1.4 Exercises

1. True/False: All variables, parameters, and methods must have a declared type in Java, and the type can never change.

2. Suppose we have a function smaller(a, b) that takes in two int arguments a and b and returns the smaller of the two. What would the expression String x = smaller(10, 20) + 3; output?

3. Choose all statements that are true in Java:

   • All code must be part of a class.

   • The end and beginning of code segments are delimited using curly brackets {}.

   • All statements in Java end with a semi-colon ;.

   • Any code we want to run must be inside of a function public static void main(String[] args).

Solutions

1. True. See "Static Typing" for more information.

2. This line of code would cause a compilation error because the declared type String is incompatible with the type returned by smaller and adding 3, which would be an int.

3. All the following statements are true.