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CS61B

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.