一起遨游网

windows11官方下载：https://www.microsoft.com/zh-cn/software-download/windows11

https://software-download.microsoft.com/sg/Win11_Chinese(Simplified)_x64.iso?t=8b64462a-83a8-4d5a-850f-5a304413e7af&e=1633607470&h=96423be629d0c948ec0e68c540b54a01

下载安装前看看自己CPU跟硬件是否符合~

这里还是不推荐先使用，希望用安卓的可以尝试，但是国内似乎还不能用！

MVS订阅中心简体中文版（含标准版、标准桌面体验版、数据中心版、数据中心桌面体验版）
64位版本：Windows Server 2022 Standard、Windows Server 2022 Standard (Desktop Experience)、Windows Server 2022 Datacenter、Windows Server 2022 Datacenter (Desktop Experience) (4in1) (x64) - DVD (Chinese-Simplified)
文件名称: zh-cn_windows_server_version_2022_updated_sep_2021_x64_dvd_b4b9f360.iso（4.88G）
SHA-256: C63B9B982467E2A097F8BE510885B91B8BCC81C3E0767FEDEC0D878789515858

ed2k://|file|zh-cn_windows_server_version_2022_updated_sep_2021_x64_dvd_b4b9f360.iso|5239418880|F683A7A81A87B17552AD3F31AD667633|/

VLSC订阅中心简体中文版（含标准核心版、标准数据中心核心版） //批量授权
64位版本：Windows Server Standard Core 2022、Windows Server Datacenter Core 2022 (2in1) (x64) - DVD (Chinese-Simplified)
文件名称: zh-cn_windows_server_version_2022_updated_sep_2021_x64_dvd_d125a8d5.iso（4.88G）
SHA-256: 4D137F19764982F23D8660F83A842A106D43C9B6B4C13055C176947473ADF3ED

ed2k://|file|zh-cn_windows_server_version_2022_updated_sep_2021_x64_dvd_d125a8d5.iso|5240166400|1F8B4C146B58ABC2C142C259F6B122B4|/

https://www.debian.org/CD/http-ftp/#stable

Windows 10 (business editions), version 21H2 (updated May 2022) (x64) - DVD (Chinese-Simplified)

ed2k://|file|zh-cn_windows_10_business_editions_version_21h2_updated_may_2022_x64_dvd_3e40125e.iso|5804613632|7E0B252E786FA54ADCCD0D24D1BA943A|/

Windows 10 (consumer editions), version 21H2 (updated May 2022) (x64) - DVD (Chinese-Simplified)

ed2k://|file|zh-cn_windows_10_consumer_editions_version_21h2_updated_may_2022_x64_dvd_97a670d9.iso|5928056832|68D43DA9180BB68671F185694219749D|/

Windows 10 Enterprise LTSC 2021 (x64) - DVD (Chinese-Simplified)

ed2k://|file|SW_DVD9_WIN_ENT_LTSC_2021_64BIT_ChnSimp_MLF_X22-84402.ISO|5044211712|1555B7DCA052B5958EE68DB58A42408D|/

``` package 数学相关类; import java.math.BigDecimal; public class BigDecimalDemo { public static void main(String[] args) { // float和double都不能表示精确的小数，此时使用BigDecimal // TODO Auto-generated method stub System.out.println("0.09 + 0.01 ="+(0.09+0.01)); System.out.println("1.00 - 0.33 ="+(1.00-0.33)); // // BigDecimal b1 = new BigDecimal(0.09); // BigDecimal b2 = new BigDecimal(0.01); // // 0.1 ? // System.out.println(b1.add(b2));　因为在0.09是double类型，创建b1就已经不精确了 BigDecimal b1 = new BigDecimal("0.09"); BigDecimal b2 = new BigDecimal("0.01"); System.out.println(b1.add(b2)); BigDecimal b3 = new BigDecimal("0.0123"); System.out.println(b3.scale());// 4 // 除法 BigDecimal b4 = new BigDecimal("1."); BigDecimal b5 = new BigDecimal("3.00"); // System.out.println(b4.divide(b5));// 如果是1.0 / 3.0 ,报异常java.lang.ArithmeticException //divide(b5,有效位数,舍入规则) System.out.println(b4.divide(b5,5,BigDecimal.ROUND_FLOOR)); // b4.compareTo(b5) 比较 -1(b6b7) BigDecimal b6 = new BigDecimal("3.14"); BigDecimal b7 = new BigDecimal("3.1450"); System.out.println(b6.compareTo(b7)); System.out.println(b6.equals(b7)); } } ```

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