1. import java.util.*;  2.  3. Class FindStuff {  4. public static void  main(String [] args) {  5. // insert code here  6. c.put("x", 123);  7. }  8. } 分别插入到第5行,哪三行允许代码编译?() A、Map c = new SortedMap();B、HashMap c = new HashMap();C、HashMap c = new Hashtable();D、SortedMap c = new TreeMap();

1. import java.util.*;  2.  3. Class FindStuff {  4. public static void  main(String [] args) {  5. // insert code here  6. c.put("x", 123);  7. }  8. } 分别插入到第5行,哪三行允许代码编译?() 

  • A、Map c = new SortedMap();
  • B、HashMap c = new HashMap();
  • C、HashMap c = new Hashtable();
  • D、SortedMap c = new TreeMap();

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1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()  A、 Class AB、 Compilation fails.C、 An exception is thrown at line 2.D、 An exception is thrown at line 6.E、 The code executes with no output.

现有:   1.  class HorseRadish {   2.    // insert code here   3.    protected HorseRadish(int x) {    4.      System.out.println("bok choy");  5.    }  6.  }   7.  class Wasabi extends HorseRadish {   8.    public static void main(String [] args) {   9.      Wasabi w = new Wasabi();  10.   }    11. }   分别插入到第 2 行,哪两项允许代码编译并产生"bok choy" 输出结果?() A、 // just a commentB、 protected HorseRadish() { }C、 protected HorseRadish() { this(42);}D、 protected  HorseRadish() { new HorseRadish (42);}

现有2 个文件:  1. package x;  2. public class X {  3. public static void doX() { System.out.print("doX "); }  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”? ()A、doX();B、X.doX();C、x.X.doX();D、x.X myX = new x.X(); myX.doX();

1. import java.util.*;  2. class ForInTest {  3. static List list = new ArrayList();  4.  5. static List getList() { return list; }  6.  7. public static void main(String [] args) {  8. list.add("a"); list.add("b"); list.add("c");  9. // insert code here  10. System.out.print(o);  11. }  12. } 第 9 行插入哪一项将输出 abc?() A、for(char o: list)B、for(Object o: getList())C、for(Object o: getList();)D、for(Object o: o.getList())

现有:   1. class Book {   2. private final void read() { System.out.print("book "); }   3. }   4. class Page extends Book {   5. public static void main(String [] args) {   6. // insert code here   7. }   8. private final void read() { System.out.print("page "); }   9. }   和如下三个代码片段( x, y, z ):   x. // just a comment   y. new Page().read();  z. new Book().read();   分别插入到第6行,有几个允许代码通过编译并可以运行且无异常?() A、 0B、 1C、 2D、 3

现有:  class HorseRadish  {      //insert code here  protected HorseRadish (int x)    {      System.out.println ("bok choy");      }      }  class Wasabi extends HorseRadish  {  public static void main (String  []  args){    Wasabi w- new Wasabi();     }     }  分别插入到第2行,哪两项允许代码编译并产生”bok choy”输出结果()A、 protected HorseRadish()  {this (42);}B、  protected HorseRadish()  {}C、  //just a commentD、  protected  HorseRadish()  {  new HorseRadish (42);}

1. class Passer2 {   2. //insert code here   3. static int bigState = 42;   4. public static void main(String [] args) {   5. bigState = p2.go(bigState);   6. System.out.print(bigState);   7. }   8. int go(int x) {   9. return ++x;   10. }   11. }  和4段代码片段:  static Passer2 p2 = new Passer2();  final static Passer2 p2 = new Passer2();  private static Passer2 p2 = new Passer2();  final private static Passer2 p2 = new Passer2();  有多少行分别插入到第2行,可以编译?()  A、0B、1C、3D、4

1. class SuperFoo {  2. SuperFoo doStuff(int x) {  3. return new SuperFoo(); 4. }  5. }  6.  7. class Foo extends SuperFoo {  8. //insert code here  9. }   下面哪三项分别插入到第8行,可以编译?()A、int doStuff() { return 42; }B、int doStuff(int x) { return 42; }C、Foo doStuff(int x) { return new Foo(); }D、SuperFoo doStuff(int x) { return new Foo(); }

1. class MyThread implements Runnable {  2. public void run() {  3. System.out.print("go ");  4. }  5.  6. public static void main(String [] args) {  7. // insert code here  8. t.start(); 9. }  10. }  和如下四句:  Thread t = new MyThread(); MyThread t = new MyThread();  Thread t = new Thread(new Thread());  Thread t = new Thread(new MyThread());  分别插入到第5行,有几个可以通过编译?() A、0B、1C、2D、3

1. import java.util.*;  2. public class Example {  3. public static void main(String[] args) {  4. // insert code here  5. set.add(new integer(2));  6. set.add(new integer(l));  7. System.out.println(set);  8. }  9. }  Which code, inserted at line 4, guarantees that this program will output [1,2]? ()A、 Set set = new TreeSet();B、 Set set = new HashSet();C、 Set set = new SortedSet();D、 List set = new SortedList();E、 Set set = new LinkedHashSet();

Given classes defined in two different files:  1. package util;  2. public class BitUtils {  3. public static void process(byte[]) { /* more code here */ }  4. }  1. package app;  2. public class SomeApp {  3. public static void main(String[] args) {  4. byte[] bytes = new byte[256];  5. // insert code here  6. }  7. }  What is required at line 5 in class SomeApp to use the process method of BitUtils?() A、 process(bytes);B、 BitUtils.process(bytes);C、 util.BitUtils.process(bytes);D、 SomeApp cannot use methods in BitUtils.E、 import util.BitUtils.*; process(bytes);

1. class Animal { Animal getOne() { return new Animal(); } }  2. class Dog extends Animal {  3. // insert code here   4. }  5.  6. class AnimalTest {  7. public static void main(String [] args) {  8. Animal [] animal = { new Animal(), new Dog() } ;  9. for( Animal a : animal) {  10. Animal x = a.getOne();  11. }  12. }  13. }  和代码:  3a. Dog getOne() {  return new Dog();  }  3b. Animal getOne() {  return new Dog();  }  第 3 行中插入的哪项将编译且运行无异常?() A、3a行B、3b行C、3a行或3b行D、既非3a,也非3b

1. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()  A、 InsideOnew ei= eo.new InsideOn();B、 Eo.InsideOne ei = eo.new InsideOne();C、 InsideOne ei = EnclosingOne.new InsideOne();D、 EnclosingOne.InsideOne ei = eo.new InsideOne();

现有:  1. import java.util.*;      2.  3. Class FindStuff  {  4.public static void main (String[]args)    {      5,    //insert code here      6.    c.put ("X", 123);      7.    }      8.  } 分别插入到第5行,哪三行允许代码编译?()    A、 Map c= new SortedMap();B、 HashMap c= new HashMap();C、 HashMap c= new Hashtalole();D、 SortedMap c= new TreeMap();E、 ArrayList c= new ArrayList();F、  MaD c = new LinkedHashMap();

1. import java.util.*;  2. public class Test {  3. public static void main(String[] args) {  4. List strings = new ArrayList();  5. // insert code here  6. }  7. }  Which four, inserted at line 5, will allow compilation to succeed?()A、 String s = strings.get(0);B、 Iterator i1 = strings.iterator();C、 String[] array1 = strings.toArray();D、 Iterator i2 = strings.iterator();E、 String[] array2 = strings.toArray(new String[1]);F、 Iterator i3 = strings.iterator();

3. import java.util.*;   4. class ForInTest {   5. static List list = new ArrayList();   6.   7. public static void main(String [] args) {   8. list.add("a"); list.add("b"); list.add("c");   9. //insert code here   10. System.out.print(o);   11. }   12. }   哪一行插入到第9行将导致输出“abc”?()  A、 for(Object o : list)B、 for(Iterator o : list)C、 for(Object o : list.iterator())D、 for(Iterator o : list.iterator(); o.hasNext (); )

多选题1. import java.util.*;  2. public class Test {  3. public static void main(String[] args) {  4. List strings = new ArrayList();  5. // insert code here  6. }  7. }  Which four, inserted at line 5, will allow compilation to succeed?()AString s = strings.get(0);BIterator i1 = strings.iterator();CString[] array1 = strings.toArray();DIterator i2 = strings.iterator();EString[] array2 = strings.toArray(new String[1]);FIterator i3 = strings.iterator();

多选题现有:  class HorseRadish  {      //insert code here  protected HorseRadish (int x)    {      System.out.println ("bok choy");      }      }  class Wasabi extends HorseRadish  {  public static void main (String  []  args){    Wasabi w- new Wasabi();     }     }  分别插入到第2行,哪两项允许代码编译并产生”bok choy”输出结果()Aprotected HorseRadish()  {this (42);}Bprotected HorseRadish()  {}C//just a commentDprotected  HorseRadish()  {  new HorseRadish (42);}

多选题1. class SuperFoo {  2. SuperFoo doStuff(int x) {  3. return new SuperFoo(); 4. }  5. }  6.  7. class Foo extends SuperFoo {  8. //insert code here  9. }   下面哪三项分别插入到第8行,可以编译?()Aint doStuff() { return 42; }Bint doStuff(int x) { return 42; }CFoo doStuff(int x) { return new Foo(); }DSuperFoo doStuff(int x) { return new Foo(); }

多选题现有:   1.  class HorseRadish {   2.    // insert code here   3.    protected HorseRadish(int x) {    4.      System.out.println("bok choy");  5.    }  6.  }   7.  class Wasabi extends HorseRadish {   8.    public static void main(String [] args) {   9.      Wasabi w = new Wasabi();  10.   }    11. }   分别插入到第 2 行,哪两项允许代码编译并产生"bok choy" 输出结果?()A// just a commentBprotected HorseRadish() { }Cprotected HorseRadish() { this(42);}Dprotected  HorseRadish() { new HorseRadish (42);}

多选题现有2 个文件:  1. package x;  2. public class X {  3. public static void doX() { System.out.print("doX "); }  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”? ()AdoX();BX.doX();Cx.X.doX();Dx.X myX = new x.X(); myX.doX();

单选题1. import java.util.*;  2. public class Example {  3. public static void main(String[] args) {  4. // insert code here  5. set.add(new integer(2));  6. set.add(new integer(l));  7. System.out.println(set);  8. }  9. }  Which code, inserted at line 4, guarantees that this program will output [1,2]? ()A Set set = new TreeSet();B Set set = new HashSet();C Set set = new SortedSet();D List set = new SortedList();E Set set = new LinkedHashSet();

单选题1. import java.util.*;  2. class ForInTest {  3. static List list = new ArrayList();  4.  5. static List getList() { return list; }  6.  7. public static void main(String [] args) {  8. list.add("a"); list.add("b"); list.add("c");  9. // insert code here  10. System.out.print(o);  11. }  12. } 第 9 行插入哪一项将输出 abc?()Afor(char o: list)Bfor(Object o: getList())Cfor(Object o: getList();)Dfor(Object o: o.getList())

多选题现有:  1. import java.util.*;      2.  3. Class FindStuff  {  4.public static void main (String[]args)    {      5,    //insert code here      6.    c.put ("X", 123);      7.    }      8.  } 分别插入到第5行,哪三行允许代码编译?()AMap c= new SortedMap();BHashMap c= new HashMap();CHashMap c= new Hashtalole();DSortedMap c= new TreeMap();EArrayList c= new ArrayList();FMaD c = new LinkedHashMap();

单选题1. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()A InsideOnew ei= eo.new InsideOn();B Eo.InsideOne ei = eo.new InsideOne();C InsideOne ei = EnclosingOne.new InsideOne();D EnclosingOne.InsideOne ei = eo.new InsideOne();

多选题1. import java.util.*;  2.  3. Class FindStuff {  4. public static void  main(String [] args) {  5. // insert code here  6. c.put("x", 123);  7. }  8. } 分别插入到第5行,哪三行允许代码编译?()AMap c = new SortedMap();BHashMap c = new HashMap();CHashMap c = new Hashtable();DSortedMap c = new TreeMap();

单选题1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()A Class AB Compilation fails.C An exception is thrown at line 2.D An exception is thrown at line 6.E The code executes with no output.