Hello World

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello, Java!");
  }
}

Types

• Primitives: int, long, double, float, boolean, char, byte, short.
• Reference types: String, arrays, classes, interfaces, enums, records.

Control Flow

int n = 5;
if (n > 3) System.out.println("big");
else System.out.println("small");

for (int i = 0; i < 3; i++) System.out.println(i);

switch (n) {
  case 1 -> System.out.println("one");
  case 2 -> System.out.println("two");
  default -> System.out.println("other");
}