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现有: 
cl的答案

现有: 
class Tree { 
private static String tree = "tree "; 
String getTree ()  {  return tree;  }      
} 
class Elm extends Tree { 
private static String tree = "elm "; 
public static void main (String  []  args)  {      
new Elm() .go (new Tree())  ;     
}
} 
void go (Tree t)  { 
String  s =  t.getTree () +Elm.tree  +  tree  +   (new  Elm() .getTree ()) ;     
System.out.println (s) ;}    
结果为:() 
               

单选题
2022-11-04 14:54
A、 elm elm elm elm
B、 tree elm elm elm
C、 tree elm elm tree
D、 tree elm tree elm
查看答案

正确答案
C

试题解析

感兴趣题目

在J2EE中,有如下代码在Servlet1.Java中   
Import javax.servlet.*;   
Import javax.servlet.http.*   
Import java.io.IOException;    
Import java.io.PrintWriter;   
Public class Servlet1 extends HttpServlet{ 
Public void init () throw ServletException {}  
Public void service(HttpServletRequest request, 
HttpServletResponce response) throws ServletException,IOException{ 
PrintWriter out=response.getWriter();  
Out.println(“hello!”); } } 
假如编译Servlet要具备的环境都已经建立好。现在用完全正确的命令编译该文件,对于以下成熟正确的是()  

Which statements concerning the relationships between the following classes are true?()  
class Foo {  int num;  
Baz comp = new Baz();  
}  
class Bar {  boolean flag;  
}  
class Baz extends Foo {  
Bar thing = new Bar();  
double limit;  
}  

现有: 
interface Data {public void load();} 
abstract class Info {public abstract void load();}     
下列类定义中正确使用Data和Info的是哪项?() 

int [] my_Array;   
my_Array = new int[5]; 
for(int count = 0; count <= 5; count++) 
System.out.println(my_Array[count]); 
以上Java代码运行的结果是()。 

在Java语言中,如果你有下面的类定义: 
Abstract class Shape{ Abstract void draw(); } 
class Square extendeds Shape{}
如果你试图编译上面的代码会发生()。 

在Java语言中,如果你有下面的类定义:  
abstract class Shape { 
abstract void draw();    }   
Class Square extends Shape {} 
如果你试图编译上面的代码会发生()。 

路由器的部分配置如下: 
Class-map match-any GOLD 
match ip precedence ef 
class-map match-any SILVER 
Match ip dscp af31 
Policy-map Branch 
Class GOLD 
Priority percent 20 
Class SILVER 
bandwidth percent 15 
random-detect dscp-based 
interface Serial0/1 
description PPP link to BRANCH bandwidth 1536 
ip address 10.200.40.1 255.255.255.252 
encapsulation ppp 
路由器配置VOICE数据流到优先级队列中,但发现并没有起到作用,可能什么原因?()

class java { 
public static void main(String [] java) {  
for (int Java = 1; Java 〈 java.length; Java++)  
System.out.print("java ");  
}  
}  
和命令行: 
java java java java java  
结果为:()  

现有: 
class Tree { 
private static String tree = "tree "; 
String getTree ()  {  return tree;  }      
} 
class Elm extends Tree { 
private static String tree = "elm "; 
public static void main (String  []  args)  {      
new Elm() .go (new Tree())  ;     
}
} 
void go (Tree t)  { 
String  s =  t.getTree () +Elm.tree  +  tree  +   (new  Elm() .getTree ()) ;     
System.out.println (s) ;}    
结果为:() 
               

import java.io.*; 
public class Forest implements Serializable { 
private Tree tree = new Tree(); 
public static void main(String [] args) { 
Forest f= new Forest(); 
try { 
FileOutputStream fs = new FileOutputStream(”Forest.ser”); 
ObjectOutputStream os = new ObjectOutputStream(fs); 
os.writeObject(f); os.close(); 
} catch (Exception ex) { ex.printStackTrace(); } 
} 
} 
class Tree { } 
What is the result?() 

public class TestOne { 
public static void main (String[] args) throws Exception { 
Thread.sleep(3000); 
System.out.println(”sleep”); 
} 
} 
What is the result?() 

public class A extends Thread { 
A() { 
setDaemon(true); 
} 
public void run() { 
(new B()).start(); 
try { 
Thread.sleep(60000); 
} catch (InterruptedException x) {} 
System.out.println(“A done”); 
} 
class B extends Thread { 
public void run() { 
try { 
Thread.sleep(60000); 
} catch (InterruptedException x) {} 
System.out.println(“B done”); 
} 
} 
public static void main(String[] args) { 
(new A()).start(); 
} 
}  
What is the result?()  

相关题目

给出下列java源代码: 
//Point x 
Public class Interesting{} 
在源代码//point x处添加()能符合java语法 

阅读以下代码: 
public class Test{ 
public static void main(){ 
System.out.println(“x=”+x);   } } 
请问,代码运行的结果是?() 

public class Car { 
private int wheelCount; 
private String vin; 
public Car(String vin) { 
this.vin = vin; 
this.wheelCount = 4; 
} 
public String drive() { 
return “zoom-zoom”; 
} 
public String getInfo() { 
return “VIN: “+ vin + “wheels: “+ wheelCount; 
} 
} 
And: 
public class MeGo extends Car { 
public MeGo(String vin) { 
this.wheelCount = 3; 
} 
} 
What two must the programmer do to correct the compilation errors?()

1. class Pizza { 
2. java.util.ArrayList toppings; 
3. public final void addTopping(String topping) { 
4. toppings.add(topping);
5. } 
6. } 
7. public class PepperoniPizza extends Pizza { 
8. public void addTopping(String topping) { 
9. System.out.println(”Cannot add Toppings”); 
10. } 
11. public static void main(String[] args) { 
12. Pizza pizza = new PepperoniPizza(); 
13. pizza.addTopping(”Mushrooms”); 
14. } 
15. } 
What is the result?() 

分析下列Java代码:  
class A { 
public static void main(String[] args)    {  
method();   }     
static void method()    {     try    { 
System.out.println("Hello");    System.exit(0);    }   
finally   { 
System.out.println("good-bye");  }   }    } 
编译运行后,输出结果是()。  
  

Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given: 
import java.io.*; 
class Food {Food() { System.out.print(”1”); } } 
class Fruit extends Food implements Serializable { 
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public class Banana2 extends Fruit { int size = 42; 
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What is the result?() 

在Java语言中,小明在他的包mypackage中定义了类My_Class, 在mypackage的子包mysubpackage中也有个类My_Class。小明用 import mypackage.*;引入包, 执行其中的语句: My_Class NewClass = new My_Class();时,将发生()。 

import java.util.*; 
public class PQ { 
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pq.add(”carrot”);
pq.add(”apple”); 
pq.add(”banana”); 
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What is the result?() 

现有:  
public interface A {}  
以下哪项声明是合法的?() 

现有: 
public interface A {}  
以下哪项声明是合法的?() 

What is wrong with the following code?()  
class MyException extends Exception {}  
public class Qb4ab {  
public void foo() {  try {  bar();  } finally {  baz();  
} catch (MyException e) {} 
}  
public void bar() throws MyException {  
throw new MyException(); 
}  
public void baz() throws RuntimeException {  
throw new RuntimeException(); 
 }  
}  

现有: 
class Birds { 
public static void main (String  []  args)  {  
try { 
throw new Exception () ;   
} catch (Exception e) {  
try { 
 throw new Exception () ; 
}  catch  (Exception e2)  {  System.out.print ("inner           "); } 
 System. out.print ( "middle" ) ;   
} 
System.out.print ("outer") ;   
}   
} 
结果是()

Given:  
11. static class A {  
12. void process() throws Exception { throw new Exception(); }  
13. }  
14. static class B extends A {  
15. void process() { System.out.println("B "); }  
16. }  
17. public static void main(String[] args) {  
18. A a = new B();  
19. a.process();  
20. }  
What is the result? ()

现有: 
void topGo()  {     
try  { 
middleGo(); 
}  catch  (Exception e)  {     
System.out.print("catch");     
}     
} 
void middleGo()  throws Exception  {    
go(); 
system.out.print("late middle");    
} 
void go()  throws ExceptiOn  {    
throw new Exception();    
}
如果调用 topGo () ,则结果为:() 

11. static class A { 
12. void process() throws Exception { throw new Exception(); } 
13. } 
14. static class B extends A { 
15. void process() { System.out.println(”B”); } 
16. } 
17. public static void main(String[] args) { 
18. new B().process(); 
19. } 
What is the result?() 

import java.io.IOException;  
public class ExceptionTest(  
public static void main (Stringargs) 
try (  
methodA();  
) catch (IOException e) (  
system.out.printIn(“Caught IOException”); 
) catch (Exception e) (  
system.out.printIn(“Caught Exception”);  
)  
)  
public void methodA () {  
throw new IOException (); 
}    
What is the result?()  

1. class Exc0 extends Exception { } 
2. class Exc1 extends Exc0 { } 
3. public class Test { 
4. public static void main(String args[]) { 
5. try { 
6. throw new Exc1(); 
7. } catch (Exc0 e0) { 
8. System.out.println(“Ex0 caught”); 
9. } catch (Exception e) { 
10. System.out.println(“exception caught”); 
11. } 
12. } 
13. } 
What is the result?()  

现有:  
class ThreadExcept implements Runnable {  
public void run() { throw new RuntimeException("exception "); } 
public static void main(String [] args) {  
new Thread(new ThreadExcept()).start();  
try {  
int x = Integer.parseInt(args[0]);  
Thread.sleep(x);  
System.out.print("main ");   
} catch (Exception e) { }     
}  
}  
和命令行: 
java ThreadExcept 1000   
哪一个是结果?() 

现有: 
class ThreadExcept implements Runnable  { 
public void run()  {  throw new RuntimeException("exception ");  } 
public static void main(Stri_ng  []  args)  { 
new  Thread (new  ThreadExcept()).start(); 
try  { 
int x=Integer.parselnt (args [0]); 
Thread. sleep (x); 
System.out.print("main"); 
} catch (Exception e)  {  } 
} 
} 
和命令行:  java ThreadExcept l000    
哪一个是结果?()    

Class TestException 
1. public class TestException extends Exception { 
2. } Class a: 
1. public class a { 
2. 
3. public String sayHello(String name) throws TestException { 
4. 
5. if(name == null) { 
6. throw new TestException(); 
7. } 
8. 
9. return “Hello “+ name; 
10. } 
11. 
12. } 
A programmer wants to use this code in an application:
45. A a=new A(); 
46. System.out.println(a.sayHello(”John”)); 
Which two are true?()

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