Java - Command Line Arguments
How can you modify the main method to accept command line arguments and also handle the case when no arguments are passed, printing "No args" in that case?
How can you modify the main method to accept command line arguments and also handle the case when no arguments are passed, printing "No args" in that case?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Check parameter type and null safety
Main method must accept String[] args. args is never null but can be empty.Step 2: Check condition for no arguments
args.length == 0 means no arguments. public static void main(String[] args) { if(args.length == 0) System.out.println("No args"); else System.out.println(args[0]); } correctly checks this and prints "No args".Final Answer:
public static void main(String[] args) { if(args.length == 0) System.out.println("No args"); else System.out.println(args[0]); } -> Option AQuick Check:
Check args.length == 0 for no arguments [OK]
Quick Trick: args array is never null; check length for no args [OK]
Common Mistakes:
- Checking args == null
- Using wrong parameter type
- Checking length < 0 which is impossible
Master "Command Line Arguments" in Java
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