Integer(自动拆箱装箱)

public class AutoInteger {
	public static void main(String[] args) {
		Integer i = new Integer(1);
		Integer j = new Integer(1);
		System.out.println(i == j);// false 对象地址
		System.out.println(i.equals(j));// true 继承Object重写equals,比较的对象数据

		System.out.println("===================");

		Integer a = 500;
		Integer b = 500;
		System.out.println(a == b);// false
		System.out.println(a.equals(b));// true

		System.out.println("===================");

		// 数据在byte(-128~127)范围内,JVM不会从新new对象
		Integer aa = 127; // Integer aa = new Integer(127)
		Integer bb = 127; // Integer bb = aa;
		System.out.println(aa == bb); // true
		System.out.println(aa.equals(bb));// true
	}
}