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Programs written in Java have a reputation for being slower and requiring more memory than those written in C++.[50][51] However, Java programs' execution speed improved significantly with the introduction of just-in-time compilation in 1997/1998 for Java 1.1,[52] the addition of language features supporting better code analysis (such as inner classes, the StringBuilder class, optional assertions, etc.), and optimizations in the Java virtual machine, such as HotSpot becoming Sun's default JVM in 2000. With Java 1.5, the performance was improved with the addition of the java.util.concurrent package, including lock-free implementations of the ConcurrentMaps and other multi-core collections, and it was improved further with Java 1.6.

All source files must be named after the public class they contain, appending the suffix .java, for example, HelloWorldApp.java. It must first be compiled into bytecode, using a Java compiler, producing a file with the .class suffix (Main.class, in this case). Only then can it be executed or launched. The Java source file may only contain one public class, but it can contain multiple classes with a non-public access modifier and any number of public inner classes. When the source file contains multiple classes, it is necessary to make one class (introduced by the class keyword) public (preceded by the public keyword) and name the source file with that public class name.

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A class that is not declared public may be stored in any .java file. The compiler will generate a class file for each class defined in the source file. The name of the class file is the name of the class, with .class appended. For class file generation, anonymous classes are treated as if their name were the concatenation of the name of their enclosing class, a $, and an integer.

The keyword public denotes that a method can be called from code in other classes, or that a class may be used by classes outside the class hierarchy.[61] The class hierarchy is related to the name of the directory in which the .java file is located. This is called an access level modifier. Other access level modifiers include the keywords private (a method that can only be accessed in the same class) and protected (which allows code from the same package to access).[61] If a piece of code attempts to access private methods or protected methods, the JVM will throw a SecurityException.

r/Java is for News, Technical discussions, research papers and assorted things of interest related to the Java programming language, not for help with Java programming. Such "help with programming" posts should go to r/javahelp.

The tooling JDK will be used to launch the Language Server for Java. And by default, will also be used to compile your projects. Java 17 is the minimum required version.

The path to the Java Development Kit can be specified by the java.jdt.ls.java.home setting in VS Code settings (workspace/user settings). If not specified, it is searched in the following order until a JDK meets current minimum requirement.

java.configuration.updateBuildConfiguration : Specifies how modifications on build files update the Java classpath/configuration. Supported values are disabled (nothing happens), interactive (asks about updating on every modification), automatic (updating is automatically triggered).

java.configuration.checkProjectSettingsExclusions: Deprecated, please use 'java.import.generatesMetadataFilesAtProjectRoot' to control whether to generate the project metadata files at the project root. And use 'files.exclude' to control whether to hide the project metadata files from the file explorer. Controls whether to exclude extension-generated project settings files (.project, .classpath, .factorypath, .settings/) from the file explorer. Defaults to false.

java.completion.filteredTypes: Defines the type filters. All types whose fully qualified name matches the selected filter strings will be ignored in content assist or quick fix proposals and when organizing imports. For example 'java.awt.*' will hide all types from the awt packages.

java.codeGeneration.hashCodeEquals.useJava7Objects: Use Objects.hash and Objects.equals when generating the hashCode and equals methods. This setting only applies to Java 7 and higher. Defaults to false.

java.completion.maxResults: Maximum number of completion results (not including snippets). 0 (the default value) disables the limit, all results are returned. In case of performance problems, consider setting a sensible limit.

java.project.importOnFirstTimeStartup: Specifies whether to import the Java projects, when opening the folder in Hybrid mode for the first time. Supported values are disabled (never imports), interactive (asks to import or not), automatic (always imports). Default to automatic.

java.project.resourceFilters: Excludes files and folders from being refreshed by the Java Language Server, which can improve the overall performance. For example, ["node_modules",".git"] will exclude all files and folders named 'node_modules' or '.git'. Pattern expressions must be compatible with java.util.regex.Pattern. Defaults to ["node_modules",".git"].

java.templates.fileHeader: Specifies the file header comment for new Java file. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables.

java.templates.typeComment: Specifies the type comment for new Java type. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables.

java.compile.nullAnalysis.nonnull: Specify the Nonnull annotation types to be used for null analysis. If more than one annotation is specified, then the topmost annotation will be used first if it exists in your project dependencies. This setting will be ignored if java.compile.nullAnalysis.mode is set to disabled.

java.compile.nullAnalysis.nullable: Specify the Nullable annotation types to be used for null analysis. If more than one annotation is specified, then the topmost annotation will be used first if it exists in your project dependencies. This setting will be ignored if java.compile.nullAnalysis.mode is set to disabled.

java.codeAction.sortMembers.avoidVolatileChanges: Reordering of fields, enum constants, and initializers can result in semantic and runtime changes due to different initialization and persistence order. This setting prevents this from occurring. Defaults to true.

java.jdt.ls.protobufSupport.enabled: Specify whether to automatically add Protobuf output source directories to the classpath. Note: Only works for Gradle com.google.protobuf plugin 0.8.4 or higher. Defaults to true.

java.jdt.ls.androidSupport.enabled: [Experimental] Specify whether to enable Android project importing. When set to auto, the Android support will be enabled in Visual Studio Code - Insiders. Note: Only works for Android Gradle Plugin 3.2.0 or higher. Defaults to auto.

java.compile.nullAnalysis.mode: Specify how to enable the annotation-based null analysis. Supported values are disabled (disable the null analysis), interactive (asks when null annotation types are detected), automatic (automatically enable null analysis when null annotation types are detected). Defaults to interactive.

java.cleanup.actionsOnSave: The list of clean ups to be run on the current document when it's saved. Clean ups can automatically fix code style or programming mistakes. Click here to learn more about what each clean up does.

java.sharedIndexes.enabled: [Experimental] Specify whether to share indexes between different workspaces. Defaults to auto and the shared indexes is automatically enabled in Visual Studio Code - Insiders.

java.import.maven.disableTestClasspathFlag : Enable/disable test classpath segregation. When enabled, this permits the usage of test resources within a Maven project as dependencies within the compile scope of other projects. Defaults to false.

java.configuration.detectJdksAtStart: Automatically detect JDKs installed on local machine at startup. If you have specified the same JDK version in java.configuration.runtimes, the extension will use that version first. Defaults to true.

As indicated above, this plugin adds basic building blocks for working with JVM projects.Its feature set has been superseded by other plugins, offering more features based on your project type.Instead of applying it directly to your project, you should look into the java-library or application plugins or one of the supported alternative JVM language.

The resources of this source set. Contains only resources, and excludes any .java files found in the resource directories. Other plugins, such as the Groovy Plugin, exclude additional types of files from this collection.

Using a custom executable or javaHome deactivates some optimizations.The compile task does not use incremental build immediately after a compile error or if a Java constant changes.Use toolchains instead if possible.

As a user you can see which annotation processors are triggering full recompilations in the --info log.Incremental annotation processing will be deactivated if a custom executable or javaHome is configured on the compile task.

If you use the appender library (aws-lambda-java-log4j2), you must also configure a transformer for the Maven Shade plugin. The transformer library combines versions of a cache file that appear in both the appender library and in Log4j.

At runtime, config vars are exposed to your app as environment variables. For example, modify GettingStartedApplication.java so that the method obtains an energy value from the ENERGY environment variable: 2351a5e196