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memorize.ai (lvl 286)

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Section 1

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Pass by value

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Java

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6 years ago

Date created

Mar 14, 2020

Cards (18)

Section 1

(18 cards)

Pass by value

Front

, Java creates a copy of the variable being passed in the method and then do the manipulations. Hence the change is not reflected in the main method.

Back

.ear files

Front

enterprise java beans

Back

Object relational mappin

Front

The mapped objects in a Java class to the tables of the relational database using metadata which describes the database and object mapping. The working method is to transform data from one representation to another.

Back

abstract class

Front

a class that defines attributes and methods for subclasses but is never instantiated

Back

get() vs load()

Front

load will throw exception instead of returning a null

Back

JSF

Front

JavaServer Faces (UI) designing framework for Java Web Applications developments, uses MVC design

Back

Hibernate methods

Front

save, saveorupdate, get, load

Back

war files

Front

The files that need to development of web application (HTML, java scripts, JSP) included with a *.war file extension.

Back

components of J2EE applications

Front

Client-tier components. Run on the client machine. Web tier components. Run on the J2EE server. Business tier components. Run on the J2EE server. Enterprise information system software (EIS software).Runs on the EIS server.

Back

Streams

Front

the Stream API is used to process collections of objects. A stream is a sequence of objects that supports various methods which can be pipelined to produce the desired result.

Back

Hashmap vs Hashtable

Front

hashtable is synchronous, but doesn't allow null keys or values.

Back

Checked exceptions

Front

exceptions that are checked at compile time. If some code within a method throws a checked exception, then the method must either handle the exception or it must specify the exception using throws keyword. IOException, FileNotFound

Back

Unchecked exception

Front

An exception that is not checked by the compiler, and therefore, a programmer may choose to handle or manage these types of exceptions. Examples include null pointers and array index of bounds.

Back

servlets

Front

Server side component that provides a powerful mechanism to create server side programs. There are servlets available with a design for various protocols. Servlet is also server and platform independent. Most commonly use protocol for the servlet is Hypertext Transfer Protocol (HTTP).Also, a servlet is a pure java object.

Back

multithreading

Front

feature that allows concurrent execution of two or more parts of a program for maximum utilization of CPU. Each part of such program is called a thread. So, threads are light-weight processes within a process

Back

web components

Front

servlets and JSP

Back

Hibernate

Front

Hibernate is an open source object-relational mapping and query service which facilitate to write Hibernate Query Language (HQL) scripts

Back

ArrayList vs LinkedList

Front

Insertions/removals are easy and fast in LinkedList as compared to ArrayList because there is norisk of resizing array and copying content to new array if array gets full . ArrayList also needs to be update its index if you insert something anywhere exceptat the end of array. LinkedList has more memory overhead than ArrayList because in ArrayList each index onlyholds actual object (data) but in case of LinkedList each node holds both data and address

Back