白动装箱丶拆箱 Integer datal =10; Integer data2 =20; //转为 double值再除以3 System. out. println(datal. doublevalue()/ 3) //进行两个值的比较 System. out. println (datal. compare To (data2 odech04AutoBoxDemo iava自动装箱、拆箱 Integer data1 = 10; Integer data2 = 20; //转为double值再除以3 System.out.println(data1.doubleValue() / 3); //进行两个值的比较 System.out.println(data1.compareTo(data2)); code\ch04\AutoBoxDemo.java