public abstract class AbstractParent {
    public AbstractParent() {
        System.out.println("Hello,parent");
    }

    protected void earnMoney() {
        prepare();
        doJob();
    }

    protected abstract void doJob();

    private void prepare() {
        System.out.println("parent prepare");
    }
}

class Child extends AbstractParent {
    public Child() {
        System.out.println("Child init");
    }

    @Override
    protected void doJob() {
        System.out.println("Child do job");
    }

    public static void main(String[] args) {
        Child child = new Child();
        child.earnMoney();
    }
}