10. public Object m（） { 11. Object o = new Float（3.14F）； 12. Object [] oa = new Object[1]； 13. oa[0] = o； 14. o = null； 15. return oa[0]； 16. } When is the Float object， created in line 11， eligible for garbage collection？（） A、 Just after line 13.B、 Just after line 14.C、 Never in this method.D、 Just after line 15 （that is， as the method returns）.
10. public Object m（） { 11. Object o = new Float（3.14F）； 12. Object [] oa = new Object[1]； 13. oa[0] = o； 14. o = null； 15. return oa[0]； 16. } When is the Float object， created in line 11， eligible for garbage collection？（）
- A、 Just after line 13.
- B、 Just after line 14.
- C、 Never in this method.
- D、 Just after line 15 （that is， as the method returns）.
相关考题：
阅读下列函数说明和Java代码，将应填入(n)处的字句写在对应栏内。【说明】类Queue表示队列，类中的方法如下表所示。类Node表示队列中的元素；类EmptyQueueException给出了队列操作中的异常处理操作。public class TestMain { //主类public static viod main (String args[]){Queue q=new Queue();q.enqueue("first!");q.enqueue("second!");q.enqueue("third!");(1) {while(true)System.out.println(q.dequeue());}catch( (2) ){ }}public class Queue { //队列Node m_FirstNode;public Queue(){m_FirstNode=null;}public boolean isEmpty(){if(m_FirstNode==null)return true;else return false;}public viod enqueue(Object newNode) { //入队操作Node next=m_FirstNode;if(next==null)m_FirstNode=new Node(newNode);else{while(next.getNext()!=null)next=next.getNext();next.setNext(new node(newNode));}}public Object dequeue() (3) { //出队操作Object node;if (isEempty())(4); //队列为空, 抛出异常else{node=m_FirstNode.getObject();m_FirstNode=m_FirstNode.getNext();return node;}}}public class Node{ //队列中的元素Object m_Data;Node m_Next;public Node(Object data) {m_Data=data; m_Next=null;}public Node(Object data, Node next) {m_Data=data; m_Next=-next;}public void setObject(Object data) {m_Data=data;}public Object getObject(Object data) {return m_data;}public void setNext(Node next) {m_Next=next;}public Node getNext() {return m_Next;}}public class EmptyQueueException extends (5) { //异常处理类public EmptyQueueException() {System.out.println("队列已空! ");}}
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
Given:Which two, inserted at line 11, will allow the code to compile?() A.public class MinMax? {B.public class MinMax? extends Number {C.public class MinMaxN extends Object {D.public class MinMaxN extends Number {E.public class MinMax? extends Object {F.public class MinMaxN extends Integer {
Given:Which method will complete this class?() A.public int compareTo(Object o){/*more 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*/}
以下程序的输出结果是_____。 include class object {private:int val; public:objec 以下程序的输出结果是_____。include＜iostream.h＞class object{ private:int val;public:object( ) ;object(int i) ;～object( ) ;};object: :object( ){ val＝0;cout ＜ ＜ "Default constructor for object" ＜ ＜ endl;}object: :object(int i){ val＝i;cout ＜ ＜ "Constructor for object" ＜ ＜ val ＜ ＜ endl;}object: :～object( ){ cout ＜ ＜ "Destructor for object" ＜ ＜ val ＜ ＜ endl;}class container{ private:object one;object two;int data;public:container( ) ;container(int i,int j,int k) ;～container( ) ;};container: :container( ){ data＝0;cout ＜ ＜ "Default constructor for container" ＜ ＜ endl;}container: :container(int i,int j,int k) :two(i) ,one(j){ data＝k;cout ＜ ＜ "Constructor for container" ＜ ＜ endl;}container: :～container( ){ cout ＜ ＜ "Destructor for container" ＜ ＜ endl;}void main( ){ container anObj(5,6,10) ;}
把一个对象写到一个流中相对比较简单，具体是通过调用ObjectOutputStream类的writeObject()方法实现的，那么该方法的定义为( )。A．public final int writeObject(Object obj) throws IOExceptionB．public final void writeObject(Object obj) throws IOExceptionC．public Object writeObject(Object obj) throws IOExceptionD．public final Object writeObject(Object obj) throws IOException
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.
在j2ee中，以下是firevetoablechange方法的正确的原型的是（） A、public void fireVetoableChange（Object oldValue，Object newValue）B、 public void fireVetoableChange（String propertyName，Object newValue）C、 public void fireVetoableChange（String propertyName， Object oldValue ，Object newValue）throws PropertyVetoExceptionD、 public void fireVetoableChange（String propertyName， Object oldValue ，Object newValue）
在J2EE中，以下是firePropertyChange的原型，正确的是（）。 A、public void firePropertyChange（PropertyChangeListener l，String oldValue， String newValue）B、public void firePropertyChange（String propertyName， Object oldValue， Object newValue）C、public void firePropertyChange（PropertyChangeSupport changes）D、public void firePropertyChange（Object oldValue， Object newValue）
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
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*/} }
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）.
Given an ActionEvent， which method allows you to identify the affected Component？（） A、 Public class getClass（）B、 Public Object getSource（）C、 Public Component getSource（）D、 Public Component getTarget（）E、 Public Component getComponent（）F、 Public Component getTargetComponent（）
1.public class Test { 2.public static void main （String args[]） { 3.class Foo { 4.public int i = 3； 5.} 6.Object o = （Object） new Foo（）； 7.Foo foo = （Foo）o； 8.System.out.printIn（foo. i）； 9. } 10.} 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.
public class Key { private long id1； private long 1d2； // class Key methods } A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）A、 public int hashCode（）B、 public boolean equals（Key k）C、 public int compareTo（Object o）D、 public boolean equals（Object o）E、 public boolean compareTo（Key k）
10. class Line { 11. public class Point { public int x，y； } 12. public Point getPoint（） { return new Point（）； } 13. } 14. class Triangle { 15. public Triangle（） { 16. // insert code here 17. } 18. } Which code， inserted at line 16， correctly retrieves a local instance of a Point object？（） A、 Point p = Line.getPoint（）；B、 Line.Point p = Line.getPoint（）；C、 Point p = （new Line（））.getPoint（）；D、 Line.Point p = （new Line（））.getPoint（）；
单选题Given an ActionEvent， which method allows you to identify the affected Component？（）A Public class getClass（）B Public Object getSource（）C Public Component getSource（）D Public Component getTarget（）E Public Component getComponent（）F Public Component getTargetComponent（）
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）.
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）.
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？（）ALine5BLine6CLine7DLine8ELine9FLine10
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*/} }
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.
单选题10. class Line { 11. public class Point { public int x，y； } 12. public Point getPoint（） { return new Point（）； } 13. } 14. class Triangle { 15. public Triangle（） { 16. // insert code here 17. } 18. } Which code， inserted at line 16， correctly retrieves a local instance of a Point object？（）A Point p = Line.getPoint（）；B Line.Point p = Line.getPoint（）；C Point p = （new Line（））.getPoint（）；D Line.Point p = （new Line（））.getPoint（）；
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
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*/}
单选题1.public class Test { 2.public static void main （String args[]） { 3.class Foo { 4.public int i = 3； 5.} 6.Object o = （Object） new Foo（）； 7.Foo foo = （Foo）o； 8.System.out.printIn（foo. i）； 9. } 10.} 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.
单选题在j2ee中，以下是firevetoablechange方法的正确的原型的是（）Apublic void fireVetoableChange（Object oldValue，Object newValue）B public void fireVetoableChange（String propertyName，Object newValue）C public void fireVetoableChange（String propertyName， Object oldValue ，Object newValue）throws PropertyVetoExceptionD public void fireVetoableChange（String propertyName， Object oldValue ，Object newValue）