These are for inner classes and static nested classes. The ones with numbers are anonymous inner classes. For example: class Foo { class Bar { } static class Baz { } void run() { Helper t = new Helper() { int helpMethod() { return 2; } }; } } This will produce class files Foo.class, … Read more
The addition of parameter names to the class file format is covered by JEP 118, which was delivered in Java 8. There was a little bit of discussion about why inclusion of parameter names was made optional in OpenJDK email threads here and here. Briefly, the stated reasons to make parameter names optional are concerns … Read more
Just set the path variable to JDK bin in environment variables. Variable Name : PATH Variable Value : C:\Program Files\Java\jdk1.8.0_31\bin But the best practice is to set JAVA_HOME and PATH as follow. Variable Name : JAVA_HOME Variable Value : C:\Program Files\Java\jdk1.8.0_31 Variable Name : PATH Variable Value : %JAVA_HOME%\bin
There are no such things like a a String that was encoded as ISO-8859-1 in memory. Java Strings in memory are always Unicode strings. (Encoded in UTF-16 (as of 2011 – I think it changed with later Java versions), but you don’t really need to now this). The encoding comes only in play when you … Read more
Go to Project > Properties: Java Build Path, tab Libraries Select the JRE > Is modular node and click Edit… Go to the tab Details In the Added exports section click Add… Enter the following: Source module: jdk.compiler Package: com.sun.tools.javac.tree
Select the menu: Window > Preferences > Java > Compiler There you will find several check boxes under the heading “Classfile Generation”.
ToolProvider.getSystemJavaCompiler() is not available. Is tools.jar missing from the classpath? Set class path to the tools.jar file which can found in jdk\jre directory. System.setProperty(“java.home”, “C:\\Program Files\\Java\\jdk1.7.0_02”);
Suppose you did cd C:/projects and HelloWorld.class is in C:/projects/com, then just type: java com.HelloWorld
From what I can tell in the docs, you can’t do it on the command-line. According to the javac documentation, -Xlint:none only disables warnings “not mandated by the Java Language Specification”. It appears that warning you of the use of deprecated APIs is managed by the language spec. Your best option would be to fix … Read more
It depends upon how you wish to call these methods. If you wish to call these methods from other Java source code, then it is considered invalid for reasons illustrated in Edwin’s answer. This is a limitation of the Java Language. However, not all classes need to be generated from Java source code (consider all … Read more