Integer 的"=="不能随意使用

public class IntegerDemo {
	public static void main(String[] args) {
		Integer a=127;
		Integer b=127;
		System.out.println(a==b);//true
		Integer aa=128;
		Integer bb=128;
		System.out.println(aa==bb);//false
		Integer aaa=129;
		int bbb=129;
		System.out.println(aaa==bbb);//true
		Integer aaaa=130;
		Integer bbbb=130;
		System.out.println(aaaa==bbbb.intValue());//true
	}
}