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A quick-starting tool to view java system properties

/ Published in: Java
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* list all system properties
* list a specific property

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  1. import java.util.Properties;
  2. import java.util.Scanner;
  3.  
  4. public class SysPropsTool {
  5.   public static final String QUIT = "/Q";
  6.   public static final String QUIT_ = "/QUIT";
  7.   public static final String HELP = "/?";
  8.   public static final String HELP_ = "/H";
  9.   public static final String HELP__ = "/HELP";
  10.   public static final String LIST = "/LS";
  11.   public static final String LIST_ = "/LIST";
  12.   public static final String LISTALL = "/ALL";
  13.  
  14.   public static final String PROPS = "props >>>";
  15.  
  16.   static Properties props = System.getProperties();
  17.   public static void main (String[] args) {
  18.     //props = System.getProperties();
  19.     usageInfo();
  20.  
  21.     Scanner sc = new Scanner(System.in);
  22.  
  23.  
  24.     while (true) {
  25.       System.out.print(PROPS);
  26.       try {
  27.         String line = sc.nextLine();
  28.  
  29.         if (line == null || line.length() < 1) {
  30.           continue;
  31.         }
  32.         String preStic = line.trim().toUpperCase();
  33.  
  34.         if (QUIT.equals(preStic) || QUIT_.equals(preStic)) {
  35.           break;
  36.         }
  37.  
  38.         if (HELP.equals(preStic) || HELP_.equals(preStic) || HELP__.equals(preStic)) {
  39.           usageInfo();
  40.           continue;
  41.         }
  42.  
  43.         boolean isList = LIST.equals(preStic) || LIST_.equals(preStic) || LISTALL.equals(preStic);
  44.         if (isList) {
  45.           showAll();
  46.           System.out.println("-- listed over --");
  47.         }else {
  48.           showIndivl(line);
  49.         }
  50.  
  51.  
  52.       }catch (Exception ex) {
  53.  
  54.         usageInfo();
  55.       }
  56.     }
  57.  
  58.   }
  59.  
  60.   static void showAll () {
  61.     if (props != null) {
  62.       props.list(System.out);
  63.     }
  64.   }
  65.  
  66.   static void showIndivl (String key) {
  67.     String value = props.getProperty(key, "[NAN]");
  68.     StringBuilder info = new StringBuilder(key);
  69.     info.append("=").append(value);
  70.  
  71.     System.out.println(info);
  72.   }
  73.  
  74.   public static String get (String key) {
  75.     return props.getProperty(key);
  76.   }
  77.  
  78.   public static Properties set (String key, String value) {
  79.     props.setProperty(key, value);
  80.     return props;
  81.   }
  82.  
  83.   static void usageInfo () {
  84.     System.out.println("[Usage]: \n\t [/q|/quit]:\t to quit \n\t [/ls|/list|/all]:\t to list all props \n\t {key}:\t get the key-value \n\t [/h|/?|/help]:\t for help");
  85.   }
  86. }

URL: http://ideone.com/GqJJJi

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