Just after line 5.
Just after line 6.
Just after line 7.
Just after line 8(that is, as the method returns).
第1题:
A.public class MinMax<?> {
B.public class MinMax<? extends Number> {
C.public class MinMax<N extends Object> {
D.public class MinMax<N extends Number> {
E.public class MinMax<? extends Object> {
F.public class MinMax<N extends Integer> {
第2题:
阅读以下说明和Java代码,将应填入(n)处的字句写在答题纸的对应栏内。
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。
Java 代码
public class TestMain{ // 主类
public static void 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 void 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 (isEmpty())
(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 getObject0 { 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 EmptyQueueException0 {
System.out.println("队列已空 ! ");
}
}
第3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! ");
}
}
第4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?()
第5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?()
第6题:
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*/}
第7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?()
第8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.Line5
B.Line6
C.Line7
D.Line8
E.Line9
F.Line10
第9题:
下列代码正确的是哪项?()
第10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? ()