Java语言概述

/**
 * CrossPlatformDemo.java
 * 演示：同一份Java代码在不同操作系统上的输出完全一致
 * 场景：飞翔科技技术部验证Java跨平台能力
 */
public class CrossPlatformDemo {
    public static void main(String[] args) {
        // 获取当前操作系统信息
        String osName = System.getProperty("os.name");
        String osArch = System.getProperty("os.arch");
        String javaVersion = System.getProperty("java.version");
        String javaVendor = System.getProperty("java.vendor");

        // 飞翔科技公司数据
        String companyName = "广州飞翔科技";

        System.out.println("═══════════════════════════════════");
        System.out.println("   " + companyName);
        System.out.println("   Java 跨平台验证报告");
        System.out.println("═══════════════════════════════════");
        System.out.println("操作系统名称 : " + osName);
        System.out.println("操作系统架构 : " + osArch);
        System.out.println("Java 版本    : " + javaVersion);
        System.out.println("Java 厂商    : " + javaVendor);
        System.out.println("───────────────────────────────────");
        System.out.println("Java 运行时可用处理器数 : " + Runtime.getRuntime().availableProcessors());
        System.out.println("Java 虚拟机最大内存(MB) : " + Runtime.getRuntime().maxMemory() / 1024 / 1024);
        System.out.println("───────────────────────────────────");

        // 跨平台核心验证：以下代码在任何OS上输出完全一致
        int empCount = 12;          // 飞翔科技员工总数
        double revenue = 8888.88;   // 示例数据
        String slogan = "愿你朝华相顾，愿你前程似锦。";

        System.out.println("公司员工总数 : " + empCount);
        System.out.println("示例营收数据 : ¥" + revenue);
        System.out.println("企业寄语     : " + slogan);
        System.out.println("═══════════════════════════════════");
    }
}

import java.util.*;

/**
 * TeamListDemo.java
 * 演示：JDK 8 Lambda 表达式 + Stream API 的简洁性
 * 场景：小崔整理飞翔科技技术部员工名单
 */
public class TeamListDemo {
    public static void main(String[] args) {
        // 飞翔科技技术部员工名单（姓名，职位，年龄）
        String[][] techTeam = {
            {"大翔", "CEO/CTO", "32"},
            {"白歌", "架构师", "29"},
            {"小崔", "后端开发", "25"},
            {"黄俪", "前端开发", "24"},
            {"李眉", "运维工程师", "28"},
        };

        System.out.println("═══════════════════════════════════");
        System.out.println("   飞翔科技 · 技术部花名册");
        System.out.println("═══════════════════════════════════");

        // JDK 8 之前：传统 for 循环打印
        System.out.println("\n【传统方式：for-i 循环】");
        for (int i = 0; i < techTeam.length; i++) {
            System.out.println("  " + techTeam[i][0] + " - " + techTeam[i][1]
                    + "（" + techTeam[i][2] + "岁）");
        }

        // JDK 8：Lambda 表达式 + forEach
        System.out.println("\n【JDK 8 方式：Lambda + forEach】");
        Arrays.stream(techTeam)
              .forEach(member -> System.out.println(
                  "  " + member[0] + " - " + member[1] + "（" + member[2] + "岁）"
              ));

        // JDK 8：Stream API 过滤 + 排序（找出30岁以下的员工，按姓名排序）
        System.out.println("\n【JDK 8 Stream：30岁以下青年员工】");
        Arrays.stream(techTeam)
              .filter(member -> Integer.parseInt(member[2]) < 30)
              .sorted(Comparator.comparing(member -> member[0]))
              .forEach(member -> System.out.println(
                  "  " + member[0] + " - " + member[1] + "（" + member[2] + "岁）"
              ));

        System.out.println("\n  愿你朝华相顾，愿你前程似锦。");
        System.out.println("═══════════════════════════════════");
    }
}