this looks like a school assignment ;) > -----Original Message----- > From: Oliver Jonas [mailto:[EMAIL PROTECTED] > Sent: 02 December 2004 15:00 > To: [EMAIL PROTECTED] > Subject: JSP: final variable value lost in anonynous inner class > > > Hi, > > > > I have the following test JSP (see below.) When I use the > final variable > obtained by class A inside an anonymous subclass of B the > values are lost. > However, if I define the final variables' values directly > without using > class A it works. Both cases work fine when using this as a > normal Java > class, so it seems related to JSP's or Tomcat. > > > > The catalina.out output is: > > > > 1/ str1=str1 > > 1/ str2=str2 > > 1/ i1=1234 > > 1/ i2=1234 > > 2/ str1=null > > 2/ str2=str2 > > 2/ i1=0 > > 2/ i2=1234 > > a == null > > > > This is Tomcat 4.1.30 with VM 1.4.2_06. > > > > > > Do you know what is wrong or how to bypass this? > > > > Thanks, > > Oliver. > > > > <%! > > public static class A > > { > > private String s; > > private int i; > > > > public A() { > > s = "str1"; > > i = 1234; > > } > > > > public String getS() { > > return s; > > } > > > > public int getI() { > > return i; > > } > > } > > > > public A getA() { > > return new A(); > > } > > > > public static abstract class B > > { > > public B() > > { > > run(); > > } > > > > public abstract void run(); > > } > > > > public B getB() > > { > > final A a = getA(); > > > > final String str1 = a.getS(); > > final String str2 = "str2"; > > > > final int i1 = a.getI(); > > final int i2 = 1234; > > > > System.out.println("1/ str1=" + str1); > > System.out.println("1/ str2=" + str2); > > System.out.println("1/ i1=" + i1); > > System.out.println("1/ i2=" + i2); > > > > return new B() > > { > > public void run() > > { > > > System.out.println("2/ > str1=" + str1); > > System.out.println("2/ > str2=" + str2); > > > > > System.out.println("2/ i1=" > + i1); > > > System.out.println("2/ i2=" > + i2); > > > > if(a == null) > System.out.println("a == null"); > > } > > }; > > } > > %> > > > > <% > > getB(); > > %> > > > >
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