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via Coderanch by James Brooks, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at project4.Shop.toString(Shop.java:51)	at java.lang.String.valueOf(String.java:2827)	at java.lang.StringBuilder.append(StringBuilder.java:115)	at project4.Tester.main(Tester.java:17)