有如下类的定义，创建Employee对象错误的是（） public class Employee{ private int age; private String name; public Employee(int age){ this.age = age; } public Employee(String name){ this.name = name; } public Employee(int age,String name){ this(age); this.name = name; } }
A: Employee emp = new Employee(10);
B: Employee emp = new Employee("Tom");
C: Employee emp = new Employee();
D: Employee emp = new Employee(10,"Tom");
A: Employee emp = new Employee(10);
B: Employee emp = new Employee("Tom");
C: Employee emp = new Employee();
D: Employee emp = new Employee(10,"Tom");
举一反三
- 有如下类的定义，创建Employee对象正确的是（） public class Employee{ private int age; private String name; public void Employee(){ } public Employee(int age){ this.age = age; } public Employee(String name){ this.name = name; } } A: Employee e = new Employee( ) B: Employee e = new Employee(10); C: Employee e = new Employee(tom); D: Employee e = new Employee(10,"tom");
- 关于Employee类的对象说法错误的是（） public class Employee{ private int age; private String name; public Employee(){ } public Employee(int age,String name){ this.age = age; this.name = name; } } public class TestEmployee{ public static void main(String[] args){ Employee e1 = new Employee(); Employee e2 = new Employee(10,"tom"); Employee e3 = e2; Employee e4 = new Employee(10,"tom"); } } A: e1对象的name和age属性的值是默认值null和0 B: e2和e3指向相同的内存空间，即指向同一个对象 C: e3和e4对象的age属性值都是10，name属性值都是"tom"，所以是同一个对象 D: 表达式e2==e3的值为true，e3==e4的值为false
- 下面哪个程序变量age的定义是正确的（） A: public class Employee{ public void show(){ System.out.println(age); } public int age; } B: public class Employee{ public void show(){ System.out.println(age); int age = 20; } } C: public class Employee{ public void show(){ System.out.println(age); } }
- 有如下定义 struct Employee { char name[12]; int age; char sex; } emp[10],*p=std; 以下语句错误的是________。 答
- 如果要插入一条员工数据，则下列选项正确的是（） A: INSERT INTO Employee(Name,Gender,Age,Rank) values('张朝阳'，'男'，48，'201') B: INSERT INTO Employee(Name,Gender,Age,Rank) values(“张朝阳”，”男”，48，”201”) C: INSERT INTO Employee(Name,Gender,Age) values(‘张朝阳'，'男'，48，'201') D: INSERT INTO Employee(Name,Gender,Age,Rank) value(‘张朝阳'，'男'，48，'201')