[Java] Integer wrapper class reference

		Integer a = new Integer(1);
		Integer b = new Integer(1);
		System.out.println(a == b); // #=> false

		Integer c = 127;
		Integer d = 127;
		System.out.println(c == d); // #=> true
		
		c = 128;
		d = 128;
		System.out.println(c == d); // #=> false

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