Java and JavaScript comparison of hollow values and strings

JavaScript text box input value is null judgment

Verify that the name and date are NOT NULL function Checksave () {var Sname=document.getelementbyid ("Sname"). Value;var stime= document.getElementById ("dateTimePicker1"). Value;var Etime=document.getelementbyid ("Datetimepicker2"). Value;if ( sname== "") {alert ("Name cannot be empty!"); return false;} if (stime== "") | | (etime== "")) {alert ("Start or end time cannot be empty!"); return false;}}

string comparison in Java equals

if  ("". Equals (Product.getname ())  ) {                         if (product.getSmallClassId () == -9999) {                                   Specialvos= specialservice.getspecialvos (Special.getid ());                              }else{                                  Specialvos= specialservice.getspecialvos (Special.getid (), Product.getsmallclassid ());                              }        }

Non-string type

if (Special.getid () ==null) {Special.setid (IDGENERATOR.INCR (Special.class));                Special.setcreatedate (New Date ());                Special.setcreateuser ((long) 110);                Specialservice.savespecial (special); }

in struct

Background String type value if the foreground input box is not filled in empty, then the background is the empty string "", when judged with equals

Background non-string value if the foreground input box is left blank, then the background is null, when judged by = =

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Java and JavaScript comparison of hollow values and strings