Java Basics

Variables

100

Name the 8 primitive data types

byte, short, int, long, double, float, boolean, String

200

What is a variable?

Used to store values in Java

300

Name two rules for naming variables in Java

Case sensitive, camel case, can only start with $, _, 

400

Write a code fragment to assign a value of 4 to an integer named hello.

int hello = 4;

500

Is String a primitive type?

NOOO

Conditional Statements

100

Name two types of conditional statements

if-else if-else and switch

200

What are the conditional operators?

==, >=, <=, <, >, ==, !=, ||, &&, !

300

What is the symbol for not equal to

!=

400

Write a code fragment checking if a variable a is greater than 2, if it is print true, if not print false.

if(a>2){

System.out.println("true");

}

else{

System.out.println("false");

}

500

What does the following code fragment output?

int x = 1;

if(x<3){

return true;}

else if(x<2){

return false;}

else{

return true;}

true

Scanner

100

What is the scanner class used for?

Reading information from the user

200

What is an import

used to import code that others have written, reuse code

300

What is the import statement for Scanner

import java.util.Scanner;

400

Initialize a Scanner called inp;

Scanner inp = new Scanner(System.in);

500

Read in an integer from the user

int a = inp.nextInt();

Loops

100

Name two types of loops

While loop, for loop

200

Is for loop a definite loop?

yes

300

Is while loop a definite loop?

No

400

Write a for loop looping through 1 through 10 and printing it

for( int i = 1; i<11; i++){

System.out.println(i);

}

500

Write an infinite loop with a while loop

int i = 1;

while(i==1){

}

Miscellaneous

100

Definition of platform independence

Works on all platforms

200

full form of JVM, JDK

Java Virtual Machine, Java Development Kit

300

What does Java have that is unique in turning source code to machine language

JVM to compile byte code

400

What edition is Java on?

8

500

Who invented Java

James Gosling