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JAVA I/O
File(String pathname) File(String parent, String child) File(File parent, String child) File file1 = new File(“D:\itheima\a.txt”);# file1 is a path. public boolean fileCreated=file1.createNewFile(); public boolean mkdir()...
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Java API
scanner system.in type InputStream Scanner sc = new Scanner(System.in); int i = sc.nextInt(); random Random bount=new Random(); int a = bount.nextInt(100); JFrame JFrame() void setVisible(boolean...
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JAVA I/O
File(String pathname) File(String parent, String child) File(File parent, String child) File file1 = new File(“D:\itheima\a.txt”);# file1 is a path. public boolean fileCreated=file1.createNewFile();...
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Java API
scanner system.in type InputStream Scanner sc = new Scanner(System.in); int i = sc.nextInt(); random Random bount=new Random(); int a = bount.nextInt(100); JFrame...
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Linux Tools
Regex: Regex for playground – IHateRegex Json: Best JSON Formatter and JSON Validator: Online JSON Formatter Best JSON Viewer and JSON Beautifier...
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Linux Commond
[Rootuser@hostname]#/$root/other user Command option (arguments) Remove a file forcefully:rm -f /tmp/ddd.txt Manual:man Ctrl+A/E move cursor to the beginning/end of the line. Clear...
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AWS lightsail fee
Be aware of any unused static IPs. These will generate charges. An alert should be created to prevent accidental charging. If you...
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systemctl
Recover service after using systemctl disable: ‘Systemctl enable’ will useless. OR reboot and When mask a service, reboot and start will not...
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