Basic Lines of Code in Java

• Types
  • int, long, double
• Variables
  • int n = 42;
  • var n = 42;
  • final var n = 42;
  • var words = new ArrayList<String>();
  • var mat = new Matrix<double>();
  • var contactInfoForID = new HashMap<String, ContactInfo>();
• Functions
  • static int multiply(int a, int b) { return a * b; }
  • static void print(ContactInfo a) { ... }
  • static String concat(String a, String b) { return ...; }
• Loops
  • for (int i = 1; i <= 10; ++i) { ... }
  • for (int i = 0; i < words.size(); ++i) { ... }
  • for (int i : List.of(5, 7, 11, 13)) { ... }
  • for (var word : words) { ... }

Note
In Java int and 42 are 32 bits wide, not 64 bits.