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abstract class 和interface有什么区别？含

abstract class 和interface有什么区别？

含

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更多“abstract class 和interface有什么区别…”相关的问题

第1题

下面程序定义了一个类，关于该类说法正确的是（)。abstract class abstract Class{}A．该类能调用new

下面程序定义了一个类，关于该类说法正确的是()。abstract class abstract Class{}

A．该类能调用newabstractClass()；方法实例化为一个对象

B．该类不能被继承

C．该类的方法不能被重载

D．以上说法都不对

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第2题

运行下列程序的结果是（)abstract class MineBase { abstract void amethod（)； static int i； }pu

运行下列程序的结果是 () abstract class MineBase { abstract void amethod()； static int i； } public class Mine extends MineBase { public static void main(String argv[]){ int[]ar=new int[5]； for(i=0;i＜ar.length；i++) System.out.println(ar[i])；

A．打印5个0

B．编译出错，数组ar[]必须初始化

C．编译出错，Mine应声明为abstract

D．出现IndexOutOfBoundes的例外

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第3题

下列类声明正确是的（)。A．abstract final class HI{ ... }B．abstract private move（) { ... }C．

下列类声明正确是的()。

A．abstract final class HI{ ... }

B．abstract private move() { ... }

C．protected private number;

D．public abstract class Car{ ... }

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第4题

下列哪个类声明是正确的？A．abstract class G2 extends superClassl,superClass2{……}B．abstract p

下列哪个类声明是正确的？

A．abstract class G2 extends superClassl,superClass2{……}

B．abstract public class classmates{……}

C．public final class NewClass extends superClass implements Interfacel{……}

D．public abstract class String{……}

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第5题

Java代码查错 1. abstract class Name { private String name; public abstract boolean

Java代码查错

abstract class Name {

private String name;

public abstract boolean isStupidName(String name) {}

}

大侠们，这有何错误？

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第6题

People appear to be born to compute. The numerical skills of children develop so early and

so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth. Not long after learning to walk and talk, they can set the table with impressive accuracy--one plate, one knife, one spoon, one fork, for each of the five chairs. Soon they are capable of noting that they have placed five knives, spoons, and forks on the table and, a bit later, that this amounts to fifteen pieces of silverware. Having thus mastered addition, they move on to subtraction. It seems almost reasonable to expect that if a child were secluded on a desert island at birth and retrieved seven years later, he or she could enter a second-grade mathematics class without any serius problems of intellectual adjustment.

Of course, the truth is not so simple. This century, the work of cognitive psychologists has illuminated the subtle forms of daily learning on which intellectual progress depends. Children were observed as they slowly grasped--or, as the case might be bumped into- concepts that adults take for granted, as they refused, for instance, to concede that quantity is unchanged as water pours from short stout glass into a tall thin one. Psychologists have since demonstrated that young children, asked to count the pencils in a pile, readily report the number of blue or red pencils, but must be coaxed into finding the total. Such studies have suggested that the rudiments of mathematics are mastered gradually, and with effort. They have also suggested that the very concept of abstract numbers--the idea of a oneness, a twoness, a threenes that applies to any class of objects and is a prerequisite for doing anything more mathematically demanding than setting a table--is itself far from innate.

What does the passage mainly discuss？

A．Trends in teaching mathematics to children.

B．The use of mathematics in child psychology.

C．The development of mathematical ability in children.

D．The fundamental concepts of mathematics that children must learn.

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第7题

下列程序用来计算1+2+…n,当和大于100时停止计算,请填空。 Private Sub Form_Click（)Dim n as inte

下列程序用来计算1+2+…n,当和大于100时停止计算,请填空。

Private Sub Form_Click()

Dim n as integer,s as integer,I as integer,k as integer

s=0