5. String foo = “base”;   6. foo.substring(0,3);   7. foo.concat(“ket”)  8.   Type the value of foo at line 8.()

5. String foo = “base”;   6. foo.substring(0,3);   7. foo.concat(“ket”)  8.   Type the value of foo at line 8.()


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public class test(  public static void main(string[]args){  string foo = args [1];  string foo = args [2];  string foo = args [3];  }  )  And command line invocation: Java Test red green blue   What is the result?()  A、 Baz has the value of “”B、 Baz has the value of nullC、 Baz has the value of “red”D、 Baz has the value of “blue”E、 Bax has the value of “green”F、 The program throws an exception.

public class Base {  public static final String FOO = “foo”;  public static void main(String[] args) {  Base b = new Base();  Sub s = new Sub();  System.out.print(Base.FOO);  System.out.print(Sub.FOO);  System.out.print(b.FOO);  System.out.print(s.FOO);  System.out.print(((Base)s).FOO);  } }  class Sub extends Base {public static final String FOO=bar;}  What is the result?() A、 foofoofoofoofooB、 foobarfoobarbarC、 foobarfoofoofooD、 foobarfoobarfooE、 barbarbarbarbarF、 foofoofoobarbarG、 foofoofoobarfoo

int index = 1;   String test = new String;   String foo = test[index];  What is the result?()A、 Foo has the value “”B、 Foo has the value nullC、 An exception is thrownD、 The code will not compile

1. public class Test { 2. public static String output =””; 3.  4. public static void foo(int i) { 5. try { 6. if(i==1) { 7. throw new Exception(); 8. } 9. output += “1”; 10. } 11. catch(Exception e) { 12. output += “2”; 13. return; 14. } 15. finally { 16. output += “3”;17. } 18. output += “4”; 19. } 20.  21. public static void main(String args[]) { 22. foo(0); 23. foo(1); 24.  25. }26. } What is the value of the variable output at line 23?()

1. interface foo {  2. int k = 0;  3. } 4.    5. public class test implements Foo (  6. public static void main(String args[]) (  7. int i;  8. Test test = new test ();  9. i= test.k;  10.i= Test.k;  11.i= Foo.k;  12.)  13.)  14.        What is the result?()  A、 Compilation succeeds.B、 An error at line 2 causes compilation to fail.C、 An error at line 9 causes compilation to fail.D、 An error at line 10 causes compilation to fail.E、 An error at line 11 causes compilation to fail.

1. class SuperFoo {  2. SuperFoo doStuff(int x) {  3. return new SuperFoo(); 4. }  5. }  6.  7. class Foo extends SuperFoo {  8. //insert code here  9. }   下面哪三项分别插入到第8行,可以编译?()A、int doStuff() { return 42; }B、int doStuff(int x) { return 42; }C、Foo doStuff(int x) { return new Foo(); }D、SuperFoo doStuff(int x) { return new Foo(); }

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.

2. public class Foo implements Runnable (  3. public void run (Thread t) {  4. system.out.printIn(“Running.”);  5. }  6. public static void main (String[] args)  {  7. new thread (new Foo()).start(); 8. )  9. )   What is the result?()      A、 An exception is thrown.B、 The program exists without printing anything.C、 An error at line 1 causes compilation to fail.D、 An error at line 6 causes the compilation to fail.E、 “Running” is printed and the program exits.

Given the JSP code: % request.setAttribute("foo", "bar"); %and the Classic tag handler code: 5. public int doStartTag() throws JspException { 6. // insert code here 7. // return int 8. } Assume there are no other "foo" attributes in the web application. Which invocation on the pageContextobject,inserted at line 6,assigns "bar" to the variable x?()A、String x = (String) pageContext.getAttribute("foo")B、String x = (String) pageContext.getRequestScope("foo")C、It is NOT possible to access the pageContext object from within doStartTagD、String x = (String) pageContext.getRequest().getAttribute("foo")E、String x = (String) pageContext.getAttribute("foo", PageContext.ANY_SCOPE)

3. string foo = “ABCDE”;  4. foo.substring(3);   5. foo.concat(“XYZ”);   6.   Type the value of foo at line 6.()

public class test(   public static void main(stringargs){   string foo = args [1];   string foo = args ;   string foo = args ;   }   )   And command line invocation:  Java Test red green blue  What is the result? () A、 Baz has the value of “”B、 Baz has the value of nullC、 Baz has the value of “red”D、 Baz has the value of “blue”E、 Bax has the value of “green”F、 The program throws an exception.

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.

int index = 1;  String [] test = new String[3];  String foo = test[index];     What is the result?()  A、 Foo has the value “”B、 Foo has the value nullC、 An exception is thrownD、 The code will not compile

填空题5. String foo = “base”;  6. foo.substring(0,3);  7. foo.concat(“ket”)  8.     Type the value of foo at line 8.()

填空题3. string foo = “ABCDE”;  4. foo.substring(3);  5. foo.concat(“XYZ”);  6.     Type the value of foo at line 6.()

单选题public class test(  public static void main(string[]args){  string foo = args [1];  string foo = args [2];  string foo = args [3];  }  )  And command line invocation: Java Test red green blue   What is the result?()A Baz has the value of “”B Baz has the value of nullC Baz has the value of “red”D Baz has the value of “blue”E Bax has the value of “green”F The program throws an exception.

单选题int index = 1;  String [] test = new String[3];  String foo = test[index];     What is the result?()A Foo has the value “”B Foo has the value nullC An exception is thrownD The code will not compile

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.

单选题2. public class Foo implements Runnable (  3. public void run (Thread t) {  4. system.out.printIn(“Running.”);  5. }  6. public static void main (String[] args)  {  7. new thread (new Foo()).start(); 8. )  9. )   What is the result?()A An exception is thrown.B The program exists without printing anything.C An error at line 1 causes compilation to fail.D An error at line 6 causes the compilation to fail.E “Running” is printed and the program exits.

单选题int index = 1;   String test = new String;   String foo = test[index];  What is the result?()A Foo has the value “”B Foo has the value nullC An exception is thrownD The code will not compile

单选题public class test(   public static void main(stringargs){   string foo = args [1];   string foo = args ;   string foo = args ;   }   )   And command line invocation:  Java Test red green blue  What is the result? ()A Baz has the value of “”B Baz has the value of nullC Baz has the value of “red”D Baz has the value of “blue”E Bax has the value of “green”F The program throws an exception.

单选题Which retrieves the value associated with “foo” from within an HttpServlet?()A  String value = getServletConfig( ).getParameter(“foo”);B  String value = getServletContext( ).getAttribute(“foo”);C  Object value = getServletContext( ).getInitParameter(“foo”);D  String value = getServletContext( ).getInitParameter(“foo”)

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.

多选题Given: 6. 7. 8. and a custom tag handler for foo which extends TagSupport. Which two are true about thetag handler referenced by foo?()AThe doStartTag method is called once.BThe doAfterBody method is NOT called.CThe EVAL_PAGE constant is a valid return value for the doEndTag method.DThe SKIP_PAGE constant is a valid return value for the doStartTag method.EThe EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.

单选题Given the JSP code: and the Classic tag handler code: 5. public int doStartTag() throws JspException { 6. // insert code here 7. // return int 8. } Assume there are no other "foo" attributes in the web application. Which invocation on the pageContextobject,inserted at line 6,assigns "bar" to the variable x?()AString x = (String) pageContext.getAttribute(foo)BString x = (String) pageContext.getRequestScope(foo)CIt is NOT possible to access the pageContext object from within doStartTagDString x = (String) pageContext.getRequest().getAttribute(foo)EString x = (String) pageContext.getAttribute(foo, PageContext.ANY_SCOPE)

单选题public class Base {  public static final String FOO = “foo”;  public static void main(String[] args) {  Base b = new Base();  Sub s = new Sub();  System.out.print(Base.FOO);  System.out.print(Sub.FOO);  System.out.print(b.FOO);  System.out.print(s.FOO);  System.out.print(((Base)s).FOO);  } }  class Sub extends Base {public static final String FOO=bar;}  What is the result?()A foofoofoofoofooB foobarfoobarbarC foobarfoofoofooD foobarfoobarfooE barbarbarbarbarF foofoofoobarbarG foofoofoobarfoo

单选题Given the JSP code: and the Classic tag handler code: 5. public int doStartTag() throws JspException { 6. // insert code here 7. // return int 8. } Assume there are no other "foo" attributes in the web application. Which invocation on the pageContextobject,inserted at line 6,assigns "bar" to the variable x?()AString x = (String) pageContext.getAttribute(foo)BString x = (String) pageContext.getRequestScope(foo)CIt is NOT possible to access the pageContext object from within doStartTagDString x = (String) pageContext.getRequest().getAttribute(foo)EString x = (String) pageContext.getAttribute(foo, PageContext.ANY_SCOPE)