anonymous-inner-class

Consider this case: public class SomeClass { public void someMethod() { new SomeInterface() { public void someOtherMethod() { new SomeOtherInterface() { new someThirdMethod() { //My question is about code located here. } }; } }; } } Is there a syntax to reference the instance of the anonymous inner class represented by SomeInterface at the commented code? For SomeClass you can do SomeClass.this Is there an equivalent to get the implementation of SomeInterface? If not, of course you can just define a final local variable in the SomeInterface implementation and reference it, but I was just

If you look very carefully at the picture included, you will notice that you can refactor Groovy code using the Eclipse IDE and convert a method to a closure and vice versa. So, what exactly is a closure again and how is it different than a method? Can someone give a good example of using a closure as well as why it's a useful feature? Anonymous inner classes weren't good enough? Seagull Closure is a Closure class instance , that implements Call logic. It may be passed as argument or assigned to a variable. It also has some logic concerned with scope variable accessing and delegating calls.

While doing some basic lambda exercises, the output from an apparently identical anonymous inner class was giving me a different output than the lambda. interface Supplier<T> { T get(T t); } Scenario #1 Supplier<Integer> s1 = new Supplier<Integer>() { @Override public Integer get(Integer t) { return t; } }; Supplier<Integer> s2 = t -> t; System.out.println(s1.get(2)); System.out.println(s2.get(2)); Outputs 2 and 2 . Nothing new here. But when I do this: Scenario #2 Supplier<Integer> s1 = new Supplier<Integer>() { @Override public Integer get(Integer t) { return t++; } }; Supplier<Integer> s2 =

I'm using Eclipse and I've written a Java application using SWT. When Eclipse compiles my program, it renames my main file into 4 different files like this: MainFile.class MainFile$1.class MainFile$2.class MainFile$3.class When I go to run this program from command line, I get Could not find the main class: MainFile.class. Program will exit. I really don't understand why this is happening. Louis Wasserman The $ classes are for anonymous inner classes and perfectly normal. Could we see the command line you ran? You probably need to write java MainFile instead of java MainFile.class . 来源： https:

How do I access instance variables from inside the anonymous class's method ? class Tester extends JFrame { private JButton button; private JLabel label; //..some more public Tester() { function(); // CALL FUNCTION } public void function() { Runnable r = new Runnable() { @Override public void run() { // How do I access button and label from here ? } }; new Thread(r).start(); } } How do I access instance variables from inside the anonymous class's method ? You simply access them if need be: class Tester extends JFrame { private JButton button; private JLabel label; //..some more public Tester()

I have encountered the following Java syntax that I don't recognize. This part is fine: public abstract class Stream<T> implements Iterator<T> { public boolean hasNext() { return true; } public void remove() { throw new RuntimeException("Unsupported Operation"); } } But this I don't get: Stream<Integer> ones = new Stream<Integer>() { public Integer next() { return 1; } }; while(true){ System.out.print(ones.next() + ", "); } What it is? This is providing an inline (anonymous) subclass of the Stream class. Functionally, it is the same as: public NewClass extends Stream { public Integer next() {