201 Sun SATC Java程序员(全真卷01).doc

全真题01
1:单选(1分) JVM在执行一个Java类时,大致采用以下过程?
A 装载类-〉校验类-〉执行类中的代码 B 校验类-〉装载类-〉执行类中的代码
C 装载类-〉执行类中的代码-〉校验类 D 执行类中的代码-〉装载类-〉校验类
2:单选(1分)
public class Parent{
public void change(int x){}
}
public class Child extends Parent{
//覆盖父类change方法
}
下列哪个声明是正确的覆盖了父类的change方法?
A protected void change(int x){} B public void change(int x, int y){}
C public void change(String s){} D public void change(int x){}
3: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{
private String department;
public Manager(String name,String department){
= department;
super(name);
(getName());
}
}
执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?
A smith B null C SALES D 编译错误
4:单选(1分)
public class Pet{
private String name;
public Pet(){
(1);
}
public Pet(String name){
(2);
}
}
public class Dog extends Pet{
public Dog(){
(4);
}
public Dog(String name){
super(name);
(3);
}
}
执行new Dog(“棕熊”);后程序输出是哪项?
A 33 B 13 C 23 D 123
5:单选(1分) ()输出对象引用的时候得到有意义的信息,我们应该覆盖Object中的哪个方法?
A equals B hashCode C toString D notify
6:单选(1分)
public class Pet{
private String name;
public Pet(String name){
= name;
}
public void speak(){
(name);
}
}
public class Dog extends Pet{
public Dog(String name){
super(name);
}
public void speak(){
();
(“ Dog ”);
}
}
执行代码
Pet pet = new Dog(“京巴”);
();
后输出的内容是哪项?
A 京巴 B 京巴 Dog C null D Dog京巴
7:单选(1分)
public class Pet{
public void speak(){
(“ Pet ”);
}
}
public class Cat extends Pet{
public void speak(){
(“ Cat ”);
}
}
public class Dog extends Pet{
public void speak(){
(“ Dog ”);
}
}
执行代码
Pet[] p = {new Cat(),new Dog(),new Pet()};
for(int i=0;