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单选题
Given a method that must ensure that its parameter is not null: 11. public void someMethod(Object value) { 12. // check for null value ... 20. System.out.println(value.getClass()); 21. } What inserted at line 12, is the appropriate way to handle a null value?()
A
assert value == null;
B
assert value != null, value is null;
C
if (value == null) { throw new AssertionException(value is null); }
D
if (value == null) { throw new IllegalArgumentException(value is null); }
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更多 “单选题Given a method that must ensure that its parameter is not null: 11. public void someMethod(Object value) { 12. // check for null value ... 20. System.out.println(value.getClass()); 21. } What inserted at line 12, is the appropriate way to handle a null value?()A assert value == null;B assert value != null, value is null;C if (value == null) { throw new AssertionException(value is null); }D if (value == null) { throw new IllegalArgumentException(value is null); }” 相关考题
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Givenamethodthatmustensurethatitsparameterisnotnull:What,insertedatline12,istheappropriatewaytohandleanullvalue?()
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publicvoidsomeMethod(Objectvalue){12.//checkfornullvalue....20.System.out.println(value.getClass());21.}What,insertedatline12,istheappropriatewaytohandleanullvalue?()
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Givenamethodthatmustensurethatitsparameterisnotnull:11.publicvoidsomeMethod(Objectvalue){12.//checkfornullvalue...20.System.out.println(value.getClass());21.}Whatinsertedatline12,istheappropriatewaytohandleanullvalue?()A.assertvalue==null;B.assertvalue!=null,valueisnull;C.if(value==null){thrownewAssertionException(valueisnull);}D.if(value==null){thrownewIllegalArgumentException(valueisnull);}
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考题
11. public void someMethod(Object value) { 12. // check for null value .... 20. System.out.println(value.getClass()); 21. } What, inserted at line 12, is the appropriate way to handle a null value?() A、 assert value == null;B、 assert value !null, “value is null”;C、 if (value == null) { throw new AssertionException(”value is null”);D、 if (value == null) { throw new IllegalArgumentException(”value is null”);
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Given: 11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()A、 Line 19B、 The object is NOT a candidate for garbage collection.C、 Line 17D、 Line 16E、 Line 18
考题
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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).
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Given a method that must ensure that its parameter is not null: 11. public void someMethod(Object value) { 12. // check for null value ... 20. System.out.println(value.getClass()); 21. } What inserted at line 12, is the appropriate way to handle a null value?()A
assert value == null;B
assert value != null, value is null;C
if (value == null) { throw new AssertionException(value is null); }D
if (value == null) { throw new IllegalArgumentException(value is null); }
考题
单选题public static void main(String[]args){ String str="null"; if(str==null){ System.out.println("null"); }else(str.length()==0){ System.out.println("zero"); }else{ System.out.println("some"); } } What is the result?()A
nullB
zeroC
someD
Compilationfails.E
Anexceptionisthrownatruntime.
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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
多选题Given: 11. // insert code here 12. private N min, max; 13. public N getMin() { return min; } 14. public N getMax() { return max; } 15. public void add(N added) { 16. if (min == null || added.doubleValue() max.doubleValue()) 19. max = added; 20. } 21. } Which two, inserted at line 11, will allow the code to compile?()AABBCCDDEEFF
考题
单选题Given the definition of MyServlet: 11.public class MyServlet extends HttpServlet { 12.public void service(HttpServletRequest request, 13.HttpServletResponse response) 14.throws ServletException, IOException { 15.HttpSession session = request.getSession(); 16.session.setAttribute("myAttribute","myAttributeValue"); 17.session.invalidate(); 18.response.getWriter().println("value=" + 19.session.getAttribute("myAttribute")); 20.} 21.} What is the result when a request is sent to MyServlet?()A
An IllegalStateException is thrown at runtime.B
An InvalidSessionException is thrown at runtime.C
The string value=null appears in the response stream.D
The string value=myAttributeValue appears in the response stream.
考题
单选题Given: 11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()A
Line 19B
The object is NOT a candidate for garbage collection.C
Line 17D
Line 16E
Line 18
考题
单选题12. void start() { 13. A a = new A(); 14. B b = new B(); 15. a.s(b); 16. b = null; 17. a = null; 18. System.out.println(“start completed”); 19. } When is the B object, created in line 14, eligible for garbage collection?()A
After line 16.B
After line 17.C
After line 18 (when the methods ends).D
There is no way to be absolutely certain.E
The object is NOT eligible for garbage collection.
考题
单选题11. public void someMethod(Object value) { 12. // check for null value .... 20. System.out.println(value.getClass()); 21. } What, inserted at line 12, is the appropriate way to handle a null value?()A
assert value == null;B
assert value !null, “value is null”;C
if (value == null) { throw new AssertionException(”value is null”);D
if (value == null) { throw new IllegalArgumentException(”value is null”);
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