Values and Data types I FiniteQuest

Values and Data types I

Primitive Data Types, Type Conversion and Casting, Wrapper Classes, String Data Type

1 / 10

Which of the following statements about primitive data types is correct?

All primitive types in Java are signed.

char is considered a numeric data type because it holds Unicode values.

The default value of a boolean is true.

float is more precise than double.

2 / 10

Which of the following correctly demonstrates the range of the int data type in Java?

-2³¹ to 2³¹ – 1

-2¹⁵ to 2¹⁵ – 1

-2³² to 2³² – 1

-2⁶⁴ to 2⁶⁴ – 1

3 / 10

What will happen when the following code is executed?

byte b = 127;

b = (byte)(b + 1);

System.out.println(b);

128

127

-128

Compilation Error

4 / 10

What will the following code output?

int a = 10;
double b = 20.5;
double result = a + b;
System.out.println(result);

30.5

Compilation Error

Runtime Error

5 / 10

Which of the following is true about typecasting in Java?

Implicit casting is always required when assigning double to int.

Explicit casting can lead to data loss.

Casting from boolean to int is allowed.

Implicit casting is not possible between primitive types.

6 / 10

What will the following code produce?

double x = 99.99;
int y = (int)x;
System.out.println(y);

100

99.99

Compilation Error

7 / 10

Which of the following is NOT true about wrapper classes in Java?

Wrapper classes allow primitive types to be used as objects.

Integer and Double are immutable wrapper classes.

Auto-boxing converts wrapper objects to primitive types automatically.

The parseInt method in the Integer class converts a String to an int.

8 / 10

What will the following code output?

Integer x = 10;
Integer y = 10;
System.out.println(x == y);

true

false

Compilation Error

Runtime Error

9 / 10

What is the output of the following code?

String s1 = “Java”;
String s2 = new String(“Java”);
System.out.println(s1 == s2);

true

false

Compilation Error

Runtime Error

10 / 10

Which of the following statements about strings is true?

Strings in Java are mutable.

The StringBuilder class is immutable.

Strings are compared using the compareTo() method for lexicographic comparison.

Strings cannot contain whitespace characters.

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