public class TemplateMethodTest {
    public static void main(String[] args) {
        AbstractClass abstractClass = new SubClass();
        abstractClass.operation();
    }
}

abstract class AbstractClass{
    public void operation() {
        // 定义一个操作的算法骨架
        System.out.println(" step 1");
        System.out.println(" step 2");
        System.out.println(" step 3");
        //步骤延迟
        templateMethod();
    }

    protected abstract void templateMethod();
}
class SubClass extends AbstractClass {
    @Override
    protected void templateMethod() {
        System.out.println("subclass step");
    }
}