Java Programming Quiz

Which of these is not a Java keyword?

• static

• volatile

• unsigned

• native

What is the default value of Boolean in Java?

• 0

• null

• false

• true

How many times will this loop run? for (int i = 0; i < 10; i++) { if (i == 5) break; }

• 10

• 5

• 4

• Infinite

What's the output of: int[] arr = new int[5]; System.out.println(arr[2]);

• Error

• Garbage

• 0

• null

Which method can return multiple values?

• void

• int[]

• boolean

• char

What is immutable in Java?

• StringBuffer

• StringBuilder

• String

• char[]

What is true about constructors?

• Return type required

• Called manually

• No return type

• Must be static

Which of these is not a wrapper class?

• Integer

• Boolean

• Double

• Char

Which is correct regarding interfaces?

• Interface can have constructors

• Abstract class must have abstract method

• Interface can have default methods

• Interface cannot be implemented

Which block is always executed?

• catch

• finally

• try

• throw