Document Text Contents
Page 2
Core java NAGOOR BABU
2
DURGA SOFT
Example:
class Test{
int number=10;
int Number=20;
int NUMBER=20; we can differentiate with case.
int NuMbEr=30;
}
Rule 5: There is no length limit for java identifiers but it is not recommended to take more than
15 lengths.
Rule 6: We can’t use reserved words as identifiers.
Example: int if=10; --------------invalid
Rule 7: All predefined java class names and interface names we use as identifiers.
Example 1:
class Test
{
public static void main(String[] args){
int String=10;
System.out.println(String);
}}
Output:
10
Example 2:
class Test
{
public static void main(String[] args){
int Runnable=10;
System.out.println(Runnable);
}}
Output:
10
Even though it is legal to use class names and interface names as identifiers but it is not a good
programming practice.
Which of the following are valid java identifiers?
Core java NAGOOR BABU
2
DURGA SOFT
Example:
class Test{
int number=10;
int Number=20;
int NUMBER=20; we can differentiate with case.
int NuMbEr=30;
}
Rule 5: There is no length limit for java identifiers but it is not recommended to take more than
15 lengths.
Rule 6: We can’t use reserved words as identifiers.
Example: int if=10; --------------invalid
Rule 7: All predefined java class names and interface names we use as identifiers.
Example 1:
class Test
{
public static void main(String[] args){
int String=10;
System.out.println(String);
}}
Output:
10
Example 2:
class Test
{
public static void main(String[] args){
int Runnable=10;
System.out.println(Runnable);
}}
Output:
10
Even though it is legal to use class names and interface names as identifiers but it is not a good
programming practice.
Which of the following are valid java identifiers?
