java - Java中控制键盘输入

Question

我要编写这个程序，但不知道如何控制键盘输入:

Write a method to check whether the word entered is valid or not. Valid word should:

1. Have at least 10 characters
2. Start with a letter
3. Contain a letter in upper case
4. Contain at least 3 digits
5. Contain a special character (e.g. @,$.% …etc)
6. Contain a space

Answer 1

您不需要在每次击键时验证它，等到用户输入单词，然后验证。假设您使用控制台输入:

System.out.print("Enter something > ");
Scanner input = new Scanner(System.in);

String inputString = input.nextLine();

//perform validations on inputString, heres the first one:
//regex could be used instead of multiple if statements
if(inputString.length() < 10) {
    System.out.println("Validation failed, word was too short");
}
else if ...