1.7 包装类

public static void main(String[] args) {
        int n1 = 100;
        Integer integer = new Integer(n1);//手动装箱
        Integer integer1 = Integer.valueOf(n1);//手动装箱
        int i = integer.intValue();//手动拆箱
  
        int n2 = 10;
        Integer integer2 = n2;//自动装箱
  			int n3 = integer2;//自动拆箱
    }