Preinitialization Pattern in Java 8 - Example 1

A.java

public class A {
    
    public A(Runnable preinitialization) {
        preinitialization.run();
        initializeUsingSubclassMethod();
    }
    
}

B.java

public class B extends A {
    
    private String variable;
    
    public B(String variable) {
        super(() -> {
            this.variable = variable;
        });
    }
    
    public void methodUsedBySuper() {
        // do something with variable
    }
    
}