关于java的那些事

亲测、

public class A implements D {
    public int id;
    public int name;
    public int a;

    public int getId() {
        return id;
    }
    @Override
    public void setId(int id) {
        this.id = id;
    }

    public int getName() {
        return name;
    }

    @Override
    public void setName(int name) {
        this.name = name;
    }

    public int getA() {
        return a;
    }

    public void setA(int a) {
        this.a = a;
    }

    public static void main(String[] args) {
        A a = new A();
        a.setId(1);
        save(a);
    }

    private static void save(D a) {

    }


}

```java
public class B implements D {
    public int id;
    public int name;
    public int b;

    public int getId() {
        return id;
    }

    @Override
    public void setId(int id) {
        this.id = id;
    }

    public int getName() {
        return name;
    }

    @Override
    public void setName(int name) {
        this.name = name;
    }

    public int getB() {
        return b;
    }

    public void setB(int b) {
        this.b = b;
    }
}

public interface D {
    void setId(int id) ;

    void setName(int name);




}