ohcibi · December 17, 2015 10:59
diff --git a/A.java b/A.java
 public abstract Class A {
    public B b;

    public A(B b) {
        this.b = b;
    }
 }
diff --git a/B.java b/B.java
 public abstract Class B {

 }
diff --git a/ConcreteA.java b/ConcreteA.java
 public class ConcreteA extends A {
    public ConcreteB b;

    public ConcreteA(ConcreteB b) {
        super(b);
    }
 }
diff --git a/ConcreteB.java b/ConcreteB.java
 public class ConcreteB extends B {
 }
diff --git a/Main.java b/Main.java
 //....

 ConcreteB b = new ConcreteB();
 ConcreteA a = new ConcreteA(b);

 //....
	public class ConcreteA extends A {
	public ConcreteB b;

	public ConcreteA(ConcreteB b) {
	super(b);
	}
	}