Online class for java

Java online compiler

Write, Run & Share Java code online using OneCompiler’s Java online compiler for free. It’s one of the robust, feature-rich online compilers for Java language, running the Java LTS version 17. Getting started with the OneCompiler’s Java editor is easy and fast. The editor shows sample boilerplate code when you choose language as Java and start coding.

Taking inputs (stdin)

OneCompiler’s Java online editor supports stdin and users can give inputs to the programs using the STDIN textbox under the I/O tab. Using Scanner class in Java program, you can read the inputs. Following is a sample program that shows reading STDIN ( A string in this case ).

import java.util.Scanner; class Input < public static void main(String[] args) < Scanner input = new Scanner(System.in); System.out.println("Enter your name: "); String inp = input.next(); System.out.println("Hello, " + inp); >>

Adding dependencies

OneCompiler supports Gradle for dependency management. Users can add dependencies in the build.gradle file and use them in their programs. When you add the dependencies for the first time, the first run might be a little slow as we download the dependencies, but the subsequent runs will be faster. Following sample Gradle configuration shows how to add dependencies

apply plugin:'application' mainClassName = 'HelloWorld' run < standardInput = System.in >sourceSets < main < java < srcDir './' >> > repositories < jcenter() >dependencies < // add dependencies here as below implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.9' >

About Java

Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world’s number one server programming language with a 12 million developer community, 5 million students studying worldwide and it’s #1 choice for the cloud development.

Syntax help

Variables

short x = 999; // -32768 to 32767 int x = 99999; // -2147483648 to 2147483647 long x = 99999999999L; // -9223372036854775808 to 9223372036854775807 float x = 1.2; double x = 99.99d; byte x = 99; // -128 to 127 char x = 'A'; boolean x = true;

Loops

1. If Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) < // code >else < // code >

2. Switch:

Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.

3. For:

For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.

for(Initialization; Condition; Increment/decrement) < //code >

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

Classes and Objects

Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.

How to create a Class:

class keyword is required to create a class.

Example:

How to create a Object:

How to define methods in a class:

public class Greeting < static void hello() < System.out.println("Hello.. Happy learning!"); >public static void main(String[] args) < hello(); >>

Collections

Collection is a group of objects which can be represented as a single unit. Collections are introduced to bring a unified common interface to all the objects.

Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:

This framework also defines map interfaces and several classes in addition to Collections.

Advantages:

• High performance
• Reduces developer’s effort
• Unified architecture which has common methods for all objects.

Источник

online compiler and debugger for c/c++

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IDE Shortcuts: New file : Ctrl-M Run Code : F9 Debug Code : F8 Save Project : Ctrl-S Beautify Code : Ctrl-B Settings Menu : Ctrl-Shift-S Info : Ctrl-I Editor Shortcuts: showSettingsMenu : Ctrl-, goToNextError : Alt-E goToPreviousError : Alt-Shift-E selectall : Ctrl-A gotoline : Ctrl-L fold : Alt-L|Ctrl-F1 unfold : Alt-Shift-L|Ctrl-Shift-F1 toggleFoldWidget : F2 toggleParentFoldWidget : Alt-F2 foldOther : Alt-0 unfoldall : Alt-Shift-0 findnext : Ctrl-K findprevious : Ctrl-Shift-K selectOrFindNext : Alt-K selectOrFindPrevious : Alt-Shift-K find : Ctrl-F overwrite : Insert selecttostart : Ctrl-Shift-Home gotostart : Ctrl-Home selectup : Shift-Up golineup : Up selecttoend : Ctrl-Shift-End gotoend : Ctrl-End selectdown : Shift-Down golinedown : Down selectwordleft : Ctrl-Shift-Left gotowordleft : Ctrl-Left selecttolinestart : Alt-Shift-Left gotolinestart : Alt-Left|Home selectleft : Shift-Left gotoleft : Left selectwordright : Ctrl-Shift-Right gotowordright : Ctrl-Right selecttolineend : Alt-Shift-Right gotolineend : Alt-Right|End selectright : Shift-Right gotoright : Right selectpagedown : Shift-Pagedown gotopagedown : Pagedown selectpageup : Shift-Pageup gotopageup : Pageup scrollup : Ctrl-Up scrolldown : Ctrl-Down selectlinestart : Shift-Home selectlineend : Shift-End togglerecording : Ctrl-Alt-E replaymacro : Ctrl-Shift-E jumptomatching : Ctrl-P selecttomatching : Ctrl-Shift-P expandToMatching : Ctrl-Shift-M removeline : Ctrl-D duplicateSelection : Ctrl-Shift-D sortlines : Ctrl-Alt-S togglecomment : Ctrl-/ toggleBlockComment : Ctrl-Shift-/ modifyNumberUp : Ctrl-Shift-Up modifyNumberDown : Ctrl-Shift-Down replace : Ctrl-H undo : Ctrl-Z redo : Ctrl-Shift-Z|Ctrl-Y copylinesup : Alt-Shift-Up movelinesup : Alt-Up copylinesdown : Alt-Shift-Down movelinesdown : Alt-Down del : Delete backspace : Shift-Backspace|Backspace cut_or_delete : Shift-Delete removetolinestart : Alt-Backspace removetolineend : Alt-Delete removewordleft : Ctrl-Backspace removewordright : Ctrl-Delete outdent : Shift-Tab indent : Tab blockoutdent : Ctrl-[ blockindent : Ctrl-] transposeletters : Ctrl-T touppercase : Ctrl-U tolowercase : Ctrl-Shift-U expandtoline : Ctrl-Shift-L addCursorAbove : Ctrl-Alt-Up addCursorBelow : Ctrl-Alt-Down addCursorAboveSkipCurrent : Ctrl-Alt-Shift-Up addCursorBelowSkipCurrent : Ctrl-Alt-Shift-Down selectMoreBefore : Ctrl-Alt-Left selectMoreAfter : Ctrl-Alt-Right selectNextBefore : Ctrl-Alt-Shift-Left selectNextAfter : Ctrl-Alt-Shift-Right splitIntoLines : Ctrl-Alt-L alignCursors : Ctrl-Alt-A findAll : Ctrl-Alt-K showKeyboardShortcuts : Ctrl-Alt-H

Источник

Java online compiler

Write, Run & Share Java code online using OneCompiler’s Java online compiler for free. It’s one of the robust, feature-rich online compilers for Java language, running the Java LTS version 17. Getting started with the OneCompiler’s Java editor is easy and fast. The editor shows sample boilerplate code when you choose language as Java and start coding.

Taking inputs (stdin)

OneCompiler’s Java online editor supports stdin and users can give inputs to the programs using the STDIN textbox under the I/O tab. Using Scanner class in Java program, you can read the inputs. Following is a sample program that shows reading STDIN ( A string in this case ).

import java.util.Scanner; class Input < public static void main(String[] args) < Scanner input = new Scanner(System.in); System.out.println("Enter your name: "); String inp = input.next(); System.out.println("Hello, " + inp); >>

Adding dependencies

OneCompiler supports Gradle for dependency management. Users can add dependencies in the build.gradle file and use them in their programs. When you add the dependencies for the first time, the first run might be a little slow as we download the dependencies, but the subsequent runs will be faster. Following sample Gradle configuration shows how to add dependencies

apply plugin:'application' mainClassName = 'HelloWorld' run < standardInput = System.in >sourceSets < main < java < srcDir './' >> > repositories < jcenter() >dependencies < // add dependencies here as below implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.9' >

About Java

Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world’s number one server programming language with a 12 million developer community, 5 million students studying worldwide and it’s #1 choice for the cloud development.

Syntax help

Variables

short x = 999; // -32768 to 32767 int x = 99999; // -2147483648 to 2147483647 long x = 99999999999L; // -9223372036854775808 to 9223372036854775807 float x = 1.2; double x = 99.99d; byte x = 99; // -128 to 127 char x = 'A'; boolean x = true;

Loops

1. If Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) < // code >else < // code >

2. Switch:

Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.

3. For:

For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.

for(Initialization; Condition; Increment/decrement) < //code >

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

Classes and Objects

Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.

How to create a Class:

class keyword is required to create a class.

Example:

How to create a Object:

How to define methods in a class:

public class Greeting < static void hello() < System.out.println("Hello.. Happy learning!"); >public static void main(String[] args) < hello(); >>

Collections

Collection is a group of objects which can be represented as a single unit. Collections are introduced to bring a unified common interface to all the objects.

Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:

This framework also defines map interfaces and several classes in addition to Collections.

Advantages:

• High performance
• Reduces developer’s effort
• Unified architecture which has common methods for all objects.

Источник

Java Class From JSON Generator

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Ctrl + Alt + H	Open this Help
Ctrl + Alt + Shift + S	Configure Global Settings
Ctrl + Alt + Enter	Generate (Submit)
Ctrl + Alt + Backspace	Clear Output
Ctrl + Alt + Shift + F	Fullscreen Input
Ctrl + Alt + F	Fullscreen Output
Ctrl + Alt + D	Download Output
Ctrl + Alt + C	Copy Output
Ctrl + Alt + U	Focus URL Textbox
Enter (inside URL text box)	Load URL
Ctrl + Alt + L	Load Input File
Ctrl + Alt + E	Load Example
Ctrl + Alt + I	Focus Input Editor
Ctrl + Alt + S	Focus Settings
Ctrl + Alt + O	Focus Output Editor
Ctrl + Alt + Shift + Up	Expand All Output
Ctrl + Alt + Shift + Down	Collapse All Output

Global Settings

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Output: Generated Classes

JSON to C# Class

Generate Newtonsoft annotated C# model or stub classes from JSON text, document, file or data

Generate Java Class from JSON

Use this tool to quickly generate model classes for Java or POJOs from a sample JSON document. The Java model classes are annotated using JsonProperty attribute supplied by Jackson.

JSON

JavaScript Object Notation (JSON), pronounced as Jason, is the most common data interchange format on the web. Douglas Crockford first released the JSON specification in the early 2000s. It is a simple format that is easier to comprehend than XML. It is also smaller in size because it does not have closing tags. A wide variety of programming languages can parse JSON files. They also support the serialization of data structures to JSON. You can copy JSON text to JavaScript and start using them without any modifications.

Settings Explained

1. Annotate

Annotate On

public class Person < private String name; private int age; @JsonProperty("name") public String getName() < return name; >@JsonProperty("name") public void setName(String name) < this.name = name; >@JsonProperty("age") public int getAge() < return age; >@JsonProperty("age") public void setAge(int age) < this.age = age; >>

Annotate Off

public class Person < private String name; private int age; public String getName() < return name; >public void setName(String name) < this.name = name; >public int getAge() < return age; >public void setAge(int age) < this.age = age; >>

Источник