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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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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.()
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单选题1. public class Employee { 2. String name; 3. double baseSalary; 4. Employee(String name, double baseSalary) { 5. this.name = name; 6. this.baseSalary = baseSalary; 7. } 8. } And: 1. public class Salesperson extends Employee { 2. double commission; 3. public Salesperson(String name, double baseSalary, 4. double commission) { 5. // insert code here 6. } 7. } Which code, inserted at line 7, completes the Salesperson constructor?()A
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super(); this.commission = commission;F
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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.
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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
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foobarfoobarfooE
barbarbarbarbarF
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foofoofoobarfoo
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填空题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 24?()
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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?()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)
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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?()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)
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