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How do I convert an abstract class into an interface?
public abstact class Foo
{
    private int bar;

    public static final int SOME_CONSTANT = 42;

    public Foo(b) {
        this.bar = b;
    }

    public abstract void doSomething(String s);

    protected int doSomethingElse() {
        return this.bar * 2;
    }
}

public interface Foo
{
    int SOME_CONSTANT = 42;

    void doSomething(String s);
}

public abstact class AbstractFoo implements Foo
{
    private int bar;

    public Foo(b) {
        this.bar = b;
    }

    public abstract void doSomething(String s);

    protected int doSomethingElse() {
        return this.bar * 2;
    }
}

public abstract class SomeClass {
       // some code here
     public abstract void someMethod();
}

public interface TargetInterface {
     public void someMethodBlaBla();
}

public class Adapter implements TargetInterface {
   private SomeClass adaptee;

   public Adapter( SomeClass adaptee ) {
       this.adaptee = adaptee;
   }

   public void someMethodBlaBla() {
       this.adaptee.someMethod();
   }

   //delegate all calls to adaptee
}

SomeClass abstractClassInstance = ... //get instance of your abstract class
TargetInterface targetInterfaceInstance = new Adapter( abstractClassInstance );

public abstract class Abstract {
  public abstract void method();
  //...
}

public interface Interface {
  void method();
  //...
}