题目内容

有类Person定义如下：public class Person {String name = "Peter";int age = 10 ;void sayHi() {System.out.println("Hi,I'm "+name+",I'm " +age+" years old.");}}以下操作的结果是：Person p = new Person();Person p1 = p;p1.name = "Alice";p1.age = 12;System.out.print(p.name+" "+p.age+" ");System.out.println(p1.name+" "+p1.age+" ");

A. null 0 Alice 12
B. Peter 10 Alice 12
C. Alice 12 Alice 12
D. Peter 10 Peter 10

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有类Person定义如下：public class Person {String name = "Peter";int age = 10 ;void sayHi() {System.out.println("Hi,I'm "+name+",I'm " +age+" years old.");}}以下操作的结果是：Person p = new Person();Person p1 = new Person();p1.name = "Alice";p1.age = 12;System.out.print(p.name+" "+p.age+" ");System.out.println(p1.name+" "+p1.age+" ");

A. null 0 Alice 12
B. Peter 10 Alice 12
C. Alice 12 Alice 12
D. Peter 10 Peter 10

有类Person定义如下：public class Person {String name;int age ;void show() {System.out.print (name+" " +age+" ");}}以下操作的结果是：Person p = new Person();p.show();p = new Person();p.name = "Alice";p.age = 12;p.show();

A. null 0 null 0
B. null 0 Alice 12
C. Alice 12 Alice 12
D. Alice 12 null 0

下列不属于面向对象程序设计的基本特征的是：

A. 抽象
B. 封装
C. 继承
D. 静态

类与对象的关系是

A. 类是对象的抽象
B. 对象是类的抽象
C. 对象是类的子类
D. 类是对象的具体实例