Java 10 Cleaner

a.java

public class InstanceAroundResource implements AutoCloseable{
    //(1)We will delegeta cleaning to Cleaner from Java 9
    private static final Cleaner cleaner=Cleaner.create();

    //(2)This is definition of internal state, static -> so it has no ref to external instance
    //private - to better hide information
    private static class EncapsulatedResource implements Runnable{
       (...)
    }

    //(3)no getters for those two fields, no strange hakiers annotations either
    private final EncapsulatedResource state;

    //this triggers cleaning procedure
    private final Cleaner.Cleanable cleanable;

    public InstanceAroundResource(String resourceId) {
        //(4)notice that both instances are created inside constructor , no direct assignment,
        //no information how resourceId is escapes outside 
        //compare this with stntaxt 'this.field = field' which is hiding information like in the sentence 
        // "think about number seven but don't tell what the number is"
        this.state = new EncapsulatedResource("[opened :"+resourceId+"]");
        this.cleanable = cleaner.register(this, state);
    }

    //(5) here we are connecting Cleaner with Autocloseable from Java7
    @Override
    public void close() throws Exception {
        cleanable.clean();
    }
}