概述
通过本文的引导，深入探究Java基础、面向对象编程、集合框架和面试技巧，进而实战构建个人简历展示系统，全面提升Java技能，为简历增添实战项目经验，助你在求职路上脱颖而出。
代码展示与完整性的提升面向对象编程基础：类与对象
类与对象的概念
public class Person {
private String name;
private int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public void greet() {
System.out.println("Hi, my name is " + this.name + " and I'm " + this.age + " years old.");
}
}封装与方法
public class PersonExample {
public static void main(String[] args) {
Person person = new Person("John Doe", 25);
person.greet();
}
}Java 集合框架
常用集合类
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
public class CollectionExample {
public static void main(String[] args) {
// ArrayList 示例
ArrayList<String> names = new ArrayList<>();
names.add("Alice");
names.add("Bob");
names.add("Charlie");
for (String name : names) {
System.out.println(name);
}
// HashMap 示例
HashMap<String, Integer> scores = new HashMap<>();
scores.put("Alice", 90);
scores.put("Bob", 85);
scores.put("Charlie", 95);
Iterator<String> iterator = scores.keySet().iterator();
while (iterator.hasNext()) {
String name = iterator.next();
System.out.println(name + ": " + scores.get(name));
}
// 遍历集合的另一种方式
scores.forEach((k, v) -> System.out.println(k + ": " + v));
}
}代码优化与性能调优
使用缓存的示例
import java.util.concurrent.ConcurrentHashMap;
public class CacheExample {
private static final ConcurrentHashMap<String, String> cache = new ConcurrentHashMap<>();
public static String getValue(String key) {
String value = cache.get(key);
if (value == null) {
value = "Not in cache: " + key;
cache.put(key, value);
}
return value;
}
public static void main(String[] args) {
System.out.println(getValue("key1")); // "Not in cache: key1"
System.out.println(getValue("key2")); // "Not in cache: key2"
System.out.println(getValue("key1")); // "Not in cache: key1" (再次访问时，不会执行计算)
}
}项目实战：个人简历展示系统
需求分析与设计
import java.util.List;
import java.util.Map;
public class Resume {
private String name;
private List<Experience> workHistory;
private Map<String, String> skills;
public Resume(String name, List<Experience> workHistory, Map<String, String> skills) {
this.name = name;
this.workHistory = workHistory;
this.skills = skills;
}
public String getName() {
return name;
}
public List<Experience> getWorkHistory() {
return workHistory;
}
public Map<String, String> getSkills() {
return skills;
}
}
public class Experience {
private String position;
private String company;
private String startDate;
private String endDate;
public Experience(String position, String company, String startDate, String endDate) {
this.position = position;
this.company = company;
this.startDate = startDate;
this.endDate = endDate;
}
// 添加getter和setter方法
}HTML 模板设计
<!DOCTYPE html>
<html>
<head>
<title>Jane Doe's Resume</title>
</head>
<body>
<h1>Jane Doe</h1>
<p>Personal Information</p>
<ul>
<li>Name: Jane Doe</li>
<li>Email: jane.doe@example.com</li>
<li>Phone: (555) 123-4567</li>
</ul>
<h2>Work Experience</h2>
<ul>
<li>
<h3>Software Engineer</h3>
<p>ABC Inc.</p>
<p>June 2019 - Present</p>
</li>
<!-- 重复上述结构以展示更多工作经验 -->
</ul>
<h2>Skills</h2>
<ul>
<li>Java</li>
<li>Python</li>
<li>JavaScript</li>
<!-- 添加更多技能项 -->
</ul>
</body>
</html>测试与部署
测试策略
import org.junit.jupiter.api.Test;
// 假设这里导入了所需的测试框架包
import static org.junit.jupiter.api.Assertions.*;
class ResumeTest {
@Test
void testResume() {
// 实例化Resume类，并进行测试
Resume resume = new Resume("Jane Doe", /* 工作经历 */, /* 技能 */);
assertEquals("Jane Doe", resume.getName());
// 更多的测试用例...
}
}部署方案
// 假设这里描述了如何使用Apache Tomcat部署Java Web应用通过遵循上述指南，从基础概念到实战项目，你可以系统地学习Java，并在简历中展示自己的项目经验。在实际项目开发过程中，持续学习和实践是成长的关键。
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