在看Tomcat启动源码的时候,涉及到模板设计模式,不学模板设计模式,简直有点看不懂,学完了,也明白了,就是把公共的方法放在父类,然后父类调用子类的实现
我自己写的
仿着Tomcat写的
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public interface Lifecycle {
void init();
}
abstract class AbstractLifecycle implements Lifecycle{
abstract void run();
@Override
public void init() {
System.out.println("这里是公共方法");
run();
System.out.println("这里也是公共方法");
}
}
public class ServerStandard extends AbstractLifecycle {
@Override
void run() {
System.out.println("我是实现,父类将调用我");
}
}
public class ServerStandard2 extends AbstractLifecycle {
@Override
void run() {
System.out.println("我是实现2,父类将调用我");
}
}
public class Test {
public static void main(String[] args) {
ServerStandard serverStandard = new ServerStandard();
serverStandard.init();
System.out.println("============================================");
ServerStandard2 serverStandard2 = new ServerStandard2();
serverStandard2.init();
}
}
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别人的例子
https://juejin.im/post/6844903520844382215