string - Setting static objects in java -

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मेरे पास एक वर्ग GlobalData 

  सार्वजनिक वर्ग GlobalData { सार्वजनिक स्थिर स्ट्रिंग SERVER_ROOT; सार्वजनिक स्थिर स्ट्रिंग LOGIN_JSP = GlobalData.SERVER_ROOT + "login.jsp"; सार्वजनिक स्थिर स्ट्रिंग HOME_JSP = GlobalData.SERVER_ROOT + "s / home.jsp"; सार्वजनिक स्थिर स्ट्रिंग लॉगआउट = GlobalData.SERVER_ROOT + "लॉगआउट"; सार्वजनिक स्थैतिक ServletContext SERVLET_CONTEXT; }   
 मैं संदर्भ से इन तारों को सेट करता हूं  
  GlobalData.SERVLET_CONTEXT = contextEvent.getServletContext (); GlobalData.SERVER_ROOT = GlobalData.SERVLET_CONTEXT.getContextPath () + "/"; System.out.println ("सेटिंग सर्वर रूट:" + GlobalData.SERVER_ROOT); System.out.println ("सेटिंग होम जेस्प:" + GlobalData.HOME_JSP); System.out.println ("सेटिंग लॉगिन:" + GlobalData.LOGIN_JSP); System.out.println ("सेटिंग लॉगआउट:" + GlobalData.Logout)   
  आउटपुट है:   
  सेटिंग सर्वर रूट : / JCMM / सेटिंग होम jsp: nulls / home.jsp सेटिंग लॉगिन: nulllogin.jsp सेटिंग लॉगआउट: nullLogout   
 मुझे यह व्यवहार नहीं समझ सकता जब कोई  GlobalData  वर्ग है, तो कोई भी पा सकते हैं, समस्या कहाँ है?   
 
 
 Intialized, सभी स्थिर चर सेट कर रहे हैं।  SERVER_ROOT  के लिए कोई मान नहीं है, इसलिए इसे  null  पर आरंभ किया जाता है। फिर अगले 3 चर को आरंभ किया जाता है। स्ट्रिंग को जोड़ने के लिए  +  का उपयोग करते समय,  स्ट्रिंग  "null" में एक  null  परिणाम होते हैं, इसलिए 3 मानों में से प्रत्येक  LOGIN_JSP ,  HOME_JSP , और  लॉगआउट  "null" से शुरू होता है।  
 बाद में, आप SERVER_ROOT सेट करते हैं, लेकिन आप अन्य 3 अपडेट नहीं करते हैं, इसलिए वे मोर्चे पर "अशक्त" के साथ तार के रूप में रहते हैं।

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