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Core Java & Concepts
Free
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1. Is Java Platform Independent if then how ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
Java is platform-independent because it is compiled to a bytecode that can be run on any device that has a Java Virtual Machine (JVM).
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2. How many types of packages are there in Java ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
User-defined packages.
Other defined packages.
None of these
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3. What is JVM ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
JVM is a virtual machine that enables the execution of Java bytecode. The JVM acts as an interpreter between the Java programming language and the underlying hardware
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4. What is JIT ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
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5. Which component is used to compile, debug and execute the java programs ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
JRE
JIT
JDK
JVM
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6. Which one of the following is not a Java feature?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
Object-oriented
Use of pointers
Portable
Dynamic and Extensible
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7. Which of the following is a type of polymorphism in Java Programming ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
Multiple polymorphism
Compile time polymorphism
Multilevel polymorphism
Execution time polymorphism
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8. What will be the output of the following Java program ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
0 256
0 64
256 0
64 0
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9. What is the extension of compiled java classes ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
.txt
.js
.class
.java
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10. Which exception is thrown when java is out of memory ?
Hints :
javac compiler compiles the program to form a bytecode or .class file
Explanation :
The bytecode can be created on any System and can be executed in any other system despite hardware or software
Memory Error
Out of Memory Error
Memory Out of Bounds Exception
Memory Full Exception
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Exam Info
Total Marks
:
100
Possitive Mark
:
10
( Per Question )
Negative Mark
:
15
( Per Question )
Technical Issues
For any technical queries/difficulties, immediately mail with proper screen shot and student’s details to the mail
info@elysiumacademy.org
Exam Hints
javac compiler compiles the program to form a bytecode or .class file.
Exam Explanation
The bytecode can be created on any System and can be executed in any other system despite hardware or software.
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