Understand what the Java Development Kit (JDK) is.

Know that the JDK includes many pre-built classes for use in Java programs

Use classes defined by java in the java.lang package such as java.lang.String and java.lang.Math.

Write code that imports and uses classes from packages other than java.lang.

Use Javadocs to find information about JDK classes.

Create String values using string literals.

Use the String methods: length(), substring(), indexOf(), toUpperCase(), and toLowerCase() along with the + operator to take apart and put back together Strings in various ways. (E.g. capitalize a string.)

Write code that uses equals() and compareTo() to compare strings.

Understand String immutability and its implications

Use more advanced String methods: equals(), compareTo(), trim()

Work with escape sequences in Strings

Write String literals containing Unicode characters.

Explore other methods defined in the String class that are documented in the Javadocs.

Learn about regular expressions.

Use the StringBuilder class to create strings rather than repeated uses of the + operator.

Explain when the toString() method is called automatically.

Override toString() in your own classes to provide meaningful String representations.

Explain the difference and relationship between the toString() method and String.valueOf.

Construct empty ArrayLists.

Add and remove elements to and from an ArrayList.

Access elements in an ArrayList using get() and set().

Correctly declare ArrayLists with a type parameter, e.g. ArrayList<String>.

Correctly initialize ArrayLists declared with a type parameter.

Iterate over ArrayLists using regular and enhanced for loops.

Explain what causes an IndexOutOfBoundsException when using an ArrayList.

Write code that removes elements meeting some criteria from an ArrayList.

Explain when you will get a ConcurrentModificationException

Describe the one situation when you must explicitly refer to wrapper classes.

Explain the relationship between wrapper classes and ArrayLists.

Use the static methods defined in wrapper classes Integer.parseInt(), Double.parseDouble(), and Boolean.parseBoolean() to convert Strings to int, double, and boolean values.

Explain the circumstances when a primitive type will be autoboxed.

Explain the circumstances when an instance of a wrapper class will be automatically unboxed.

Draw a memory diagram of the difference between an int variable and its value and an Integer variable and its value.

Use static methods from Math class abs(), pow(), sqrt() in mathematical computations, e.g. to write expressions that compute the distance between two points or the length of a hypotenuse of a triangle with given sides.

Use Math.PI in calculations that require the mathematical value π. Or if you’re really cool use Math.TAU

Use Math.random() along with casting and other arithmetic operators to produce int or double values in a given range, e.g. an int in the range 1-100, inclusive.

Use additional Math methods: min(), max()

Find and use more specialized Math methods for more complex calculations.