{"id":26958,"date":"2021-05-06T23:10:04","date_gmt":"2021-05-07T03:10:04","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/recent-posts\/urltest-java-demonstrates-try-catch-blocks-programming-code-examples-java-j2ee-j2me-basic-java\/"},"modified":"2021-05-06T23:10:04","modified_gmt":"2021-05-07T03:10:04","slug":"urltest-java-demonstrates-try-catch-blocks-programming-code-examples-java-j2ee-j2me-basic-java","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=26958","title":{"rendered":"URLTest.java Demonstrates try\/catch blocks. #Programming Code Examples #Java\/J2EE\/J2ME #Basic Java"},"content":{"rendered":"
\n\/** Taken from Core Web Programming from \n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.  \n *\/\n \n \/\/ Further simplified getURL method. \n \n public URL getURL() {\n    if (url != null) {\n      return(url);\n    }\n    System.out.print("Enter URL: ");\n    System.out.flush();\n    BufferedReader in = new BufferedReader(\n                          new InputStreamReader(System.in));\n    String urlString = null;\n    try {\n      urlString = in.readLine();\n      url = new URL(urlString);\n    } catch(MalformedURLException mue) {\n      System.out.println(urlString + " is not valid.n" +\n                        \t\t "Try again.");\n      getURL();\n    } catch(IOException ioe) {\n      System.out.println("IOError when reading input: " + ioe);\n      ioe.printStackTrace(); \/\/ Can skip return(null) now\n    } finally {\n      return(url);\n    }\n  }\n<\/pre>\n
\nimport java.net.*; \/\/ For URL, MalformedURLException\nimport java.io.*;  \/\/ For BufferedReader\n\n\/** A small class to demonstrate try\/catch blocks.\n *\n *  Taken from Core Web Programming from\n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.\n *\/\n\npublic class URLTest {\n  public static void main(String[] args) {\n    URLTest test = new URLTest();\n    test.getURL();\n    test.printURL();\n  }\n\n  private URL url = null;\n\n  \/** Read a string from user and create a URL from it. If\n   *  reading fails, give up and report error. If reading\n   *  succeeds but URL is illegal, try again.\n   *\/\n\n  public URL getURL() {\n    if (url != null) {\n      return(url);\n    }\n    System.out.print("Enter URL: ");\n    System.out.flush();\n    BufferedReader in = new BufferedReader(\n                          new InputStreamReader(System.in));\n    String urlString;\n    try {\n      urlString = in.readLine();\n    } catch(IOException ioe) {\n      System.out.println("IOError when reading input: " + ioe);\n      ioe.printStackTrace(); \/\/ Show stack dump.\n      return(null);\n    }\n    try {\n      url = new URL(urlString);\n    } catch(MalformedURLException mue) {\n      System.out.println(urlString + " is not valid.n" +\n                         "Try again.");\n      getURL();\n    }\n    return(url);\n  }\n\n  \/** Print info on URL. *\/\n\n  public void printURL() {\n    if (url == null) {\n      System.out.println("No URL.");\n    } else {\n      String protocol = url.getProtocol();\n      String host = url.getHost();\n      int port = url.getPort();\n      if (protocol.equals("http") && (port == -1)) {\n        port = 80;\n      }\n      String file = url.getFile();\n      System.out.println("Protocol: " + protocol +\n                         "nHost: " + host +\n                         "nPort: " + port +\n                         "nFile: " + file);\n    }\n  }\n}\n<\/pre>\n
\n\/** Taken from Core Web Programming from \n *  Prentice Hall and Sun Microsystems Press,\n *  .\n *  © 2001 Marty Hall and Larry Brown;\n *  may be freely used or adapted.  \n *\/\n \n  \/\/ Simplified getURL method.\n  \n  public URL getURL() {\n    if (url != null) {\n      return(url);\n    }\n    System.out.print("Enter URL: ");\n    System.out.flush();\n    BufferedReader in = new BufferedReader(\n                          new InputStreamReader(System.in));\n    String urlString = null;\n    try {\n      urlString = in.readLine();\n      url = new URL(urlString);\n    } catch(MalformedURLException mue) {\n      System.out.println(urlString + " is not valid.n" +\n                       \t\t\t "Try again.");\n      getURL();\n    } catch(IOException ioe) {\n      System.out.println("IOError when reading input: " + ioe);\n      ioe.printStackTrace(); \/\/ Show stack dump\n      return(null);\n    }\n    return(url);\n  }\n<\/pre>\n
Note: Brought from our old site: http:\/\/www.salearningschool.com\/example_codes\/ on Jan 2nd, 2017 From: http:\/\/sitestree.com\/?p=10218
 Categories:Programming Code Examples, Java\/J2EE\/J2ME, Basic Java
Tags:Java\/J2EE\/J2MEBasic Java
 Post Data:2017-01-02 16:04:23<\/p>\n
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\/** Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may be freely used or adapted. *\/ \/\/ Further simplified getURL method. public URL getURL() { if (url != null) { return(url); } System.out.print("Enter URL: "); System.out.flush(); BufferedReader in = … <\/p>\n
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