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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).


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更多 “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).” 相关考题
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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public class Drink implements Comparable {  public String name;  public int compareTo(Object o) {  return 0;  }  }  and:  Drink one = new Drink();  Drink two = new Drink();  one.name= “Coffee”;  two.name= “Tea”;  TreeSet set = new TreeSet();  set.add(one);  set.add(two);  A programmer iterates over the TreeSet and prints the name of each Drink object. What is the result?()A  TeaB  CoffeeC  Coffee TeaD  Compilation fails.E  The code runs with no output.F  An exception is thrown at runtime.

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*/}       }

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考题 单选题package geometry;  public class Hypotenuse {  public InnerTriangle it = new InnerTriangle();  class InnerTriangle {  public int base;  public int height;  }  }  Which is true about the class of an object that can reference the variable base? ()A  It can be any class.B  No class has access to base.C  The class must belong to the geometry package.D  The class must be a subclass of the class Hypotenuse.

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 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. 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

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