wat.java

public class Main {
        public static void main(String[] args) {
                Integer a = Integer.valueOf(1);
                Integer b = Integer.valueOf(1);
                System.out.println("a == b -> " + (a == b));
                Integer c = Integer.valueOf(1234);
                Integer d = Integer.valueOf(1234);
                System.out.println("c == d -> " + (c == d));
        }
}

~:$ javac Main.java
~:$ java Main
a == b -> true
c == d -> false