If this is the input kk.java:

public class test {
    public static final test alpha = new test("foo", "bar");
    public static final test beta = new test("baz", "boo");
}

public class test2 {
    public static final test2 alpha2 = new test2("foo", "bar");
    public static final test2 beta2 = new test2("baz", "boo");
    public static final test alpha = new test("foo", "bar");
    public static final test beta = new test("baz", "boo");
}
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And this the code one line:

perl -MData::Dumper -le 'undef $/;$javafile = <>; while ( $javafile =~
+ / class (\w+) (.*?)^\}/smg ) { ($class,$body) = ($1,$2); while ( $bo
+dy =~ /(\w+)\s*=\s*new\s+$class\s*\((.*)\)/g) { ($variable,$parameter
+s)=($1,$2); foreach $v (split",",$parameters){ $v =~ s/[ "]//g; push 
+@{$var{$class}{$variable}},$v   } } }; print Dumper %var  ' kk.java
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this is the result:

$VAR1 = 'test';
$VAR2 = {
          'alpha' => [
                       'foo',
                       'bar'
                     ],
          'beta' => [
                      'baz',
                      'boo'
                    ]
        };
$VAR3 = 'test2';
$VAR4 = {
          'alpha2' => [
                        'foo',
                        'bar'
                      ],
          'beta2' => [
                       'baz',
                       'boo'
                     ]
        };
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Updated: Not oneline version:

#!/usr/bin/perl

use Data::Dumper;
use diagnostics;
use warnings;
use strict;

undef $/;
my %vars;                     # My vars space
my $javafile = <>;            # Read the java src

# Read all class' bodies
while ( $javafile =~ / class (\w+) (.*?)^\}/smg ) {
    my ($class,$body) = ($1,$2);

    # Read all vars' declarations
    while ( $body =~ /(\w+)\s*=\s*new\s+$class\s*\((.*)\)/g) {
        my ($variable,$parameters)=($1,$2);

        # Split parameters
        foreach my $v ( split ",",$parameters ) {

            # Filter bad characters
            $v =~ s/[ \"]//g;

            # Parameters falling into the black hole
            push @{ $vars{$class}{$variable} }, $v;
        }
    }
}

# Out of the space
print Dumper %vars;
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Updated. Edited for last test.