javac

I'm running Windows 8 and I can not get javac to work. I have set my PATH in environmental variables to C:\Program Files (x86)\Java\jdk1.7.0_17\bin I have tried both with and without ';' but to no avail. I recently had this issue on my desktop and adding ; worked but it's not in this case. I have made sure that javac does exist in the bin too. Any suggestions on fixes would be greatly appreciated. EDITS echo %PATH% gives: C:\Users\Arktri\Desktop>echo %PATH% C:\Program Files (x86)\Intel\iCLS Client\; C:\Program Files\Intel\iCLS Client\; C:\Windows\system32;C:\Windows; C:\Windows\System32\Wbem;

I'm trying to create a custom annotation that, for example, ensures that a field or method is both public and final , and would generate a compile time error if the field or method is not both public and final , as in these examples: // Compiles @PublicFinal public final int var = 2; // Compiles @PublicFinal public final void myMethod {} // Compile time error @PublicFinal private final int fail = 2; So far, I've made both the custom annotation interface: import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang

There are several other SO questions talking about generics compiling OK w/ Eclipse's compiler but not javac (i.e. Java: Generics handled differenlty in Eclipse and javac and Generics compiles and runs in Eclipse, but doesn't compile in javac ) -- however this looks like a slightly different one. I have an enum class: public class LogEvent { public enum Type { // ... values here ... } ... } and I have another class with a method that takes in arbitrary objects of types descended from Enum : @Override public <E extends Enum<E>> void postEvent( Context context, E code, Object additionalData) {

Consider the following code public class JDK10Test { public static void main(String[] args) { Double d = false ? 1.0 : new HashMap<String, Double>().get("1"); System.out.println(d); } } When running on JDK8, this code prints null whereas on JDK10 this code results in NullPointerException Exception in thread "main" java.lang.NullPointerException at JDK10Test.main(JDK10Test.java:5) The bytecode produced by the compilers is almost identical apart from two additional instructions produced by the JDK10 compiler which are related to autoboxing and seem to be responsible for the NPE. 15:

I must be missing something here. In Java 5, the "for-each loop" statement (also called the enhanced for loop) was introduced. It appears that it was introduced mainly to iterate through Collections . Any collection (or container) class that implements the Iterable interface is eligible for iteration using the "for-each loop". Perhaps for historic reasons, the Java arrays did not implement the Iterable interface. But since arrays were/are ubiquitous, javac would accept the use of for-each loop on arrays (generating bytecode equivalent to a traditional for loop). In Java 8, the forEach method