Chapter 4. Selected classes from the Java API and arrays

4.1. Welcome to the world of the String class

4.1.1. Creating String objects

4.1.2. The class String is immutable

4.1.3. Methods of the class String

4.1.4. String objects and operators

4.1.5. Determining equality of Strings

4.2. Mutable strings: StringBuilder

4.2.1. The StringBuilder class is mutable

4.2.2. Creating StringBuilder objects

4.2.3. Methods of class StringBuilder

4.2.4. A quick note on the class StringBuffer

4.3. Arrays

4.3.1. What is an array?

4.3.2. Array declaration

4.3.3. Array allocation

4.3.4. Array initialization

4.3.5. Combining array declaration, allocation, and initialization

4.3.6. Asymmetrical multidimensional arrays

4.3.7. Arrays of type interface, abstract class, and class Object

4.3.8. Members of an array

4.4. ArrayList

4.4.1. Creating an ArrayList

4.4.2. Adding elements to an ArrayList

4.4.3. Accessing elements of an ArrayList

4.4.4. Modifying the elements of an ArrayList

4.4.5. Deleting the elements of an ArrayList

4.4.6. Other methods of ArrayList

4.5. Comparing objects for equality

4.5.1. The method equals in the class java.lang.Object

4.5.2. Comparing objects of a user-defined class

4.5.3. Incorrect method signature of the equals method

4.5.4. Contract of the equals method

The hashCode() method

4.6. Working with calendar data

4.6.1. LocalDate

4.6.2. LocalTime

4.6.3. LocalDateTime

4.6.4. Period

4.6.5. DateTimeFormatter

4.7. Summary

4.8. Review notes

4.9. Sample exam questions

4.10. Answers to sample exam questions