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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:The seaside also watched the program performance at night. The handsome boy's space walk was really amazing and worth seeing!七月一日飞虎队员聪（吕颂贤饰）因奋勇抗匪受伤，又遭余党伏击，遂被调派坪洲静养。聪初到坪洲警局，对一众警员棋（李龙基饰）、伟（莫家尧饰）及辉（蒋克饰）等的懒散表现，深感不满。另一方面，又与村民发生摩擦，惹来不少投诉，幸得茶餐厅老板娘玉（黄恺欣饰）体谅开解。原来玉乃聪寻访多年的亲母，后经聪祖母云（罗兰饰）安排，母子终可相认。聪在受伤期间，结识任职补习社的芝（潘芝莉饰），并共堕爱河，惜终因彼此意见分歧而分开。聪不久与杂货店老板心（宣萱饰）由冤家发展成情侣，更与其兄顺（郭晋安饰）成为好友，却万料不及，顺竟是匪党之一！后顺为了家人安全，又得女友芝支持，决自首改过。心以为可与聪一起，无奈却又出现一个不惜舍身为聪的琴（袁彩云饰）……Dad Lao Jin两人正说话，葡萄姑姑就走进来。任职于律政署监控的唐志高（马浚伟 饰）主要事情是处理一些诸如随地吐痰、违章驾驶的事情。为了能大展拳脚，他申请调去政府做律师。志高的父亲大海非常支持儿子的工作，但另一方面，大海赌瘾很大，本来以为下了注赌马大赚一笔就可以弥补之前的欠款，可谁知这笔堵注是非法的。赌赢的钱不翼而飞，被追的债只有儿子志高来偿还。志高动用了本来要买房的资金，这让大海愧疚不已，不久选择离开人世。而成为律师的志高因为一次诬蔑被罢免职务。因为和某一服装集团主席的侄子童日进（吴卓羲 饰）相识且结为挚友，于是被引入该工资做法律顾问。而志高也和初恋女友徐颖（廖碧儿 饰）相逢。