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MCQOPTIONS
This section includes 1671 Mcqs, each offering curated multiple-choice questions to sharpen your Technical Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1051. |
Default Serialization process cannot be overridden. |
| A. | True |
| B. | false |
| Answer» C. | |
| 1052. |
If member does not implement serialization, which exception would be thrown? |
| A. | RuntimeException |
| B. | SerializableException |
| C. | NotSerializableException |
| D. | UnSerializedException |
| Answer» D. UnSerializedException | |
| 1053. |
What type of members are not serialized? |
| A. | Private |
| B. | Protected |
| C. | Static |
| D. | Throwable |
| Answer» D. Throwable | |
| 1054. |
How many methods Serializable has? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» E. | |
| 1055. |
What is deserialization? |
| A. | Turning object in memory into stream of bytes |
| B. | Turning stream of bytes into an object in memory |
| C. | Turning object in memory into stream of bits |
| D. | Turning stream of bits into an object in memory |
| Answer» C. Turning object in memory into stream of bits | |
| 1056. |
No object is serializable |
| A. | Turning object in memory into stream of bytes |
| B. | Turning stream of bytes into an object in memory |
| C. | Turning object in memory into stream of bits |
| D. | Turning stream of bits into an object in memory |
| Answer» B. Turning stream of bytes into an object in memory | |
| 1057. |
How an object can become serializable? |
| A. | If class implements java.io.Serializable class |
| B. | If class or any superclass implements java.io.Serializable interface |
| C. | Any object is serializable |
| D. | No object is serializable |
| Answer» C. Any object is serializable | |
| 1058. |
What is the output of this program? import java.io.*; class streams { public static void main(String[] args) { try { FileOutputStream fos = new FileOutputStream("serial"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeFloat(3.5); oos.flush(); oos.close(); } catch(Exception e) { System.out.println("Serialization" + e); System.exit(0); } try { float x; FileInputStream fis = new FileInputStream("serial"); ObjectInputStream ois = new ObjectInputStream(fis); x = ois.readInt(); ois.close(); System.out.println(x); } catch (Exception e) { System.out.print("deserialization"); System.exit(0); } } } |
| A. | 3 |
| B. | 3.5 |
| C. | serialization |
| D. | deserialization |
| Answer» C. serialization | |
| 1059. |
What is the output of this program? import java.io.*; class Chararrayinput { public static void main(String[] args) { String obj = "abcdefgh"; int length = obj.length(); char c[] = new char[length]; obj.getChars(0, length, c, 0); CharArrayReader input1 = new CharArrayReader(c); CharArrayReader input2 = new CharArrayReader(c, 1, 4); int i; int j; try { while ((i = input1.read()) == (j = input2.read())) { System.out.print((char)i); } } catch (IOException e) { e.printStackTrace(); } } } |
| A. | abc |
| B. | abcd |
| C. | abcde |
| D. | None of the mentioned |
| Answer» E. | |
| 1060. |
What is the output of this program? import java.io.*; class serialization { public static void main(String[] args) { try { Myclass object1 = new Myclass("Hello", -7, 2.1e10); FileOutputStream fos = new FileOutputStream("serial"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(object1); oos.flush(); oos.close(); } catch(Exception e) { System.out.println("Serialization" + e); System.exit(0); } try { int x; FileInputStream fis = new FileInputStream("serial"); ObjectInputStream ois = new ObjectInputStream(fis); x = ois.readInt(); ois.close(); System.out.println(x); } catch (Exception e) { System.out.print("deserialization"); System.exit(0); } } } class Myclass implements Serializable { String s; int i; double d; Myclass(String s, int i, double d) { this.d = d; this.i = i; this.s = s; } } |
| A. | -7 |
| B. | Hello |
| C. | 2.1E10 |
| D. | deserialization |
| Answer» E. | |
| 1061. |
What is the output of this program? import java.io.*; class serialization { public static void main(String[] args) { try { Myclass object1 = new Myclass("Hello", -7, 2.1e10); FileOutputStream fos = new FileOutputStream("serial"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(object1); oos.flush(); oos.close(); } catch(Exception e) { System.out.println("Serialization" + e); System.exit(0); } try { Myclass object2; FileInputStream fis = new FileInputStream("serial"); ObjectInputStream ois = new ObjectInputStream(fis); object2 = (Myclass)ois.readObject(); ois.close(); System.out.println(object2); } catch (Exception e) { System.out.print("deserialization" + e); System.exit(0); } } } class Myclass implements Serializable { String s; int i; double d; Myclass (String s, int i, double d) { this.d = d; this.i = i; this.s = s; } } |
| A. | s=Hello; i=-7; d=2.1E10 |
| B. | Hello; -7; 2.1E10 |
| C. | s; i; 2.1E10 |
| D. | Serialization |
| Answer» B. Hello; -7; 2.1E10 | |
| 1062. |
Which of these is method of ObjectOutput interface used to write the object to input or output stream as required? |
| A. | write() |
| B. | Write() |
| C. | StreamWrite() |
| D. | writeObject() |
| Answer» E. | |
| 1063. |
Which of these is a method of ObjectOutput interface used to finalize the output state so that any buffers are cleared? |
| A. | clear() |
| B. | flush() |
| C. | fflush() |
| D. | close() |
| Answer» C. fflush() | |
| 1064. |
Which of these interface extends DataOutput interface? |
| A. | Serializable |
| B. | Externalization |
| C. | ObjectOutput |
| D. | ObjectInput |
| Answer» D. ObjectInput | |
| 1065. |
Which of these is an interface for control over serialization and deserialization? |
| A. | Serializable |
| B. | Externalization |
| C. | FileFilter |
| D. | ObjectInput |
| Answer» C. FileFilter | |
| 1066. |
Which of these process occur automatically by java runtime system? |
| A. | Serialization |
| B. | Garbage collection |
| C. | File Filtering |
| D. | All of the mentioned |
| Answer» B. Garbage collection | |
| 1067. |
How to read a classpath file? |
| A. | InputStream in =this.getClass().getResource(“SomeTextFile.txt”); |
| B. | InputStream in =this.getClass().getResourceClasspath(“SomeTextFile.txt”); |
| C. | InputStream in =this.getClass().getResourceAsStream(“SomeTextFile.txt”); |
| D. | InputStream in =this.getClass().getResource(“classpath:/SomeTextFile.txt”); |
| Answer» D. InputStream in =this.getClass().getResource(“classpath:/SomeTextFile.txt”); | |
| 1068. |
Which environment variable is used to set java path? |
| A. | JAVA |
| B. | JAVA_HOME |
| C. | CLASSPATH |
| D. | MAVEN_HOME |
| Answer» C. CLASSPATH | |
| 1069. |
How to assign values to variable using property? |
| A. | @Value(“${my.property}”) private String prop; |
| B. | @Property(“${my.property}”) private String prop; |
| C. | @Environment(“${my.property}”) private String prop; |
| D. | @Env(“${my.property}”) private String prop; |
| Answer» B. @Property(“${my.property}”) private String prop; | |
| 1070. |
How to use environment properties in the class? |
| A. | @Environment |
| B. | @Variable |
| C. | @Property |
| D. | @Autowired |
| Answer» E. | |
| 1071. |
What is true about setProperties method? |
| A. | setProperties method changes the set of Java Properties which are persistent |
| B. | Changing the system properties within an application will affect future invocations |
| C. | setProperties method changes the set of Java Properties which are not persistent |
| D. | setProperties writes the values directly into the file which stores all the properties |
| Answer» D. setProperties writes the values directly into the file which stores all the properties | |
| 1072. |
What does System.getProperty(“variable”) return? |
| A. | compilation error |
| B. | value stored in variable |
| C. | runtime error |
| D. | null |
| Answer» E. | |
| 1073. |
Which system property stores installation directory of JRE? |
| A. | user.home |
| B. | java.class.path |
| C. | java.class.path |
| D. | user.dir |
| Answer» D. user.dir | |
| 1074. |
Java system properties can be set at runtime. |
| A. | True |
| B. | false |
| Answer» B. false | |
| 1075. |
Which of the following is true about Java system properties? |
| A. | Java system properties are accessible by any process |
| B. | Java system properties are accessible by processes they are added to |
| C. | Java system properties are retrieved by System.getenv() |
| D. | Java system prooerties are set by System.setenv() |
| Answer» C. Java system properties are retrieved by System.getenv() | |
| 1076. |
Which object Java application uses to create a new process? |
| A. | Process |
| B. | Builder |
| C. | ProcessBuilder |
| D. | CreateBuilder |
| Answer» D. CreateBuilder | |
| 1077. |
What is the output of this program? class newthread implements Runnable { Thread t; newthread() { t = new Thread(this,"My Thread"); t.start(); } public void run() { System.out.println(t); } } class multithreaded_programing { public static void main(String args[]) { new newthread(); } } |
| A. | My Thread |
| B. | Thread[My Thread,5,main]. |
| C. | Compilation Error |
| D. | Runtime Error |
| Answer» C. Compilation Error | |
| 1078. |
What is the output of this program? class newthread implements Runnable { Thread t; newthread() { t = new Thread(this,"My Thread"); t.start(); } public void run() { System.out.println(t.getName()); } } class multithreaded_programing { public static void main(String args[]) { new newthread(); } } |
| A. | My Thread |
| B. | Thread[My Thread,5,main]. |
| C. | Compilation Error |
| D. | Runtime Error |
| Answer» B. Thread[My Thread,5,main]. | |
| 1079. |
What is the output of this program? class newthread implements Runnable { Thread t; newthread() { t = new Thread(this,"My Thread"); t.start(); } } class multithreaded_programing { public static void main(String args[]) { new newthread(); } } |
| A. | My Thread |
| B. | Thread[My Thread,5,main] |
| C. | Compilation Error |
| D. | Runtime Error |
| Answer» D. Runtime Error | |
| 1080. |
What is the output of this program? class newthread implements Runnable { Thread t; newthread() { t = new Thread(this,"New Thread"); t.start(); } public void run() { t.setPriority(Thread.MAX_PRIORITY); System.out.println(t); } } class multithreaded_programing { public static void main(String args[]) { new newthread(); } } |
| A. | Thread[New Thread,0,main]. |
| B. | Thread[New Thread,1,main]. |
| C. | Thread[New Thread,5,main]. |
| D. | Thread[New Thread,10,main]. |
| Answer» E. | |
| 1081. |
What is the output of this program? class newthread implements Runnable { Thread t1,t2; newthread() { t1 = new Thread(this,"Thread_1"); t2 = new Thread(this,"Thread_2"); t1.start(); t2.start(); } public void run() { t2.setPriority(Thread.MAX_PRIORITY); System.out.print(t1.equals(t2)); } } class multithreaded_programing { public static void main(String args[]) { new newthread(); } } |
| A. | true |
| B. | false |
| C. | truetrue |
| D. | falsefalse |
| Answer» E. | |
| 1082. |
Which of these method of Thread class is used to suspend a thread for a period of time? |
| A. | sleep() |
| B. | terminate() |
| C. | suspend() |
| D. | stop() |
| Answer» B. terminate() | |
| 1083. |
Which of these interface is implemented by Thread class? |
| A. | Runnable |
| B. | Connections |
| C. | set |
| D. | MapConnections |
| Answer» B. Connections | |
| 1084. |
Which of these class is used to make a thread? |
| A. | String |
| B. | System |
| C. | Thread |
| D. | Runnable |
| Answer» D. Runnable | |
| 1085. |
Which of interface contains all the methods used for handling thread related operations in Java? |
| A. | Runnable interface |
| B. | Math interface |
| C. | System interface |
| D. | ThreadHandling interface |
| Answer» B. Math interface | |
| 1086. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = b.getClass(); System.out.print(obj.getSuperclass()); } } |
| A. | X |
| B. | Y |
| C. | class X |
| D. | class Y |
| Answer» D. class Y | |
| 1087. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = a.getClass(); System.out.print(obj.getName()); } } |
| A. | X |
| B. | Y |
| C. | a |
| D. | b |
| Answer» B. Y | |
| 1088. |
Which of these methods returns the class of an object? |
| A. | getClass() |
| B. | Class() |
| C. | WhoseClass() |
| D. | WhoseObject() |
| Answer» B. Class() | |
| 1089. |
Which of these classes encapsulate runtime state of an object? |
| A. | Class |
| B. | System |
| C. | Runtime |
| D. | Catche |
| Answer» B. System | |
| 1090. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = b.getClass(); System.out.print(obj.isLocalClass()); } } |
| A. | 0 |
| B. | 1 |
| C. | true |
| D. | False |
| Answer» E. | |
| 1091. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = b.getClass(); System.out.print(obj.isInstance(a)); } } |
| A. | 0 |
| B. | 1 |
| C. | True |
| D. | false |
| Answer» E. | |
| 1092. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = b.getClass(); System.out.print(b.equals(a)); } } |
| A. | 0 |
| B. | 1 |
| C. | true |
| D. | False |
| Answer» E. | |
| 1093. |
What is the output of this program? class X { int a; double b; } class Y extends X { int c; } class Output { public static void main(String args[]) { X a = new X(); Y b = new Y(); Class obj; obj = b.getClass(); System.out.print(obj.getSuperclass()); } } |
| A. | X |
| B. | Y |
| C. | class X |
| D. | class Y |
| Answer» D. class Y | |
| 1094. |
Which of these Exceptions is thrown by loadClass() method of ClassLoader class? |
| A. | IOException |
| B. | SystemException |
| C. | ClassFormatError |
| D. | ClassNotFoundException |
| Answer» E. | |
| 1095. |
Which of these methods return a class object given its name? |
| A. | getClass() |
| B. | findClass() |
| C. | getSystemClass() |
| D. | findSystemClass() |
| Answer» E. | |
| 1096. |
Which of these class defines how the classes are loaded? |
| A. | Class |
| B. | System |
| C. | Runtime |
| D. | ClassLoader |
| Answer» E. | |
| 1097. |
Which of these methods returns the total number of bytes of memory available to the program? |
| A. | getMemory() |
| B. | TotalMemory() |
| C. | SystemMemory() |
| D. | getProcessMemory() |
| Answer» C. SystemMemory() | |
| 1098. |
Which of the following exceptions is thrown by every method of Runtime class? |
| A. | IOException |
| B. | SystemException |
| C. | SecurityException |
| D. | RuntimeException |
| Answer» D. RuntimeException | |
| 1099. |
Which of these classes encapsulate runtime enviroment? |
| A. | Class |
| B. | System |
| C. | Runtime |
| D. | ClassLoader |
| Answer» D. ClassLoader | |
| 1100. |
Will this program generate same output is executed again? class Output { public static void main(String args[]) { int y = double z = Math.random(); System.out.print(y); } } |
| A. | Yes |
| B. | No |
| C. | Compiler Dependent |
| D. | Operating System Dependent |
| Answer» C. Compiler Dependent | |