您的程序不必返回
intin
public static intmain。相反，您可以将其作为
void（表示不返回任何内容）。您应该只打印您的声明，而不要打印
return它们。也
int[]应该
String[]并且
Scanner应该检查
nextInt()注释中指出的内容！
import java.util.InputMismatchException;import java.util.Scanner; // This will import just the Scanner class.public class GuessAge {public static void main(String[] args) { System.out.println("nWhat is David's Age?"); Scanner userInputScanner = new Scanner(System.in); int age = userInputScanner.nextInt(); int validInput = 20; // typo in your pre - compare to age if (validInput == age) { System.out.println("Correct!!"); } else { System.out.println("Wrong...."); }}}
