• 2021-04-14
    class Person{}
    class Student extends Person{
    public int id;
    public int score;
    public String name;
    public int getScore()

    {
    return score;

    }


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    • 0

      (6-2)定义如下Person类,(1)处合理的代码是。 class Person { String name, department; int age; public Person(String n) { name = n; } public Person(String n, int a) { name = n; age = a; } public Person(String n, int a, String d) { ① department = d; } }

    • 1

      4.6 若有以下程序代码: class Person{ String name,department; int age; public Person(String n){name=n;} public Person(String n, int a){name=n; age=a;} public Person(String n, String d, int a ){ //执行此代码 } 下面那个选项可以添加到“//执行此代码”前面( )

    • 2

      在下列程序的划线处应填入的语句是class Person { private int a;}public class Man extends Person{ public int b; public static void main (String arg []){ Person p=new Person(); Man t=new Man(); int i: }} A.i=w; B.i=b C.i=p.a; D.i=t.b;

    • 3

      已有如下程序: class Person{ private int a; public void change(int m){a=m;} } public class Teacher extends Person { public int b; public static void main(String args[]){ Person p=new Person(); Teacher t=new Teacher(); int i; _____________________ } } 下面划线处填写的语句那些是非法的操作 提示:考查内容包括静态成员,私有成员,继承等知识点

    • 4

      请写出下列程序的输出结果。class A{public int f(int x) {return x+1;}}class B extends A{public int f(int x){return x*x;}}public class E{public static void main(String args[]){A a=new B();int m=a.f(10);System. out. println(m) ;}}