Java Keywords

Question 1

abstract

Answer 1

Java abstract keyword is used to declare abstract class. Abstract class can provide the implementation of interface. It can have abstract and non-abstract methods.

Question 2

boolean

Answer 2

Java boolean keyword is used to declare a variable as a boolean type. It can hold True and False values only.

Question 3

break

Answer 3

Java break keyword is used to break loop or switch statement. It breaks the current flow of the program at specified condition.

Question 4

byte

Answer 4

Java byte keyword is used to declare a variable that can hold an 8-bit data values.

Question 5

case

Answer 5

Java case keyword is used to with the switch statements to mark blocks of text.

Question 6

catch

Answer 6

Java catch keyword is used to catch the exceptions generated by try statements. It must be used after the try block only.

Question 7

char

Answer 7

Java char keyword is used to declare a variable that can hold unsigned 16-bit Unicode characters

Question 8

class

Answer 8

Java class keyword is used to declare a class.

Question 9

continue

Answer 9

Java continue keyword is used to continue the loop. It continues the current flow of the program and skips the remaining code at the specified condition.

Question 10

default

Answer 10

Java default keyword is used to specify the default block of code in a switch statement.

Question 11

do

Answer 11

Java do keyword is used in control statement to declare a loop. It can iterate a part of the program several times.

Question 12

double

Answer 12

Java double keyword is used to declare a variable that can hold a 64-bit floating-point numbers.

Question 13

else

Answer 13

Java else keyword is used to indicate the alternative branches in an if statement.

Question 14

enum

Answer 14

Java enum keyword is used to define a fixed set of constants. Enum constructors are always private or default.

Question 15

extends

Answer 15

Java extends keyword is used to indicate that a class is derived from another class or interface.

Question 16

final

Answer 16

Java final keyword is used to indicate that a variable holds a constant value. It is applied with a variable. It is used to restrict the user.

Question 17

finally

Answer 17

Java finally keyword indicates a block of code in a try-catch structure. This block is always executed whether exception is handled or not.

Question 18

float

Answer 18

Java float keyword is used to declare a variable that can hold a 32-bit floating-point number.

Question 19

for

Answer 19

Java for keyword is used to start a for loop. It is used to execute a set of instructions/functions repeatedly when some conditions become true. If the number of iteration is fixed, it is recommended to use for loop.

Question 20

if

Answer 20

Java if keyword tests the condition. It executes the if block if condition is true.

Question 21

implements

Answer 21

Java implements keyword is used to implement an interface.

Question 22

imports

Answer 22

Java import keyword makes classes and interfaces available and accessible to the current source code.

Question 23

instanceof

Answer 23

Java instanceof keyword is used to test whether the object is an instance of the specified class or implements an interface.

Question 24

int

Answer 24

Java int keyword is used to declare a variable that can hold a 32-bit signed integer.

Question 25

interface

Answer 25

Java interface keyword is used to declare an interface. It can have only abstract methods.

Question 26

long

Answer 26

Java long keyword is used to declare a variable that can hold a 64-bit integer.

Question 27

native

Answer 27

Java native keyword is used to specify that a method is implemented in native code using JNI (Java Native Interface).

Question 28

new

Answer 28

Java new keyword is used to create new objects.

Question 29

null

Answer 29

Java null keyword is used to indicate that a reference does not refer to anything. It removes the garbage value.

Question 30

package

Answer 30

Java package keyword is used to declare a Java package that includes the classes.