When concatentation strings, jdb doesn't perform string conversion as
required by the Java rules for evaluating expressions.

frog:~/workspaces/test/jdbnontop $ ls -la
total 4
drwxr-xr-x 2 gafter 512 Oct 8 09:25 .
drwxr-xr-x 63 gafter 1536 Oct 8 09:16 ..
-rw-r--r-- 1 gafter 0 Oct 8 09:21 .jdbrc
-rw-r--r-- 1 gafter 303 Oct 8 09:19 T.java
frog:~/workspaces/test/jdbnontop $ cat -n T.java
     1 class T {
     2 String s;
     3 void f() {
     4 new T("f").g();
     5 }
     6 void g() {
     7 new T("g").h();
     8 }
     9 void h() {
    10 System.out.println(s);
    11 }
    12 public static void main(String[] args) {
    13 new T("main").f();
    14 }
    15 T(String s) {
    16 this.s = s;
    17 }
    18 public String toString() {
    19 return s;
    20 }
    21 }
frog:~/workspaces/test/jdbnontop $ /java/re/j2se/1.4.0/nightly/binaries/solsparc/latest/bin/javac -g T.java
frog:~/workspaces/test/jdbnontop $ /java/re/j2se/1.4.0/nightly/binaries/solsparc/latest/bin/jdb T
Initializing jdb ...
*** Reading commands from /home/gafter/workspaces/test/jdbnontop/.jdbrc
> stop at T;10
Usage: stop at <class>:<line_number> or
       stop in <class>.<method_name>[(argument_type,...)]
> stop at T:10
Deferring breakpoint T:10.
It will be set after the class is loaded.
> run
run T
>
VM Started: Set deferred breakpoint T:10
 
Breakpoint hit: "thread=main", T.h(), line=10 bci=0
10 System.out.println(s);
 
main[1] print this
 this = instance of T(id=281)
main[1] print (" " + this)
 (" " + this) = " instance of T(id=281)"
main[1]

###@###.### 2001-10-08