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问题：（1）定义成员变量：品牌（String brand），价格(double price)，颜色（String color）；（2）定义无参构造方法和带参构造方法，其中无参构造方法调用带参构造方法来初始化类中的变量；（3）定义私有成员变量age对应的get...

【Java每日一题】— —第二十七题：编程定义一个学生类Student

问题：（1）定义成员变量：姓名（String name），年龄（int age），性别(char sex)，其中name、sex为公有变量，age 为私有变量；（2）定义无参构造方法，带参构造方法；（3）定义私有成员变量age对应的getXxx()/setX...

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【Java每日一题】— —第二十六题：编程定义一个经理类Manager。

问题：编程定义一个经理类Manager。步骤如下：（1）定义成员变量：姓名（String name），年龄（int age），性别(String sex)、工资(double sal)；（2）定义无参构造方法，带参构造方法；（3）定义以上成员变量对应的ge...

【Java每日一题】第二十五题：编程定义一个员工类Employee。

问题：编程定义一个员工类Employee。步骤如下：（1）定义成员变量：姓名（String name），年龄（int age），性别(String sex)、工资(double sal)；（2）定义无参构造方法，带参构造方法；（3）定义以上成员变量对应的g...

【Java每日一题】— —第二十四题：编程定义一个长方形类Rectangle

问题：（1）定义成员变量：长（int height），宽（int width）；（2）定义无参构造方法，带参构造方法；（3）定义以上成员变量对应的getXxx()/setXxx()方法；以及一个显示所有成员信息的toString()方法；（4）定义求周长的zhouCh...

【Java每日一题】— —第二十一题：编程把现实生活的手机事物映射成一个标准类Phone，并定义一个测试类PhoneDemo测试Phone类的功能

问题： 1、编程把现实生活的手机事物映射成一个标准类Phone，并定义一个测试类PhoneDemo测试Phone类的功能。步骤如下：（1）定义手机类Phone及以下成员变量： ...

Java 编程问题：七、Java 反射类、接口、构造器、方法和字段4

Java 编程问题：七、Java 反射类、接口、构造器、方法和字段3https://developer.aliyun.com/article/1426148异常的泛型异常的泛型类型在TypeVariable或ParameterizedType实例中具体化。这一次，基于TypeVariable的泛型信...

Java 编程问题：七、Java 反射类、接口、构造器、方法和字段1

本章包括涉及 Java 反射 API 的 17 个问题。从经典主题，如检查和实例化 Java 工件（例如，模块、包、类、接口、超类、构造器、方法、注解和数组），到合成和桥接构造或基于嵌套的访问控制（JDK11），本章详细介绍了 Java 反射 API。在本章结束时，Java 反射 API 将不会有任...

Java 编程问题：七、Java 反射类、接口、构造器、方法和字段2

Java 编程问题：七、Java 反射类、接口、构造器、方法和字段1https://developer.aliyun.com/article/1426147从 JAR 实例化类假设我们在D:/Java Modern Challenge/Code/lib/文件夹中有一个 Guava JAR，我们想创建...

Java并发编程学习6-同步容器类和并发容器

《Java并发编程学习系列》引言本篇开始将要介绍 Java 平台类库下的一些最常用的并发基础构建模块，以及使用这些模块来构造并发应用程序时的一些常用模式。同步容器类同步容器类包括 Vector 和 Hashtable，还有由 Collections.synchronizedXxx 等工厂方...

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