package integer;

public class baozhuang {

	public static void main(String[] args) {

		System.out.println(Integer.MAX_VALUE);

		System.out.println(Integer.MIN_VALUE);

		System.out.println(Integer.TYPE);

		System.out.println(Integer.SIZE);

		System.out.println(Double.SIZE);

		System.out.println(Float.SIZE);

		Integer n1=15;

		double n2=n1.doubleValue();

		System.out.println(n2);

		Integer n=new Integer(15);//装箱

		Integer n3=Integer.valueOf(45); //装箱,推荐，带有缓存,最好使用第二种

	}

}