shelajev

package org.shelajev.throwaway.defmeth;

public class Main {
  public static void main(String[] args) {
    // what does this program produce? 
    B b = new B();
    b.m1();
    b.callM1(); 
    b.callSuperM1(); 
  }

shelajev

package org.shelajev;

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello World!");
    Thread t = new Thread();
    int a = countInstances(Thread.class);
    System.out.println("There are " + a + " instances of " + Thread.class);
  }

shelajev

# http://bramp.github.io/js-sequence-diagrams/
DSU solution->Genrih: notifies about upcoming update
Genrih->>DSU solution: request changed classes
DSU solution->Genrih: provides changed classes
Genrih->Diff tool: old code, new code
Diff tool->>Genrih: list of changes 
Note right of Genrih: changes => potential phenomena
Genrih->Oracle: list of phenomena
Oracle->Runtime: queries state
Runtime->>Oracle: state information

shelajev

@RestController
class ThisWillActuallyRun {
    @RequestMapping("/")
    String home() {
        return "Hello World!"
    }
}

shelajev

public class Foo {
    private String bar;
    private int number;

    public Foo() {
        // Do some stuff
    }

    public String getBar() { return this.bar; }

shelajev

//Default methods in interfaces
@FunctionalInterface
interface Utilities {
  default Consumer<Runnable> m() {
    return (r) -> r.run();
  }
  // default methods, still functional
  Object function(Object o); 
}
  

shelajev

public interface Debuggable {
  default String debug() {
    StringBuilder sb = new StringBuilder(this.getClass().getName());
    sb.append(" [ ");
    Field[] fields = this.getClass().getDeclaredFields();
    for(Field f: fields) {
      f.setAccessible(true);
      try {
        sb.append(f.getName() + " = " + f.get(this));
        sb.append(", ");

shelajev

class ExampleActor extends AbstractActor {
  // this child will be destroyed and re-created upon restart by default
  final ActorRef other = getContext().actorOf(new Props(OtherActor.class), "childName");

  public ExampleActor() {
    receive(ReceiveBuilder
      .match(Request1.class, r -> 
        other.tell(r.getMsg(), self())
      )
      .match(Request2.class, r -> 

shelajev

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {

  @Override
  public void onClick(View view) {
    Snackbar.make(view, “Super fast hello world”, Snackbar.LENGTH_LONG)
      .setAction(“Action”, null).show();
  }
});

shelajev

compile ‘com.squareup.retrofit2:retrofit:2.0.0-beta2’
compile ‘com.squareup.retrofit2:gson-converter:2.0.0-beta2’