localnlambdas.java

import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;

public class Main {

    public Main() {
        
    }

    public static void main(String[] args) {
            Wee wee = new Wee();
            int a = wee.foo();
            System.out.println(a);
           
            List<Wee> weeList = new ArrayList<>();                        
            
            // local class
            class Foo { int calc() { return 55; } }            
            System.out.println(new Foo().calc());
            
            Function<Integer,Boolean> f = i -> Boolean.TRUE;
            System.out.println(f.apply(5));
            
            File file = new File(".");
            // FileName filter
            file.listFiles((File ff, String str) -> ff.isDirectory());                                    
            file.listFiles((ff,str) -> ff.isDirectory());
            // FileFilter            
            file.listFiles((File ff) -> ff.isDirectory());
            file.listFiles(ff -> ff.isDirectory());
            file.listFiles(File::isDirectory);

            Arrays.asList(4,3,2,1).stream().forEach(x -> System.out.println(x));
            Arrays.asList(4,3,2,1).forEach(x -> System.out.println(x));
    }

}