public class Parent { int change() {…} } class Child extends Parent { } Which methods can be added into class Child?()
class Car implements Serializable { } class Ford extends Car { } 如果试图序列化一个Ford实例,结果为()
现自: class Car implements Serializable () class Ford extends Car {} 如果试图序列化一个Ford实例,结果为()
Given: class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and: ClassA p0 = new ClassA(); ClassB p1 = new ClassB(); ClassC p2 = new ClassC(); ClassA p3 = new ClassB(); ClassA p4 = new ClassC(); Which three are valid?()
class One { void foo() {} } class Two extends One { //insert method here } Which three methods, inserted individually at line 14, will correctly complete class Two?()
现有: class ClassA {} class ClassB extends ClassA {) class ClassC extends ClassA {) 以及: ClassA p0=new ClassA(); ClassB pl=new ClassB(); ClassC p2=new ClassC(); ClassA p3=new ClassB(); ClassA p4=new ClassC(); 下列哪些是正确的?()
class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()
class A { A() { } } class B extends A { } Which two statements are true?()
现有: interface I { void go(); } abstract class A implements I { } class C extends A { void go(){ } } 结果是什么?()
class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and: ClassA p0 = new ClassA(); ClassB p1 = new ClassB(); ClassC p2 = new ClassC(); ClassA p3 = new ClassB(); ClassA p4 = new ClassC(); Which three are valid?()
class A { protected int method1(int a, int b) { return 0; } } Which two are valid in a class that extends class A?()
检查下面的代码:class E1 extends Exception{ };class E2 extends E1{ }class SuperQuiz6_2 { }public class Quiz6_3 extends SuperQuiz6_2{public void f(Boolean flag) throws E1{//一一X一一}}下列的语句,哪—个可以放到--X--位置,而且保证编译成功。
给出下面代码: public class Parent{int change(){ }} class Child extends Parent{} 可加入类Child中的方法是( )。
以下代码运行结果是class Base {}class Sub extends Base {}class Sub2 extends Base {}class CEx{public static void main(String argv[]){Base b = new Base();Sub s = (Sub) b;}}
已知类的继承关系如下:class Employee;class Manager extends Employeer;class Director extends Employee;则以下语句能通过编译的有哪些?
检查下面的代码: class E1 extends Exception{ } class E2 extends E1 { } public class Quiz6_5{ public static void main(String[] args){ try{ throw new E1(); } // --X-- } } 下列语句,哪一个可以放到--X--位置,而且保证编译成功。
class A{}class B{}class C extends A B{}//同时继承了两个父类
看下列程序 package a; class Parent { private int i = 20; protected int j = 30; public int k = 40; int h = 50; } class Child extends Parent { } class GrandSon extends Child { void f() { } } 在子类GrandSon的方法f()中不可以操作的变量是
已知定义public class Employee public class Manager extends Employee public class Contr已知定义public class Employee public class Manager extends Employee public class Contractor extends Employee Employee e=new Employee()
阅读下列程序段,不合法的行是______。class Computer{}class Monitor extends Computer{}class Ha阅读下列程序段,不合法的行是______。 class Computer{} class Monitor extends Computer{} class HardDrive extends Computer { public void test()
请写出代码的运行结果。 class A{ int f(int x,int y){ return x+y; } } class B extends A{ int
以下程序的执行结果是()class Guy {public Guy(){System.out.print(“111,”);}}class Cowboy extends Guy {public Cowboy(){System.out.print(“222,”);}}class Wrangler extends Cowbo
16、下列()选项替换程序中的【代码】会导致编译错误。 abstract class AAA { abstract protected int getNumber(); } class BBB extends AAA { 【代码】 }
【多选题】(7-2)有如下代码,下面哪些说法是正确的?() class X { X() { } } class Y extends X { }