Java的抽象使用2

Java的抽象使用2

package com.hspedu.abstractUse;
 
public class TestTemplate {
    public static void main(String[] args) {
        AA aa = new AA();
        aa.calculateTime();
 
        BB bb = new BB();
        bb.calculateTime();
    }
}
 
abstract class Template {
    public abstract void job();
 
    public void calculateTime(){
        long start = System.currentTimeMillis();
        job();
        long end = System.currentTimeMillis();
        System.out.println("任务执行时间" + (end - start));
    }
}
 
class AA extends Template{
    @Override
    public void job() {
        long sum = 0;
        for (long i = 1; i < 10000000; i++) {
            sum *= i;
        }
    }
}
 
class BB extends Template{
    @Override
    public void job() {
        long sum = 0;
        for (long i = 1; i < 20000000; i++) {
            sum *= i;
        }
    }
}