Basic Java

Question 1

determination of the main program

Answer 1

public static void main(String[] args){

}

Question 2

end of line comments

Answer 2

//

Question 3

comment field

Answer 3

/* comment */

Question 4

2 numbers each side of the decimal

Answer 4

double

Question 5

string type

Answer 5

String

Question 6

+ + variable;

- variable;

Answer 6

variable = variable + 1;
variable = variable - 1;

Question 7

printing operation

Answer 7

System.out.println();

Question 8

to print a quotation mark

Answer 8

"

Question 9

A Java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes.

Answer 9

abstract

Question 10

A Java keyword used to resume program execution at the statement immediately following the current statement. If followed by a label, the program resumes execution at the labeled statement.

Answer 10

break

Question 11

A Java keyword that defines a group of statements to begin executing if a value specified matches the value defined by a preceding switch keyword.

Answer 11

case

Question 12

A Java keyword used to declare a block of statements to be executed in the event that a Java exception, or run time error, occurs in a preceding try block.

Answer 12

catch

Question 13

A Java keyword used to declare a a single 16-bit Unicode character variable.

Answer 13

char

Question 14

A Java keyword used to resume program execution at the end of the current loop. If followed by a label, it resumes execution where the label occurs.

Answer 14

continue

Question 15

A Java keyword optionally used after all case conditions in a switch statement. If all case conditions are not matched by the value of the switch variable, this keyword will be executed.

Answer 15

default

Question 16

A Java keyword used to declare a loop that will iterate a block of statements. The loop’s exit condition can be specified with the while keyword.

Answer 16

do

Question 17

A Java keyword used to define a a double-precision 64-bit IEEE 754 floating point variable.

Answer 17

double

For decimal values, this data type is generally the default choice.

Question 18

A Java keyword used to execute a block of statements in the case that the test condition with the if keyword evaluates to false.

Answer 18

else

Question 19

A Java keyword used to declare an enumerated type, whose legal values consist of a fixed set of constants.

Answer 19

enum

Question 20

A Java keyword used to define an entity once and cannot change it or derive from it later.

Answer 20

final

A class with this keyword cannot be subclassed, a method with this keyword cannot be overridden and a variable with this keyword cannot change from its initialized value.

Question 21

A Java keyword that executes a block of statements regardless of whether a Java Exception, or run time error, occurred in a block defined previously by the try keyword.

Answer 21

finally

Question 22

A Java keyword used to define a a single-precision 32-bit IEEE 754 floating point number variable.

Answer 22

float

Question 23

A Java keyword used to declare a loop that reiterates statements. The programmer can specify the statements to be executed, exit conditions, and initialization variables for the loop.

Answer 23

for

Question 24

A Java keyword used to conduct a conditional test and execute a block of statements if the test evaluates to true.

Answer 24

if

Question 25

A Java keyword included in the class declaration to specify any interfaces that are used by the current class.

Answer 25

implements

Question 26

A Java keyword used at the beginning of a source file that can specify classes or entire packages to be referred to later without including their package names in the reference.

Answer 26

import

Question 27

A Java keyword used to define a 32-bit signed two’s complement integer variable.

Answer 27

int

For integral values, this data type is generally the default choice unless there is a reason to choose something else.

Question 28

A Java keyword used to define a collection of method definitions and constant values. It can be implemented by other classes with the “implements” keyword.

Answer 28

interface

Question 29

A Java keyword used to define a 64-bit signed two’s complement integer variable.

Answer 29

long

Question 30

A Java keyword that is used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another programming language.

Answer 30

native

Question 31

A Java keyword used to create an instance of a class.

Answer 31

new

Question 32

A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by other elements of its class

Answer 32

private

Question 33

A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by elements residing in its class, subclasses, or classes in the same package.

Answer 33

protected

Question 34

A Java keyword used in a method or variable declaration. It signifies that the method or variable can be accessed by elements residing in other classes.

Answer 34

public

Question 35

A Java keyword that causes the code to exit from the current method, and the control flow returns to where the method was invoked.

Answer 35

return

It has two forms: one that returns a value, and one that doesn’t.

Question 36

A Java keyword used to define a 16-bit signed two’s complement integer variable.

Answer 36

short

Question 37

A Java keyword used to define a variable as a class variable. Classes maintain one copy of class variables regardless of how many instances exist of that class.

Answer 37

static

This keyword can also be used to define a method as a class method. Class methods are invoked by the class instead of a specific instance, and can only operate on class variables.

Question 38

A Java keyword used to access members of a class inherited by the class in which it appears.

Answer 38

super

Question 39

A Java keyword used to evaluate a variable that can later be matched with a value specified by the case keyword in order to execute a group of statements.

Answer 39

switch

Question 40

A keyword in the Java programming language that, when applied to a method or code block, guarantees that at most one thread at a time executes that code.

Answer 40

synchronized

Question 41

A Java keyword that can be used to represent an instance of the class in which it appears. It can be used to access class variables and methods.

Answer 41

this

Question 42

A Java keyword that enables the programmer to _____ an exception at that point in the code. The exception will be caught by the nearest try-catch clause that can catch that type of exception.

Answer 42

throw

Question 43

A Java keyword used in method declarations that specify which exceptions are not handled within the method but rather passed to the next higher level of the program.

Answer 43

throws

Question 44

A keyword in the Java programming language that indicates that a field is not part of the serialized form of an object.

Answer 44

transient

Question 45

A Java keyword that defines a block of statements that may throw a Java language exception. If an exception is thrown, an optional catch block can handle specific exceptions thrown within that block. Also, an optional finally block will be executed regardless of whether an exception is thrown or not.

Answer 45

try

Question 46

A Java keyword used in method declarations to specify that the method does not return any value. It can also be used as a nonfunctional statement.

Answer 46

void

Question 47

A Java keyword used in variable declarations that specifies that the variable is modified asynchronously by concurrently running threads.

Answer 47

volatile

Question 48

A Java keyword used to declare a loop that iterates a block of statements. The loop’s exit condition is specified as part of this statement.

Answer 48

while