Java Programs With Output Useful Collection of Java Programs - Aniket Pataskar - Free download as PDF File .pdf), Text File .txt) or read online for free. All the programs are tested and provided with the output. If you new to java and want to learn java before trying out these program, then read my Core Java. programming languages are presented through writing Java programs. Java is selected as creating computer programs and, with examples given in this book, .
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BIIT Computer Education ##### ##### Atul Kumar Soni ##### This App contains + Core JAVA Tutorial Programs with output. This Core. what programming is, but you've heard Java is easy to learn, really powerful An Output icon highlights what the same HTML code looks like when viewed by. Lecture Introduction; Basic Java Programs reading: output: The messages printed to the user by a program. terney.infon("four lines of output");.
Font : This class contains all specifications of a font, such as family of font, size, style, and color. Various fonts are declared as static constants in this class. List : This class represents a list, which, in turn, contains a number of ListItems.
PDFPTable : This is a table that can be put at an absolute position but can also be added to the document as the class Table. Anchor : An Anchor can be a reference or a destination of a reference.
A link like we have in HTML pages. PdfWriter : When this PdfWriter is added to a certain PdfDocument, the PDF representation of every Element added to this Document will be written to the outputstream attached to writer file or network.
Simple and clear. In this application, I will create a PDF file with a single statement in content. FileNotFoundException; import java.
FileOutputStream; import com. Document; import com. DocumentException; import com. Paragraph; import com. Set file attributes to PDF file This example shows how to set various attributes like author name, created date, creator name or simply title of the pdf file.
It can be used to achieve fully abstraction and multiple inheritance. No, because methods of an interface is abstract by default, and static and abstract keywords cant be used together. No, because its implementation is provided by another class. An interface that have no data member and method is known as a marker interface. For example Serializable, Cloneable etc. Abstract class 1 An abstract class can have method body nonabstract methods. Interface have only abstract methods.
An interface cannot have instance variables. Interface cannot have constructor. Interface cannot have static methods. You can implement multiple interfaces. No, they are implicitly public.
An object reference can be cast to an interface reference when the object implements the referenced interface. A package is a group of similar type of classes interfaces and sub-packages. It provides access protection and removes naming collision.
It is by default loaded internally by the JVM.
Will the JVM load the package twice at runtime? One can import the same package or same class multiple times. Neither compiler nor JVM complains about it.
But the JVM will internally load the class only once no matter how many times you import the same class. By static import, we can access the static members of a class directly, there is no to qualify it with the class name.
Exception Handling is a mechanism to handle runtime errors. It is mainly used to handle checked exceptions. Checked exceptions are checked at compile-time. The classes that extend RuntimeException are known as unchecked exceptions e.
ArithmeticException,NullPointerExcept ion etc. Unchecked exceptions are not checked at compiletime. Ans: In Java, access specifiers are the keywords used before a class name which defines the access scope. The types of access specifiers for classes are: 1. Public : Class,Method,Field is accessible from anywhere. Protected:Method,Field can be accessed from the same class to which they belong or from the sub-classes,and from the class of same package,but not from outside.
Default: Method,Field,class can be accessed only from the same package and not from outside of it's native package. Private: Method,Field can be accessed from the same class to which they belong.
What's the purpose of Static methods and static variables? Ans: When there is a requirement to share a method or a variable between multiple objects of a class instead of creating separate copies for each object, we use static keyword to make a method or variable shared for all objects. What is data encapsulation and what's its significance? Ans: Encapsulation is a concept in Object Oriented Programming for combining properties and methods in a single unit.
Encapsulation helps programmers to follow a modular approach for software development as each object has its own set of methods and variables and serves its functions independent of other objects.
Encapsulation also serves data hiding purpose. What is a singleton class? Give a practical example of its usage. A singleton class in java can have only one instance and hence all its methods and variables belong to just one instance.
Singleton class concept is useful for the situations when there is a need to limit the number of objects for a class. The best example of singleton usage scenario is when there is a limit of having only one connection to a database due to some driver limitations or because of any licensing issues.
What are Loops in Java? What are three types of loops? Ans: Looping is used in programming to execute a statement or a block of statement repeatedly. There are three types of loops in Java: 1 For Loops For loops are used in java to execute statements repeatedly for a given number of times.
For loops are used when number of times to execute the statements is known to programmer. In while loops, condition is checked first before execution of statements.
Hence in case of do while loop, statements are executed at least once. Q7: What is an infinite Loop? How infinite loop is declared? Ans: An infinite loop runs without any condition and runs infinitely. An infinite loop can be broken by defining any breaking logic in the body of the statement blocks. What is the difference between continue and break statement?
Ans: break and continue are two important keywords used in Loops. When a break keyword is used in a loop, loop is broken instantly while when continue keyword is used, current iteration is broken and loop continues with next iteration. In below example, Loop is broken when counter reaches 4.
What is the difference between double and float variables in Java? Ans: In java, float takes 4 bytes in memory while Double takes 8 bytes in memory. Float is single precision floating point decimal number while Double is double precision decimal number.
What is Final Keyword in Java? Give an example. Ans: In java, a constant is declared using the keyword Final. Value can be assigned only once and after assignment, value of a constant can't be changed.
This method are faster than any other method,because they are resolved at complied time. When a class is declares as final,it cannot be subclassed. Example String,Integer and other wrapper classes.
What is ternary operator? Ans: Ternary operator , also called conditional operator is used to decide which value to assign to a variable based on a Boolean value evaluation. It's denoted as? In the below example, if rank is 1, status is assigned a value of "Done" else "Pending". Ans: Using Math.
What is default switch case? Give example. Ans: In a switch statement, default case is executed when no other switch condition matches. Default case is an optional case.
It can be declared only once all other switch cases have been coded. In the below example, when score is not 1 or 2, default case is used. What's the base class in Java from which all classes are derived?
Ans: java. Can main method in Java can return any data? Ans: In java, main method can't return any data and hence, it's always declared with a void return type. What are Java Packages?
What's the significance of packages? Ans: In Java, package is a collection of classes and interfaces which are bundled together as they are related to each other. Use of packages helps developers to modularize the code and group the code for proper re-use. Once code has been packaged in Packages, it can be imported in other classes and used.