java.lang.illegalargumentexception: unsupported class file major version 66 错误表明 Java 虚拟机(JVM)在尝试加载一个类文件时,遇到了它不支持的类文件主版本号 66。类文件的主版本号是 Java 类文件格式中的一个字段,用于指示该类文件是为哪个版本的 Java 平台编译的。 2. 可能原因 Java 版本不匹配:此错误...
Class文件大致可分10个部分:魔数(MagicNumber)、Class文件版本(Version)、常量池(Constant_Pool)、访问标记(Access_flag)、本类(This_class)、父类(Super_class)、接口(Interfaces)、字段集合(Fields)、方法集合(Methods )、属性集合(Attributes)。 具体顺序定义如图: 2.详细结构 2.1 示例Java源码及编译后的字节码 ...
importjava.io.FileOutputStream;importjava.io.IOException;importjava.nio.file.Files;importjava.nio.file.Path;importjava.nio.file.Paths;publicclassMain{publicstaticvoidmain(String[]args){try{Pathpath=Paths.get("com/example/MyClass.class");byte[]classBytes=Files.readAllBytes(path);byte[]modifiedClass...
1、【jar】Java Runtime recognizes class file versions up to 52.0
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{66File file =newFile((String)folderList.getLast());67if(file.delete())68folderList.removeLast();69else{70File[] files =file.listFiles();71for(inti = 0; i < files.length; i++) {72folderList.add(files[i].getPath());73}74}75}76775.删除一个文件下夹所有的文件夹78/*79import ...
如果要回復舊的行為,可以設定 jdk.net.URLClassPath.disableRestrictedPermissions 系統特性以停用此變更。JDK-8151934 (未公開) logging.properties 中有新的可設定特性 java.util.logging.FileHandler.maxLocks java.util.logging.FileHandler 增加了一個新的可設定特性 "java.util.logging.FileHandler.maxLocks"。您...
classCat{publicCat(String name){this.name=name;}privateString name;publicStringgetName(){returnname;}publicvoidsetName(String name){this.name=name;}}Cat c1=newCat("王磊");Cat c2=newCat("王磊");System.out.println(c1.equals(c2));// false ...
The JarInputStream class now treats a signed JAR as unsigned if it detects a second manifest within the first two entries in the JAR file. A warning message "WARNING: Multiple MANIFEST.MF found. Treat JAR file as unsigned." is logged if the system property, -Djava.security.debug=jar, is...
6 */7publicclassBook{8privateString id;9privateString name;10privateString author;11privateString year;12privateString price;13privateString language;14publicStringgetId(){15returnid;16}17publicvoidsetId(String id){18this.id=id;19}20publicStringgetName(){21returnname;22}23publicvoidsetName(Strin...