Jason Voorhees is the main character from the Friday the 13th series. He first appeared in Friday the 13th (1980) as the young son of camp cook-turned-murderer Mrs. Voorhees, in which he was portrayed by Ari Lehman. Created by Victor Miller, with contributions by Ron Kurz, Sean S. Cunningham, and Tom Savini, Jason was not originally intended to carry the series as the main antagonist. The character has subsequently been represented in various other media, including novels, video games, comic books, and a cross-over film with another iconic horror film character, Freddy Krueger. The character has primarily been an antagonist in the films, whether by stalking and killing the other characters, or acting as a psychological threat to the protagonist, as is the case in Friday the 13th: A New Beginning. Since Lehman's portrayal, the character has been represented by numerous actors and stuntmen, sometimes by more than one at a time; this has caused some controversy as to who should receive credit for the portrayal. Kane Hodder is the best known of the stuntmen to portray Jason Voorhees, having played the character in four consecutive films. The character's physical appearance has gone through many transformations, with various special makeup effects artists making their mark on the character's design, including makeup artist Stan Winston. Tom Savini's initial design has been the basis for many of the later incarnations. The trademark hockey goalie mask did not appear until Friday the 13th Part III. Since Friday the 13th Part VI: Jason Lives, filmmakers have given Jason superhuman strength, regenerative powers, and near invulnerability. He has been seen as a sympathetic character, whose motivation for killing has been cited as being driven by the immoral actions of his victims and his own rage over having drowned as a child. Jason Voorhees has been featured in various humor magazines, referenced in feature films, parodied in television shows, and was the inspiration for a horror punk band. Several toy lines have been released based on various versions of the character from the Friday the 13th films. Jason Voorhees's hockey mask is a widely recognized image in popular culture.

Java is a general-purpose programming language that is class-based, object-oriented(although not a pure OO language), and designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that compiled Java code can run on all platforms that support Java without the need for recompilation. Java applications are typically compiled to "bytecode" that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but it has fewer low-level facilities than either of them. As of 2018, Java was one of the most popular programming languages in use according to GitHub, particularly for client-server web applications, with a reported 9 million developers.Java was originally developed by James Gosling at Sun Microsystems (which has since been acquired by Oracle) and released in 1995 as a core component of Sun Microsystems' Java platform. The original and reference implementation Java compilers, virtual machines, and class libraries were originally released by Sun under proprietary licenses. As of May 2007, in compliance with the specifications of the Java Community Process, Sun had relicensed most of its Java technologies under the GNU General Public License. Meanwhile, others have developed alternative implementations of these Sun technologies, such as the GNU Compiler for Java (bytecode compiler), GNU Classpath (standard libraries), and IcedTea-Web (browser plugin for applets). The latest version is Java SE 12, released in March 2019. Since Java 9 is no longer supported, Oracle advises its users to "immediately transition" to Java 12. Oracle released the last public update for the legacy Java 8 LTS, which is free for commercial use, in January 2019. Java 8 will be supported with public updates for personal use up to at least December 2020. Oracle and others "highly recommend that you uninstall older versions of Java" because of serious risks due to unresolved security issues. Oracle extended support for Java 6 ended in December 2018.

Jazz is a music genre that originated in the African-American communities of New Orleans, United States, in the late 19th and early 20th centuries, and developed from roots in blues and ragtime. Jazz is seen by many as "America's classical music". Since the 1920s Jazz Age, jazz has become recognized as a major form of musical expression. It then emerged in the form of independent traditional and popular musical styles, all linked by the common bonds of African-American and European-American musical parentage with a performance orientation. Jazz is characterized by swing and blue notes, call and response vocals, polyrhythms and improvisation. Jazz has roots in West African cultural and musical expression, and in African-American music traditions including blues and ragtime, as well as European military band music. Intellectuals around the world have hailed jazz as "one of America's original art forms".As jazz spread around the world, it drew on national, regional, and local musical cultures, which gave rise to different styles. New Orleans jazz began in the early 1910s, combining earlier brass-band marches, French quadrilles, biguine, ragtime and blues with collective polyphonic improvisation. In the 1930s, heavily arranged dance-oriented swing big bands, Kansas City jazz, a hard-swinging, bluesy, improvisational style and Gypsy jazz (a style that emphasized musette waltzes) were the prominent styles. Bebop emerged in the 1940s, shifting jazz from danceable popular music toward a more challenging "musician's music" which was played at faster tempos and used more chord-based improvisation. Cool jazz developed near the end of the 1940s, introducing calmer, smoother sounds and long, linear melodic lines. The 1950s saw the emergence of free jazz, which explored playing without regular meter, beat and formal structures, and in the mid-1950s, hard bop emerged, which introduced influences from rhythm and blues, gospel, and blues, especially in the saxophone and piano playing. Modal jazz developed in the late 1950s, using the mode, or musical scale, as the basis of musical structure and improvisation. Jazz-rock fusion appeared in the late 1960s and early 1970s, combining jazz improvisation with rock music's rhythms, electric instruments, and highly amplified stage sound. In the early 1980s, a commercial form of jazz fusion called smooth jazz became successful, garnering significant radio airplay. Other styles and genres abound in the 2000s, such as Latin and Afro-Cuban jazz.

A jazz band (jazz ensemble or jazz combo) is a musical ensemble that plays jazz music. Jazz bands vary in the quantity of its members and the style of jazz that they play but it is common to find a jazz band made up of a rhythm section and a horn section. The size of a jazz band is closely related to the style of jazz they play as well as the type of venues in which they play. Smaller jazz bands, also known as combos, are common in night clubs and other small venues and will be made up of three to seven musicians; whereas big bands are found in dance halls and other larger venues. Jazz bands can vary in size from a big band, to a smaller trio or quartet. The term jazz trio can refer to a three piece band with a pianist, double bass player and a drummer. Some bands use vocalists, while others are purely instrumental groups. Jazz bands usually have a bandleader. In a big band setting, there is usually more than one player for a type of instrument. Jazz bands and their composition have changed many times throughout the years just as the music itself changes with each performers personal interpretation and improvisation which is one of the greatest appeals of going to see a jazz band.

JBL is an American audio electronics company founded in 1946 by James Bullough Lansing, after whom the company was name. Their primary products are loudspeakers and associated electronics. There are two independent divisions within the company — JBL Consumer and JBL Professional. The former produces audio equipment for the consumer home market while the latter produces professional equipment for the studio, installed sound, tour sound, portable sound (production and DJ), and cinema markets.

J.D. Edwards World Solution Company or JD Edwards, abbreviated JDE, was an Enterprise Resource Planning (ERP) software company. Products included World for IBM AS/400 minicomputers (the users using a computer terminal or terminal emulator), OneWorld for CNC architecture (a client–server fat client), and JD Edwards EnterpriseOne (a web-based thin client). The company was founded March 1977 in Denver, Colorado, by Jack Thompson, C.T.P. "Chuck" Hintze, Dan Gregory, and Ed McVaney. It was purchased by PeopleSoft, Inc. in 2003. PeopleSoft, in turn, was purchased by Oracle Corporation in 2005, and Oracle continues to sell and support EnterpriseOne and World ERP software line.

Jebsen & Co (Chinese: 捷成洋行) is a marketing, distribution and manufacturing company based and headquartered in Lee Garden Two(Chinese: 嘉蘭中心), Causeway Bay, Hong Kong. It is the agent for a range of businesses throughout East Asia, including luxury products, beverages, electronic consumer goods, and industrial equipment. It serves as the main distributor of Porsche, Dyson, Casio and Raymond Weil in the People's Republic of China and Hong Kong. Since 1906, the company has owned the brand Blue Girl beer, which commands leading market share in Hong Kong. Currently Hans Michael Jebsen is the Chairman of the Group, with Helmuth Hennig as the Group Managing Director.

Jeep is a brand of American automobiles that is a division of FCA US LLC (formerly Chrysler Group, LLC), a wholly owned subsidiary of Fiat Chrysler Automobiles. Jeep has been a part of Chrysler since 1987, when Chrysler acquired the Jeep brand, along with remaining assets, from its previous owner: American Motors Corporation (AMC). Jeep's current product range consists solely of sport utility vehicles and off-road vehicles, but has also included pickup trucks in the past. Some of Jeep's vehicles - such as the Grand Cherokee - reach into the luxury SUV segment, a market segment the Wagoneer is considered to have created. Jeep sold 1.4 million SUVs globally in 2016, up from 500,000 in 2008, two-thirds of which in North America, and was Fiat-Chrysler's best selling brand in the U.S. during the first half of 2017. In the U.S. alone, over 2400 dealerships hold franchise rights to sell Jeep-branded vehicles, and if Jeep were spun off into a separate company, it is estimated to be worth between $22 and $33.5 billion — slightly more than all of FCA (US). Prior to 1940 the term "jeep" had been used as U.S. Army slang for new recruits or vehicles, but the World War II "jeep" that went into production in 1941 specifically tied the name to this light military 4x4, arguably making them the oldest four-wheel drive mass-production vehicles now known as SUVs. The Jeep became the primary light 4-wheel-drive vehicle of the United States Army and the Allies during World War II, as well as the postwar period. The term became common worldwide in the wake of the war. Doug Stewart noted: "The spartan, cramped, and unstintingly functional jeep became the ubiquitous World War II four-wheeled personification of Yankee ingenuity and cocky, can-do determination." The Jeep marque has been headquartered in Toledo, Ohio, ever since Willys-Overland launched production of the first CJ or Civilian Jeep branded models there in 1945. Its replacement, the conceptually consistent Jeep Wrangler series, remains in production since 1986. With its solid axles and open top, the Wrangler has been called the Jeep model that is as central to the brand’s identity as the rear-engined 911 is to Porsche. At least two Jeep models (the CJ-5 and the SJ Wagoneer) enjoyed extraordinary three-decade production runs of a single body generation. Jeeps have since the war inspired a number of other light utility vehicles, such as the Land Rover. Many Jeep variants serving similar military and civilian roles have since been designed in other nations. In lowercase the term "jeep" continues to be used as a generic term for vehicles inspired by the Jeep that are suitable for use on rough terrain.

The Jeep Cherokee (XJ) is a sport utility vehicle that was manufactured and marketed by Jeep from 1983 to 2001. Sharing the name of the original full-size SJ model, but without a traditional body-on-frame chassis, the XJ instead featured a light-weight unibody design, The models were originally marketed as Sportwagons and became the precursor to the modern sport utility vehicle (SUV) as that term was not yet in use. The XJ spawned competitors as other automakers began to notice that this Jeep design began replacing regular cars. It also began to supplant the role of the station wagon and "transformed from truck to limousine in the eyes of countless suburban owners." The XJ is a "significant link in the evolution of the 4x4." Built in Toledo, Ohio, USA; Beijing, China; Ferreyra, Argentina; Cairo, Egypt; and in Valencia, Venezuela, the XJ provided the mechanical basis for the MJ-series Jeep Comanche pickup truck. Automotive journalist Robert Cumberford, writing for Automobile, called the Jeep XJ one of the 20 greatest cars of all time — for its design, and "possibly the best SUV shape of all time, it is the paradigmatic model to which other designers have since aspired". The XJ was also selected in 2011 as one of "10 cars that refuse to die" by Kiplinger.

The Willys Jeep (later Kaiser Jeep or AMC Jeep) is the civilian version of the Willys military Jeep of World War II. The first Willys CJ prototype (the CJ-2) was introduced in 1944, and the same basic vehicle remained in production through seven variants and three corporate parents through 1986 when production of the Jeep model was officially ended. The Jeep CJ-7 and Jeep CJ-8 were replaced in 1986 by the similar-looking Jeep Wrangler. The similar model DJ, was a 2-wheel drive only version made by AMC's AM General Division for the United States Postal Service which features a steel hard top and right hand drive.