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单选题
1. public class X {  2. public object m ()  {  3. object o = new float (3.14F);  4. object [] oa = new object [1]; 5. oa[0]= o;  6. o = null;  7. oa[0] = null;  10. return o;  9. }  10. }  When is the float object created in line 3, eligible for garbage collection?()
A

 Just after line 5.

B

 Just after line 6.

C

 Just after line 7.

D

 Just after line 8(that is, as the method returns).


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更多 “单选题1. public class X {  2. public object m ()  {  3. object o = new float (3.14F);  4. object [] oa = new object [1]; 5. oa[0]= o;  6. o = null;  7. oa[0] = null;  10. return o;  9. }  10. }  When is the float object created in line 3, eligible for garbage collection?()A  Just after line 5.B  Just after line 6.C  Just after line 7.D  Just after line 8(that is, as the method returns).” 相关考题
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考题 You work as an application developer at Certkiller .com. Certkiller .com has instructed you to create a class named MetricFormula. This class will be used to compare MetricUnit and EnglishUnit objects.The MetricFormula is currently defined as follows (Line numbers are used for reference purposes only): 1. public class MetricFormula2. { 3. 4. } You need to ensure that the MetricFormula class can be used to compare the required objects. What should you do? ()A、 Add the following code on line 1: : IComparable {B、 Add the following code on line 1: : IComparer {C、 Add the following code on line 3: public int Compare (object x, object y) {// implementation code }D、 Add the following code on line 3: public int CompareTo (object obj) {// implementation code }

考题 单选题public class X {   public object m () {   object o = new float (3.14F);   object oa = new object [1];   oa[0]= o;   o = null;   oa[0] = null;   return o;   }   }   When is the float object created in line 3, eligible for garbage collection?()A  Just after line 5.B  Just after line 6.C  Just after line 7.D  Just after line 8(that is, as the method returns).

考题 单选题1.public class GC{ 2.private Objec to; 3.private void doSomethingElse(Object obj){o=obj;} 4.public void doSomething(){ 5.Object o=new Object(); 6.doSomethingElse(o); 7.o=new Object(); 8.doSomethingElse(null); 9.o=null; 10.} 11.} When the doSomething method is called,after which line does the Object created in line 5 become available for garbage collection?()A Line5B Line6C Line7D Line8E Line9F Line10

考题 单选题下列代码正确的是哪项?()A  public class Session implements Runnable, Clonable{   public void run ();public Object clone () ; }B  public class Session extends Runnable, Cloneable {  public void run() {/*dosomething*/}       public Object clone() {/*make a copy*/} }C  public abstract class Session implements Runnable, Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}        }D  public class Session implements Runnable, implements Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}       }

考题 单选题public class Test {   public static void main (String args) {   class Foo {   public int i = 3;  }   Object o = (Object) new Foo();   Foo foo = (Foo)o;   System.out.printIn(foo. i);  }   }   What is the result?()A  Compilation will fail.B  Compilation will succeed and the program will print “3”C  Compilation will succeed but the program will throw a ClassCastException at line 6.D  Compilation will succeed but the program will throw a ClassCastException at line 7.

考题 单选题1. public class X (  2. public object m ()  {  3. object o = new float (3.14F);  4. object [] oa = new object [1];  5. oa[0]= o;  6. o = null;  7. return oa[0];  8. }  9. }   When is the float object created in line 3, eligible for garbage collection?()A  Just after line 5B  Just after line 6C  Just after line 7 (that is, as the method returns)D  Never in this method.

考题 单选题public class X {  public object m () {   object o = new float (3.14F);   object oa = new object [1];   oa[0]= o;   o = null;   return oa[0];   }   }   When is the float object created in line 3, eligible for garbage collection?()A  Just after line 5B  Just after line 6C  Just after line 7 (that is, as the method returns)D  Never in this method.

考题 多选题Given:  1.  public class ConstOver {  2.  public constOver(int x, int y, int z) {  3.  }  4.  }   Which two overload the ConstOver Constructor?()AConstOver() {}Bprotected int ConstOver(){}Cprivate ConstOver(int z, int y, byte x ) {}Dpublic Object ConstOver(Int x, int y, int z) {}Epubic void ConstOver (byte x, byte y, byte z) {}

考题 单选题public class Test {  public static void main(String args[]) {  class Foo {  public int i = 3; }  Object o = (Object)new Foo();   Foo foo = (Foo)o;  System.out.println(“i = “ + foo.i); }  }  What is the result?()A  i = 3B  Compilation fails.C  A ClassCastException is thrown at line 6.D  A ClassCastException is thrown at line 7.

考题 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?()A for(char o: list)B for(Object o: getList())C for(Object o: getList();)D for(Object o: o.getList())

考题 单选题1. public class GC {  2. private Object o;  3. private void doSomethingElse(Object obj) { o = obj; }  4. public void doSomething() {  5. Object o = new Object();  6. doSomethingElse(o);  7. o = new Object();  8. doSomethingElse(null);  9.o=null;  10. }  11. }  When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?()A  Line 5B  Line 6C  Line 7D  Line 8E  Line 9F  Line 10

考题 单选题public class Score implements Comparable {  private int wins, losses;  public Score(int w, int 1) { wins = w; losses = 1; }  public int getWins() { return wins; }  public int getLosses() { return losses; }  public String toString() {  return “”; }  // insert code here  }  Which method will complete this class?()A  public int compareTo(Object o) {/*mode code here*/}B  public int compareTo(Score other) {/*more code here*/}C  public int compare(Score s1,Score s2){/*more code here*/}D  public int compare(Object o1,Object o2){/*more code here*/}