java - 修复包含计数器的 while 循环

Question

我尝试使用 while 循环向我的程序添加一个计数器，但尚未使其正常工作。有人可以告诉我哪里出错了，我让它工作了一点，但如果我输入正确的值，“错误”文本仍然会出现，它不会跳出循环。

public class Username {
    public static void main (String[]args) {    
        Scanner kb = new Scanner (System.in);
        String [] name = {"barry", "matty", "olly","joey"};
        int j = 0;

        while (j < 3) {
            System.out.println("Enter your name");
            String name1 = kb.nextLine();
            boolean b = true;
            for (int i = 0; i < name.length; i++) {
                if (name[i].equals(name1)) {
                    System.out.println("you are verified you may use the lift");
                    break; // To stop loop checking names
                }
            }
            System.out.println("wrong");
            j++;        
        }
    }
}

Answer 1

外部循环，while，用于允许的尝试。您需要一种额外的方法来指示它中断，因为 break 语句只能从 for 循环中中断。其中一种方法是使用 boolean 指示符:

boolean found = false;
int attempts = 0;
while (!found && attempts < 3) {
    System.out.println("Enter your name");
    String name1 = kb.nextLine();

    for (int i = 0; i < name.length; i++) {
        if (name[i].equals(name1)) {
            System.out.println("you are verified you may use the lift");
            found = true;
            break;// to stop loop checking names
        }
    }
    if (!found) {
        System.out.println("wrong");
    }
    ++attempts;
}