JAVA MULTIPLE CHOICE QUESTION Check your Knowledge Press
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JAVA MULTIPLE CHOICE QUESTION
Check your Knowledge Press to Start www. prolearninghub. com
1. Which interface provides the capability to store objects using a key-value pair? Java. util. Map Java. util. Set Java. util. List Java. util. Collection www. prolearninghub. com
2. Which one is not a correct declaration of a class? final public class Test {} class $Test{} static class Test {} public abstract class _Test {} www. prolearninghub. com
3. How can such a restriction be enforced? A method within a class is only accessible by classes that are defined within the same package as the class of the Declare the method with the keyword public Declare the method with keyword private Declare the method with keyword protected Without any accessibility specifiers. www. prolearninghub. com
4. The name of the method used to initialize a class object? Abstract method Static method Constructor Overloaded method www. prolearninghub. com
5. What should be met for two methods to be overloaded? condition Same name and same number of parameter but different return type. They have same name. They have different name but same number of argument. Have same name but different parameters. www. prolearninghub. com
6. Which statement does not create an object of class Student {}? new Student(); Student s 1 = new Student(), s 2 = new Student(); Student s 1; Student ss = new Student s 1; t(); www. prolearninghub. com
7. ____ is used to refer a current class object Public This Static None of these www. prolearninghub. com
8. Garbage Collection in java is done by whom? Java compiler Object class JVM System class www. prolearninghub. com
9. const int x = 10; Is this statement is correct declaration of constant in java. NO Yes www. prolearninghub. com
10. Can you make constructor final? Yes No www. prolearninghub. com
11. Given the following code, which line will generate an error? class Test { static int x = 100; // line 3 int y = 200; // line 4 public static void main(String []args) { final int z; // line 7 z = x + y; // line 8 System. out. println(z); } } Line 3 Line 7 Line 4 Line 8 www. prolearninghub. com
12. What is the most restrictive access modifier that will allow members of one class to have access to members of another class in the same package? Public Abstract Protected Default access www. prolearninghub. com
13. Which of the following is/are legal method declarations? Protected abstract void m 1(); static final void m 1(){}; synchronized public final void m 1() {} Private native void m 1() www. prolearninghub. com
14. String is a Java? Class Object Variable Character array www. prolearninghub. com
15. Which of this method of String class is used to obtain character at specified index? char() Charat() char. At() www. prolearninghub. com
16. isequal() is used to: equalize two strings concat two strings count no of characters none of above www. prolearninghub. com
17. String object can create: (Choose all that apply) 1) 2) 3) 4) by string literal by new keyword by final keyword none of mentioned 3; 2 1; 2 3; 4 2; 4 www. prolearninghub. com
18. What will be the output for this program? java, string, example public class String. Example{ public static void main(String args[]){ String s 1="java"; char ch[]={'s', 't', 'r', 'i', 'n', 'g', 's'}; String s 2=new String(ch); String s 3=new String("example"); System. out. println(s 1); System. out. println(s 2); System. out. println(s 3); }} string, example, java, string , java, example www. prolearninghub. com
19. The method used to return char value for a particular index is: length() substring() char. At() contains() www. prolearninghub. com
20. The method used to return string length: length() substring() char. At() www. prolearninghub. com
21. The method used to return formatted length: length() join() format() isemptxy() www. prolearninghub. com
22. Immutable object is a object that cannot be changes when it is created? Yes No www. prolearninghub. com
23. The memory which store string object is known as? Heap Stack String constant pool Method area www. prolearninghub. com
import my. Library. *; public class Show. Some. Class { // code for the class. . . } 24. What is the name of the java file containing this program? my. Library. java Show. Some. Class. class www. prolearninghub. com
25. Consider the following code snippet String river = new String(‘ USA ’); System. out. println (river. length()); What is printed? 2 3 4 5 www. prolearninghub. com
26. If s = “This is java” what will be returned by s. length() function? 9 10 11 12 www. prolearninghub. com
27. What is the difference between a Text. Area and a Text. Field? A Text. Area can handle multiple lines of text A Text. Area can be used for output Text. Area is not a class Text. Areas are used for displaying graphics www. prolearninghub. com
28. What keyword is sued to define a package? Package Void package New package None of mentioned www. prolearninghub. com
29. ____ is a multi-way branch statement? Switch Continue Break Label www. prolearninghub. com
30. integer. set. Double (2. 0*5. 5+3. 2). What datatype integer has? Text field Double field Int field double www. prolearninghub. com
31. What do you mean by a compound statement? A collection of one or more statements enclosed in braces A statement involving if and else A way of declaring variables A way of setting the value of a variable www. prolearninghub. com
32. What will be the result of this code? String str = "Study. Tonight"; str. concat(". com"); s tr = str. to. Upper. Case(); str. replace("TONIGHT", "today"); System. out. println(str) STUDYTONIGHT STUDYtoday. com STUDYTONIGHT. COM STUDYtoday www. prolearninghub. com
33. String str = new String (“hello world”); How many object this code will create? 0 2 1 3 www. prolearninghub. com
34. Which method is used to convert a primitive type into String? value. Of () to. String() to. Char() None of above www. prolearninghub. com
35. Trim function is used? To count spaces To add spaces None of the mentioned www. prolearninghub. com
36. What will be the output for this code? String str = "java is a object oriented language"; System. out. println(str. substring(1 6)); Java is a Object oriented language Language www. prolearninghub. com
37. What will happen if you try to compile and run the following code? public class My. Class { public static void main(String arguments[]) { } public void amethod(String[] arguments) Error can’t make static reference to void method. Error method main not correct Error array must include parameter A method must be declared with String www. prolearninghub. com
38. What will be the output for this code? String str = "Java developer"; String. Buffer sb = new String. Buffer(); for(int i=0; i < str. length(); i++) sb. append(str. char. At(i)); System. out. println(sb); It will not print anything It will print java It will print Java developer Error www. prolearninghub. com
39. What will be the output for this code? class Testimmutablestring{ public static void main(String args[]){ String s="Bill"; s. concat(" Clinton"); System. out. println(s); Bill Clinton Bil clin Bill Clinton www. prolearninghub. com
40. What will be the output for this code? class Testimmutablestring 1{ public static void main(String args[]){ String s="Bill"; s=s. concat(" Clinton"); System. out. println(s); Bill Clinton None of mentioned www. prolearninghub. com
41. = = operator is used: To equalize To concatenation To truncate None of these www. prolearninghub. com
42. What will be the output for this program? class Test{ public static void main(String args[]){ String a="Obama"; String b="Obama"; String c="Halary"; System. out. println(a. compare. To(b)); System. out. println(a. compare. To(c)); System. out. println(c. compare. To(a)); 0 1 1 0 -1 1 0 0 0 1 1 1 www. prolearninghub. com
43. What is the base class for all exception? java. lang. Exception java. lang. Throwable java. lang. Divide. By. Zero. Excep tion java. lang. Arithmetic. Exceptio n www. prolearninghub. com
44. Which type of exception will be thrown when you run this code? int a = 100, b = 0; int c = a/b; java. lang. Exception java. lang. Throwable java. lang. Divide. By. Zero. Excep tion java. lang. Arithmetic. Exceptio n www. prolearninghub. com
45. What will happen when an exception occurs inside your code? Program will terminate without showing any result. Program will terminate showing any error message. Java will provide a default exception handler, which will print the exception details on the terminal. System crashes. www. prolearninghub. com
46. There are _____ types of exceptions? 3 4 6 5 www. prolearninghub. com
47. Null pointer exception is _____ exception? Checked Unchecked Error None of these www. prolearninghub. com
48. IO exception is _____? Checked exception Unchecked exception Error None of mentioned www. prolearninghub. com
49. What should replace XXXX ? class My. Exception extends Exception { public void method() throws XXXX { throw new My. Exception(); Error My exception Runtime exception Throws clause isn’t required www. prolearninghub. com
50. Which of the following is not a valid way to create String object? String str 2 = new String(new char[]{'a', 'b', 'c'}); String str = new String("abc"); String str 1 = "abc"; String str 3 = 'a'+'b'+'c'; www. prolearninghub. com
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