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This guide outlines the steps for testing applications Class A and B. Start by executing Class A and then switch to Java. Modify the `startApp` function from "ClassicsJavaA" to "ClassicsJavaB". After making the changes, proceed to test the functionality without saving. When prompted for confirmation, select "Yes" to apply the rewrite. Be aware that after being rewritten, the card number and expiration date in Class B may become invalid, leading to an "Invalid Expiration Date" error. If anomalies occur, stop execution and confirm.
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