202 Sun SATC Java程序员(全真卷02).doc

全真题02
1:单选(1分)在子类中调用父类中被覆盖的方法时需要使用哪项关键字?
A this B super C new D 以上都不是
2:单选(1分)
public class Employee{
private String name;
public Employee(String name){
= name;
}
public String getName(){
return name;
}
}
public class Manager extends Employee{
public Manager(String name){
(getName());
}
}
执行语句new Manager(“smith”)后程序的输出是哪项?
A smith B null C 编译错误 D name
3:单选(1分)
public class Employee{
private String name;
public Employee(String name){
= name;
}
public void display(){
(name);
}
}
public class Manager extends Employee{
private String department;
public Manager(String name,String department){
super(name);
= department;
}
public void display(){
(()+”,”+department);
}
}
执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?
A smith,SALES B null,SALES C smith,null D null,null
4:单选(1分)用于编译Java源文件的JDK工具是?
A javac B jdb C java D junit
5:单选(1分)现有:
1. class Beverage {
2. Beverage() { ("beverage "); }
3. }
4. class Beer extends Beverage {
5. public static void main(String [] args) {
6. Beer b = new Beer(14);
7. }
8. public int Beer(int x) {
9. this();
10. ("beer1 ");
11. }
12. public Beer() { ("beer2 "); }
13. }
结果是什么?
A beer1 beverage B beer2 beverage C beverage beer1 D 编译失败
6:单选(1分)Java程序的跨平台特征是由以下哪项技术实现的?
A 系统硬件 B JVM C Java编译器 D 操作系统
7:单选(1分)现有:
1. class Over {
2. int doIt(long x) { return 3; }
3. }
4.
5. class Under extends Over {
6. // insert code here
7. }
和四个方法:
short doIt(int y) { return 4; }
int doIt(long x, long y) { return 4; }
private int doIt(short y) { return 4; }
protected int doIt(long x) { return 4; }
分别插入到第6行,有几个可以通过编译?
A 0 B 1 C 3 D 4
8:单选(1分)现有:
5. class BitStuff {
6. BitStuff go() { ("bits "); return this; }
7.}
8. class MoreBits extends BitStuff {
9. MoreBits go() { ("more