The following example demonstrates using the file.lastModified() method of the File class to obtain the last modified time of the directory:
/* author by w3cschool.cc Main.java */import java.io.File;import java.util.Date;public class Main { public static void main(String[] args) { File file = new File("C://FileIO//demo.txt"); System.out.println("最后修改时间:" + new Date(file.lastModified())); }}
The output result of running the above code is:
最后修改时间:Fri Apr 10 11:09:19 CST 2015
The above is the Java example - Get the content of the last modification time of the directory. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

Multithreading is important in modern programming because it can improve program responsiveness and resource utilization and handle complex concurrent tasks. JVM ensures the consistency and efficiency of multithreads on different operating systems through thread mapping, scheduling mechanism and synchronization lock mechanism.

Java's platform independence means that the code written can run on any platform with JVM installed without modification. 1) Java source code is compiled into bytecode, 2) Bytecode is interpreted and executed by the JVM, 3) The JVM provides memory management and garbage collection functions to ensure that the program runs on different operating systems.

Javaapplicationscanindeedencounterplatform-specificissuesdespitetheJVM'sabstraction.Reasonsinclude:1)Nativecodeandlibraries,2)Operatingsystemdifferences,3)JVMimplementationvariations,and4)Hardwaredependencies.Tomitigatethese,developersshould:1)Conduc

Cloud computing significantly improves Java's platform independence. 1) Java code is compiled into bytecode and executed by the JVM on different operating systems to ensure cross-platform operation. 2) Use Docker and Kubernetes to deploy Java applications to improve portability and scalability.

Java'splatformindependenceallowsdeveloperstowritecodeonceandrunitonanydeviceorOSwithaJVM.Thisisachievedthroughcompilingtobytecode,whichtheJVMinterpretsorcompilesatruntime.ThisfeaturehassignificantlyboostedJava'sadoptionduetocross-platformdeployment,s

Containerization technologies such as Docker enhance rather than replace Java's platform independence. 1) Ensure consistency across environments, 2) Manage dependencies, including specific JVM versions, 3) Simplify the deployment process to make Java applications more adaptable and manageable.

JRE is the environment in which Java applications run, and its function is to enable Java programs to run on different operating systems without recompiling. The working principle of JRE includes JVM executing bytecode, class library provides predefined classes and methods, configuration files and resource files to set up the running environment.

JVM ensures efficient Java programs run through automatic memory management and garbage collection. 1) Memory allocation: Allocate memory in the heap for new objects. 2) Reference count: Track object references and detect garbage. 3) Garbage recycling: Use the tag-clear, tag-tidy or copy algorithm to recycle objects that are no longer referenced.


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