gistfile1.java

public class Test {

    interface Func {
        void call();
    }
    
    private void common(Func func) {
        // Common codes...
        
        func.call();
        
        // Common codes...
    }
    
    public void A() {
        common(new Func() {
            @Override
            public void call() {
                // A specified codes...
            }
        });
    }
    
    public void B() {
        common(new Func() {
            @Override
            public void call() {
                // B specified codes...
            }
        });
    }

}