8.我们定义一个Account类来描述银行账户,银行账户有账户名、金额等属性
特征,同时有存款、取款等行为特征,下述代码适合描述的是哪项? A.class Accountf String name;//账户 String amount; //金额 Account (String name)( )
void deposit (double mount){ //存款 )
void withdraw (double mount){ //取款 } )
B.class Accountf String name;//账户
doujole amount; //金额 Account (double amount){ )
void deposit (double mount){ //存款 )
void withdraw (double mount){ //取款 ) )
C.class Accountf String name;//账户
double amount; //金额 Account (String name){ )
void deposit (double mount){//存款 )
void withdraw (double mount){ //取款 ) )
D.class Accountf String name;//账户 double amount;//金额 Account (String name){ ) void deposit(){//存款 )
void withdraw(){//取款 ) )
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9.现有:
1. class Banana2 f 2. static int X=2;
3.'public static void main (String [] args) { 4. int X=2;
5.Banana2 b=new Banana2(); 6. b.go(x); 7. }
8. static {x+=x; ) 9. void go (int x) { 10. ++x;
11. System. out.println (x); 12. } 13. } 结果为: A.7 B. 5 C. 3 D. 2
10.现有:
1. class TestFoo f 2. int x;
3. String y;
4.int getX() { return x; } 5.String getY() {return y; } 6. void setX (int x) { 7. int Z=7: 8. this.x=x; 9. } 10. }
可以添加多少个修饰符来封装此类? A.5 B. 4 C. 3 D. 2
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11.定义枚举如下:
public enum Direction{ EAST,SOUTH,WEST,NORTH )
F列正确使用该枚举类型的语句是哪项? A. Direction Direction=EAST;
B. Direction direction=Direction.WEST; C. int a- Direction.NORTH; n Direction direction=2;
12.定义类: package utils; public class Rep{
public static String twice (String s){return s+s ;) }
再定义另一个类Demo: l.//insert code here 2.public class Demo{
3. public static void main (String[] args){ 4.System. out .println( twice( \ 5. } 6.}
在第一行插入哪项代码,可以使程序正常编译和执行? A.import utils.*; B. import utils.Rep.*;
C. import static utils.Rep.twice; D. static import utils.Rep.twice;
13.现有:
public class TestDemo{ private int X-2; static int y=3;
public void method(){ final int i=100; int j =10; class Cinner {
public void mymethod(){ //Here } } } }
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在Here处可以访问的变量是哪些?(选三项) A.X B. y C. j D. i
14.现有如F包结构: com |一一X
| |一一Alpha.class | |
| |一一y
I |一一Beta.class |
|l-- Gamma.class 和类:
class Test { Alpha a; Beta b; Gamma c; }
哪三个必须加入到类Test中,以使其通过编译?(选三项) A. package y; B. package com; C. import com.x.y.*; D. import com.x.*;
15.现有2个文件: 1.package x; 2. public class X{
3.public static void doX() {System.out.print(\ 4. } 和:
1. class Find{
2.public static void main(String [] args) { 3. //insert code here 4. } 5. }
哪两行分别插入到类Find的第3行将编译并产生输出“doX”?(选两项)
A.doX();
B. X.doX(); C.x.X.doX();
D. x.X myX=new x.X();myX.doX();
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1D 2A 3C 4C 5A 6C 7 ACD 8C 9C 10 D 11 B 12 C 13 A B D 14 BCD 15 C D
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