this specific case January 10    3

I know the behavior, but I am not 100% sure on why this occurs.I understand that there is no polymorphism for instance variables in java. The variables are resolved statically by the compiler.But in the following I am confused on something: class Ani

Initialize member variables in the beginning of class definition or in constructor January 10    4

What is the difference between defining and initialising the member variables in the beginning of the class definition, and defining the member variables first and initialising the member variables in the constructor?Say, for example: public class Te

Is there any way to initialize member variables of a subclass in Java before the superclass' constructor is called January 10    5

I need this because the constructor in the superclass is calling a method which is overridden in the subclass. The method returns a value which is passed to the subclass' constructor. But the superclass constructor must be called before the subclass

Object oriented design with Javacasting and a derived class with more member variables than the base January 10    4

I have a base class, let's call it DispenseResult that stores the result of a machine operation. I am designing for a family of machines. DispenseResult will contain member variables that are applicable to all machines, such as current drawn during a

Calling Overridden method from derived class January 10    2

I have two objects derived from an Account class stored in an ArrayList. I am trying to call overridden methods with a basic for loop but I can't get it to work consistently.import java.util.ArrayList; import java.util.Scanner; public class Inheritan

How to compare derived class object with Base class object java January 10    2

How do I compare Base class object with derived class object in derived class? I need to get true as output from the code below:class Base { int i; String str; } class Derived extends Base{ double d; String str1; public static void main(String []a){

When called on a derived class, have a generic method defined in base class return derived class type in Java January 10    3

I have a utility class for interacting with the Datastore (GAE's in-built Datastore in my case) and it has methods like://Class GaeDataUtil public static <T> Optional<Key<T>&g ...