Java、Eclipse。如何让扫描仪同时读取小写和大写？

Question

首先我想说你们很棒。我从你们所有人身上学到了很多东西。我的问题是如何让我的扫描仪读取用户的大写和小写输入？我的代码如下。

Scanner anotherScanner = new Scanner(System.in);
boolean usersSelection = false;
String c;
while (!usersSelection) {
    System.out.println("Selection: ");
    if (anotherScanner.hasNext("q")) {
        c = anotherScanner.next();
        usersSelection = true;
        System.out.println("you have selected to quit");
    }
    if (anotherScanner.hasNext("t")) {
        c = anotherScanner.next();
        usersSelection = true;
        System.out.println("you have selected the coin toss estimator");
    }
    if (anotherScanner.hasNext("g")) {
        c = anotherScanner.next();
        usersSelection = true;
        System.out.println("you have selected the grade estimator");
    }
    if (anotherScanner.hasNext("c")) {
        c = anotherScanner.next();
        usersSelection = true;
        System.out.print("You have selected color Challenge");
    } else {
        String zoom = anotherScanner.next();
        System.out.println("You have entered an invalid option. '"
            + zoom + "' is not a valid option.");
    }
}

我想根据用户的选择(不区分大小写)进行操作，即用户输入“Q”还是“q”。

Answer 1

扫描仪支持正则表达式，因此您可以使用诸如 anotherScanner.hasNext("q|Q") 之类的内容