Unicharm Interview Questions and Answers

ArrayList is a dynamic array in Java that automatically increases its capacity when elements are added.

• ArrayList is a resizable array implementation in Java.

• When elements are added to an ArrayList, if the current capacity is not enough, a new array with increased capacity is created and elements are copied over.

• Example: ArrayList list = new ArrayList(); list.add("apple");

Use JavaScript methods to extract desired output from a complex object

• Use Object.keys() to get an array of keys in the object

• Use Object.values() to get an array of values in the object

• Use Object.entries() to get an array of key-value pairs in the object

Resolve a list of promises to get the output

• Use Promise.all() method to wait for all promises to resolve

• The output will be an array of resolved values in the same order as the input promises

• Handle any errors that may occur during promise resolution

Design a wallet service similar to PayPal for online transactions.

• Implement secure user authentication and authorization

• Allow users to link bank accounts and credit/debit cards

• Provide a user-friendly interface for sending and receiving money

• Include features like transaction history, balance tracking, and notifications

• Ensure compliance with financial regulations and security standards

Event lifecycle refers to the stages an event goes through from creation to completion.

• Creation of event

• Propagation of event

• Handling of event

• Completion of event