Curriculum
Course: Learn Java Programming
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Curriculum

Learn Java Programming

Chapter 0: Computer Language Generations and Environment Setup

0/4

Chapter 1: Introduction to Java

0/6

Chapter 2: Java Data Types, Tokens and Variables

0/5

Chapter 3: Working with User Input in Java

0/6

Chapter 4: Java Operators and Expressions

0/9

Chapter 5: Understanding Control Statements in Java

0/8

Chapter 6: Working with Wrapper Classes Arrays in Java

0/6

Chapter 7: Understanding Classes and Methods in Java Part 1

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Chapter 8: Understanding Constructors and Encapsulation in Java

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Chapter 8: Understanding Methods and Objects in Java Part 2

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Chapter 9: Working with Inheritance and Polymorphism in Java

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Chapter 10: Working with Package, Abstract Class and Interface in Java

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Chapter 11: String Handling in Java

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Chapter 12: Understanding Error and Exception Handling in Java

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Chapter 13: Working with I/O Stream Classes and File Handling in Java

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Chapter 14: Working with Multithreading in Java

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Chapter 15: Working with Generics

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Chapter 16: Working with Collection Frameworks

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Chapter 17: Working with AWT and Swings in Java

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Chapter 18: Event Handling in Java

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Chapter 19: Working with JDBC in Java - Part 1

0/11

Chapter 20: Working with JDBC in Java - Part 2

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Quiz

Data Types and Variables

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  • Questions count: 15
  • Passing grade: A-
  • Time limit: 10 minutes
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1.
Which of these is not a legal identifier in Java?
3DPoint
_myVar
$helloWorld
2.
In Java, which of these is true about implicit type casting?
Implicit casting occurs when converting from a larger to a smaller numeric type.
It is also known as widening conversion.
It may not result in loss of precision.
It needs to be done manually by the programmer.
3.
Which of these is a valid literal for a double data type in Java?
1.0
1e2
Both a and b
4.
What is the default value of a boolean variable in Java?
true
0
false
null
5.
What is the size of a 'char' in Java?
8 bits
16 bits
32 bits
64 bits
6.
What is the range of values for a Java byte data type?
-128 to 127
0 to 255
-32768 to 32767
-2147483648 to 2147483647
7.
Which of the following statements about type conversion is correct in Java?
Byte can be directly converted to char without any explicit casting.
An int can hold all valid byte values without explicit casting.
A double can be automatically converted to float without any data loss.
Casting a double to a float always preserves the precision.
8.
Consider the following Java code snippet: double a = 9.97; int b = (int) a; System.out.println(b);
10
Compilation error
9
9.
Which keyword is used for automatic type conversion in Java?
auto
dynamic
cast
None of the above
10.
Which of these is not a primitive data type in Java?
int
float
String
char
11.
Given the following Java code, what is the result? char c = 'A'; int i = c;
Compilation error
Runtime error
i is 65
i is 'A'
12.
Which suitable data type would you choose to represent a person's age in Java?
byte
short
int
long
13.
Which of these is an implicit type conversion in Java?
int to long
double to int
long to int
char to double
14.
Which of these is an example of explicit type casting in Java?
int a = 100;
double b = a;
int c = (int) b;
float d = 10.5f;
15.
What is the result of type casting a larger value to a smaller data type?
Compilation error
Runtime error
Truncation
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