What are the different versions of the Java Virtual Machine?

The Java Virtual Machine (JVM) is responsible for running Java bytecode and has multiple versions. Major releases include Java 8 (introducing Lambda expressions, streams API), Java 11 (improved garbage collector), Java 14 (introducing pattern matching), and Java 17 (introducing sealed classes). In order to check the JVM version, you can use System.getProperties() to get the Java version.

Different versions of Java Virtual Machine

Overview

Java Virtual Machine( JVM) is responsible for running Java bytecode, which is a key component of Java program execution. It comes in multiple versions, each offering different features and improvements.

Main Version

##Java 82014Lambda expression, stream API, time and date APIJava 112018Local variable symbol table, garbage collector improvements, module system enhancementsJava 142020Pattern matching, logging, JShell improvementsJava 172021Sealed classes, text conversion API, Switch expression

Version	Release Date	Main Features

Practical case: Java version check

In order to check the JVM version running the Java program, you can use The following code:

import java.util.Properties;

public class JavaVersionCheck {

    public static void main(String[] args) {
        // 获取系统属性
        Properties props = System.getProperties();

        // 获取 Java 版本
        String javaVersion = props.getProperty("java.version");

        // 打印 Java 版本
        System.out.println("Java 版本：" + javaVersion);
    }
}

Output:

Java 版本：11.0.13

This will print the JVM version of the running program.

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