1. More than just a song and dance.

2. They are objects that store primitive variable values: Integer – stores an int Double – stores a double Character – stores a char Boolean – stores a boolean

3. Sometimes you want a primitive value stored as an object. This allows you to: Store primitives in complex data structures such as ArrayLists They are pass by reference instead of pass by copy They provide some additional helper methods

4. parseInt(String s) – takes in a String and converts it into the corresponding Integer toHexString(int i) – converts an integer to a hexadecimal String toBinaryString(int i) – converts an integer to a binary String

5. //Declaring variables Integer x = 5; Double y = 6.7; Character z = 'z'; Boolean flag = false; //Using parseInt String numInText = "29274"; Integer a = Integer.parseInt(numInText); //Performing operation Integer b = x + a; System.out.println(b);

6. ArrayList numbers = new ArrayList (); numbers.add(3); numbers.add(5); numbers.add(7); System.out.println(numbers);