Luojiale 3557013fe8 Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry		3 weeks ago
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Box.class	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
Box.java	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
GenericDemo.class	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
GenericDemo.java	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
GenericUtils.class	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
GenericUtils.java	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
Pair.class	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
Pair.java	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago
README.md	Add w5 to w11 projects: shape inheritance, animal interface, exception handling, generics, maven project, repository with analyze command, exception hierarchy with retry	3 weeks ago

README.md

Java 泛型类练习

本项目包含几个典型的 Java 泛型类练习，展示了泛型的使用方法。

文件结构

Box.java - 简单的泛型容器类
Pair.java - 存储键值对的泛型类
GenericUtils.java - 包含泛型方法的工具类
GenericDemo.java - 演示程序
README.md - 本文档

泛型类概述

Box

一个简单的泛型容器类，可以存储任意类型的对象。

使用单个类型参数 T
提供构造函数、getter、setter 方法
判断是否为空的方法

Pair<K, V>

一个存储键值对的泛型类，可以存储两个不同类型的对象。

使用两个类型参数 K 和 V
提供构造函数和 getter/setter 方法

GenericUtils

一个包含泛型方法的工具类，展示了如何创建和使用泛型方法。

printArray: 打印任意类型数组的元素
swap: 交换数组中的任意两个元素
countListElements: 计算列表中的元素数量

编译运行

# 编译所有 Java 文件
javac Box.java Pair.java GenericUtils.java GenericDemo.java

# 运行演示程序
java GenericDemo

运行结果

程序会展示泛型类的各种用法，包括：

Box 类存储不同类型的数据
Pair 类存储键值对
GenericUtils 的泛型方法的使用

泛型的主要优点

类型安全：编译时检查，避免运行时类型错误
代码复用：一套代码支持多种数据类型
可读性：更清晰的代码，更易理解
避免强制类型转换：减少代码中的类型转换