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public static void main( String[] args ) {
for ( int i = 0; i < args.length; i++ ) {
if ( ! Character.isDigit(args[i].charAt(0))) {
System.out.println("Not a digit");
} else {
System.out.println("A digit");
}
}
}

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  2. if¿Í else ÆÄÆ®¸¦ ÀüȯÇϽʽÿÀ.

public static void main( String[] args ) {
for ( int i = 0; i < args.length; i++ ) {
if (Character.isDigit(args[i].charAt(0))) {
System.out.println("A digit");
} else {
System.out.println("Not a digit");
}
}
}