I'm trying to translate JavaScript code into Java code.

In JavaScript, interfaces can have attributes, and an interface can extend multiple interfaces:

interface Interface1 {
    name?: string
    age?: number
}

interface Interface2 {
    id?: string
}

interface InterfaceCombination extends Interface1, Interface2 {
    position?: string
}

I want to translate this JavaScript code into Java code. I have several ideas, but I don't know if they are good designs.

First idea: classes & delegation

Since Java interfaces only have final static attributes, I choose classes to maintain those attributes:

public class Class1 {
    private String name;
    private Number age;
    public String getName();
    public void setName(String name);
    ... // getter & setter for age
}

public class Class2 {
    private String id;
    ... // getter & setter for id 
}

However, there is the problem. A Java class can only extends one class, so I choose to use delegation:

public class ClassCombination {
    private Class1 class1;
    private Class2 class2;
    private String position;
    public String getName() {
        return class1.getName();
    }
    ... // getters & setters
}

This would lead to a lot of repeated work when the delegation hierarchy is deep. I tried to use @Delegate annotation in lombok, but this is experimental and doesn't support recursive delegation.

Second idea: interface & getters & setters

Though a Java class can only extend one class, a Java interface can extend multiple interfaces.

public interface Interface1 {
   public String getName();
   public void setName();
   ... // getter & setter for age
}

public interface Interface2 {
   ... // getter & setter for id
}

public interface InterfaceCombination extends Interface1, Interface2 {
   ... // getter & setter for position
}

This solution would lead to a heavy work on writing getters and setters in interfaces. And I cannot use lombok to automatically generate getters and setters in interfaces.

Is there any solution more elegant and easier to implement?