Java, part I

Who invented Java?

• Ryan Gosling

• Bjarne Stroustrup

• James Gosling

• Guido van Rossum

Is String a primitive data type?

• Yes

• No

• Both

Which method to use to find length of a string?

• length()

• size()

• long()

• count()

String x = "10";

String y = "20";

String z = x + y;

System.out.println(z);

Guess the output.

• 1020

• 10 20

• 30

• "10 20"

Choose most appropriate purpose of trim() method in String?

• to remove white spaces

• to get a substring of the string

• to cut String at desired index

• to remove extra white spaces from start and end of String

What is the most appropriate way to check if two Strings are identical?

• string1 == string2

• string1.equals(string2)

• string1.same(string2)

• string1.equalsIgnorecase(string2)

int[] myArray = {11, 22, 33, 44, 55};

which code is correct to print length of above int-array?

• System.out.println(int[].myArray.length());

• System.out.println(myArray.length);

• System.out.println(myArray.length());

• System.out.println(int[].myArray.size());

Java was originally named:

• Coffee

• Oak

• New C++

• Duke

What is the output?

int array[][] ={{9001, 2000, 1243), {77, 88, 99, 111}};

System.out.println(array[1][3]);

• 1243

• 99

• 111

• Index out of bounds error

Multiple inheritance allows a class to inherit characteristics and features from more than one abstract parent class. This allows a subclass to extend more than one superclass, in order to use the methods of each. Java supports multiple inheritance.

• True

• False