public class Caesar { public static final String SOURCE = "abcdefghijklmnopqrstuvwxyz"; public static final int LEN = SOURCE.length(); /** * @param args */ public static void main(String[] args) { String result = caesarEncryption("newyork"); System.out.println("encryption result:" + result); System.out.println("decryption result:" + caesarDecryption(result)); } //Encryption public static String caesarEncryption(String s) { StringBuilder sb = new StringBuilder(); if (s == null || s.length() < 1) { System.out.println("you Input nothing."); return null; } if (!isAlp(s)) { System.out.println("input ABC... only"); return null; } s = s.toLowerCase(); int len = s.length(); for (int j = 0; j < len; j++) { char c = s.charAt(j); int a = SOURCE.indexOf(c); if (a == LEN -1) a = -1; if (a == LEN -2) a = -2; if (a == LEN - 3) a = -3; sb.append(SOURCE.charAt(a + 3)); } return sb.toString(); } //Decryption public static String caesarDecryption(String s) { StringBuilder sb = new StringBuilder(); if (s == null || s.length() < 1) { System.out.println("you Input nothing."); return null; } if (!isAlp(s)) { System.out.println("input ABC... only"); return null; } s = s.toLowerCase(); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); int a = SOURCE.indexOf(c); if (a == 2) a = LEN + 2; if (a == 1) a = LEN + 1; if (a == 0) a = LEN; sb.append(SOURCE.charAt(a - 3)); } return sb.toString(); } public static boolean isAlp(String s) { String p = "^[A-Za-z]+$"; Pattern pattern = Pattern.compile(p); Matcher matcher = pattern.matcher(s); if (matcher.find()) { return true; } return false; } }
For more articles related to JAVA implementation of caesar Caesar encryption algorithm, please pay attention to the PHP Chinese website!

JVMmanagesgarbagecollectionacrossplatformseffectivelybyusingagenerationalapproachandadaptingtoOSandhardwaredifferences.ItemploysvariouscollectorslikeSerial,Parallel,CMS,andG1,eachsuitedfordifferentscenarios.Performancecanbetunedwithflagslike-XX:NewRa

Java code can run on different operating systems without modification, because Java's "write once, run everywhere" philosophy is implemented by Java virtual machine (JVM). As the intermediary between the compiled Java bytecode and the operating system, the JVM translates the bytecode into specific machine instructions to ensure that the program can run independently on any platform with JVM installed.

The compilation and execution of Java programs achieve platform independence through bytecode and JVM. 1) Write Java source code and compile it into bytecode. 2) Use JVM to execute bytecode on any platform to ensure the code runs across platforms.

Java performance is closely related to hardware architecture, and understanding this relationship can significantly improve programming capabilities. 1) The JVM converts Java bytecode into machine instructions through JIT compilation, which is affected by the CPU architecture. 2) Memory management and garbage collection are affected by RAM and memory bus speed. 3) Cache and branch prediction optimize Java code execution. 4) Multi-threading and parallel processing improve performance on multi-core systems.

Using native libraries will destroy Java's platform independence, because these libraries need to be compiled separately for each operating system. 1) The native library interacts with Java through JNI, providing functions that cannot be directly implemented by Java. 2) Using native libraries increases project complexity and requires managing library files for different platforms. 3) Although native libraries can improve performance, they should be used with caution and conducted cross-platform testing.

JVM handles operating system API differences through JavaNativeInterface (JNI) and Java standard library: 1. JNI allows Java code to call local code and directly interact with the operating system API. 2. The Java standard library provides a unified API, which is internally mapped to different operating system APIs to ensure that the code runs across platforms.

modularitydoesnotdirectlyaffectJava'splatformindependence.Java'splatformindependenceismaintainedbytheJVM,butmodularityinfluencesapplicationstructureandmanagement,indirectlyimpactingplatformindependence.1)Deploymentanddistributionbecomemoreefficientwi

BytecodeinJavaistheintermediaterepresentationthatenablesplatformindependence.1)Javacodeiscompiledintobytecodestoredin.classfiles.2)TheJVMinterpretsorcompilesthisbytecodeintomachinecodeatruntime,allowingthesamebytecodetorunonanydevicewithaJVM,thusfulf


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Atom editor mac version download
The most popular open source editor

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Notepad++7.3.1
Easy-to-use and free code editor

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
