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1. Top results related to what are the three basic structures of structured programming in java class

   • What are the disadvantages of using a static nested class in Java?

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     Answered Nov 06, 2012 · 5 votes

     Advantage: What the author meant was a static nested class gets compiled into a totally separate .class than the outer class enclosing it. So, if it bothers you or over complicates the things or confuses you then better use it separately. A Static nested class doesn't depend on the outer class instance, it can run on it's own. Even a main function can be written inside the static nested class and invoked directly. And the benefit of it is you can have less number of objects created at runtime which wouldn't be the case with other types of nested classes.

     Disadvantage The only disadvantage I can think of is a static nested class has access to both the protected and private members of the outer class. Say you have a class X and a class Y. In order for Y to access X's private members but not the rest of the world, making Y an Inner class of X helps. That satisfies the encapsulation thing by grouping them together.

     But a Static Nested class doesn't care about accessibility modifiers of the Outer class while accessing it's members. Since it can live independently, it can allow somebody from outer world to mingle with the private members of the Outer class and hence break the encapsulation.

     Treat the Static nested class as another top level class who can gain access to the private and protected members of the Outer class without using the Outer class's context/instance and freely sell them to external world for bad use.

     For better understanding about Nested classes or anything in Java, I would recommend going through the Oracle docs before reading any book, http://docs.oracle.com/javase/tutorial/java/javaOO/nested.html

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   • What are the different ways to load a class in Java

     Top Answer

     Answered Apr 21, 2013 · 17 votes

     I will start with the simplest (Here I assume the class definition is available in the classpath and JVM can load it) :

     SomeClass someInstance = null;-

     Class.forName("XYZ");-

     ClassLoader.getSystemClassLoader().loadClass("XYZ");-

     Class.forName(String name, boolean initialize, ClassLoader loader)-

     • Reference the class name in the code. The class will be loaded latest when the JVM finds that reference. SomeClass someInstance = null;
     • Class.forName(String), to load and initialize the class.It uses classloader of current class. Class.forName("XYZ");
     • ClassLoader#loadClass(String), to load class, but doesn't initialize.You can get an instance of ClassLoader and invoke loadClass() on that instance, which can be a Custom ClassLoader or System ClassLoader. ClassLoader.getSystemClassLoader().loadClass("XYZ");
     • Overloaded Class.forName() , allows you to specify the classloader to use explicitly and initialize parameter to specify whether the class must be initialzed. Class.forName(String name, boolean initialize, ClassLoader loader)

     For JDBC, we need to load the driver class as well as initialize it. Somewhere the driver class gets registered with the JDBC Driver Manager by running some static initializer(though I haven't seen the inner working code). Hence we need to use a class loading mechanism where the driver class gets loaded and its static initialization blocks run. Hence the most preferred way is Class.forName().

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   • What are the uses of inner classes in Java? Are nested classes and inner classes the same?

     Top Answer

     Answered Jun 20, 2020 · 13 votes

     No, they're not the same: an inner class is non-static.

     JLS 8.1.3 Inner Classes and Enclosing Instances

     An inner class is a nested class that is not explicitly or implicitly declared static.

     Consult also the following diagram from Joe Darcy:

     Joseph D. Darcy's Oracle Weblog - Nested, Inner, Member, and Top-Level Classes

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     • Java inner class and static nested class

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     3/5

   • what are the functions of JVM, What JVM does when we run “java A” , A is class

     Top Answer

     Answered Jun 24, 2014 · 1 votes

     JVM is too complex to describe here. There is an excellent resource written by one of it's creator in order to you can master JVM. The Java Virtual Machine

     In your case, When you type "java A", a new JVM is started and the "bootstrap class loader" is responsible for loading key Java classes like java.lang.Object and other runtime code into memory first. The runtime classes are packaged inside of the JRE/lib/rt.jar file. In a JVM, each and every class is loaded by some instance of a java.lang.ClassLoader. The ClassLoader class is located in the java.lang package and we are free to subclass it to add their own functionality to class loading.

     Learn more about class loaders from here: The basics of Java class loaders

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     4/5

   • What are the drawbacks of enums in Java?

     Top Answer

     Answered Jul 16, 2019 · 5 votes

     One possible answer is that enums were introduced in Java 1.5. While this seems like ancient history, some libraries still use string constants or numeric constants for compatibility reasons.

     Another possible answer is that those are not really semantically enum elements, but constants used by an external interface and are only ever accessed via their string value. In such cases, using enums and calling name() each time would be redundant.

     Other than that, you should never use enums over string constants in such cases.

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2. www.javatpoint.com › structure-of-java-programStructure of Java Program - Javatpoint

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   A typical structure of a Java program contains the following elements: Documentation Section. Package Declaration. Import Statements. Interface Section. Class Definition. Class Variables and Variables. Main Method Class. Methods and Behaviors. Documentation Section. The documentation section is an important section but optional for a Java program.

3. www.geeksforgeeks.org › structure-members-java-programStructure and Members of the Java Program - GeeksforGeeks

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   Mar 12, 2024 · Structure and Members of the Java Program. Last Updated : 12 Mar, 2024. When we are writing any program in any language, we need to follow a standard structure for writing the program which is recommended by the language experts. A Java program may contain many classes of which only one class will have a main method.

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4. People also ask

   What is a typical structure of a Java program?

   • A typical structure of a Java program contains the following elements: The documentation section is an important section but optional for a Java program. It includes basic information about a Java program. The information includes the author's name, date of creation, version, program name, company name, and description of the program.

   Structure of Java Program - Javatpoint

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   How many packages can a Java program have?

   • Note that there can be only one package statement in a Java program. It must be defined before any class and interface declaration. It is necessary because a Java class can be placed in different packages and directories based on the module they are used. For all these classes package belongs to a single parent directory.

   Structure of Java Program - Javatpoint

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   How many methods can a Java class have?

   • A method can be static or non-static. You can declare any number of methods in any order in the class. However, it’s a good practice to keep the number of methods and the method body as small as possible. So far, you have learned details about structure of a Java class with code examples.

   Java Basics: Java Class Structure Examples - CodeJava.net

   codejava.net/java-core/the-java-language/java-class-structure-examples

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   How many subclasses does a shape class allow?

   • Here, the Shape class permits exactly only 3 subclasses that are Rectangle, Circle and Triangle. These subclasses are known at compile time, and no other classes can extend the Shape class. 3. Class name The name of a class should follow general naming for identifiers in Java.

   Java Basics: Java Class Structure Examples - CodeJava.net

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5. www.w3schools.in › java › program-structureJava Program Structure - W3Schools

   www.w3schools.in › java › program-structure

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   Basic Structure of Java Programs. A Java program involves the following sections: Documentation Section. Package Statement. Import Statements. Interface Statement. Class Definition. Main Method Class. Main Method Definition. Here is an example of the Hello Java program to understand the class structure and features.

6. codejava.net › java-class-structure-examplesJava Basics: Java Class Structure Examples - CodeJava.net

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   • Complete structure of a Java class. The complete structure of a Java class is as follows: class className extends implements { Field Declarations Static Initializers Instance Initializers Constructors Method Declarations }
   • Class modifiers. A class should be preceded by one or more modifiersthat specify its visibility (public, protected, private, sealed) or characteristics (abstract, static, final, strictfp).
   • Class name. The name of a class should follow general naming for identifiers in Java. It should start with an upper case letter. It should not contain special characters ($, _, -, @...).
   • Extending a super class. A class can inherit public and protected members from another class via the extends keyword. In the above example, the RoundedCornerSquareclass extends the Squareclass

7. refreshjava.com › java › structure-of-java-programBasic Structure of Java Program with Example - RefreshJava

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   The basic components of a java program and their order of declaration is : Package Statement. Import Statement. Documentation or comment. Class Definition. Declare instance and static variables. Declare constructors (if any) Main method or other methods.

8. www.codecademy.com › article › java-program-structureJava Program Structure | Codecademy

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   Java programs have a specific structure in how the code is written. There are key elements that all Java programs share. The Program. We have the text of a program inside the file called HelloWorld.java. public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); }

9. www.thejavaprogrammer.com › structure-of-java-programBasic Structure of Java Program with Example - The Java ...

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   1. 2. package example; // where example is name of package. package root.example; // root is the parent directory of example. Documentation Section. It is also an optional section to write but it is important to write for better readability and understanding.