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What are valid identifiers in Java?
A valid identifier in java –
- Must begin with a letter (A to Z or a to z), currency character ($) or an underscore (_).
- Can have any combination of characters after the first character.
- Cannot be a keyword.
Example
Following example shows various possible identifiers used to declare a variable in Java.
public class VariableTest {
public static void main(String args[]) {
// Declaring a variable named num
int num = 1;
int _num = 10;
int $num = 100;
int num123 = 1000;
int NUM = 10000;
//Printing the value of the variable num
System.out.println("value if the variable num: "+num);
System.out.println("value if the variable _num: "+_num);
System.out.println("value if the variable $num: "+$num);
System.out.println("value if the variable num123: "+num123);
System.out.println("value if the variable NUM: "+NUM);
}
}
Output
value if the variable num: 1 value if the variable _num: 10 value if the variable $num: 100 value if the variable num123: 1000 value if the variable NUM: 10000
Updated on: 30-Jul-2019
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