WTF, Java?

public class App {
	public static void main(String[] args) {
		
		Integer b = 400;
		Integer c = 400;
		System.out.println(b == c); // => false
		
		Integer b1 = 1;
		Integer c1 = 1;
		System.out.println(b1 == c1); // => true
		
		Integer b2 = new Integer(1);
		Integer c2 = new Integer(1);
		System.out.println(b2 == c2); // => false
		
	}
}