Question

-简介： 您好，我正在编写一个简单的程序来练习。该程序将成为密码生成器。还处于初期阶段。在测试代码时，我遇到了一个问题。我用谷歌搜索，能够找到类似的案例，但是我仍然无法弄清楚。

-问题： 问题出现在同时（规范== 0）之后的几行中。当用户在扫描仪中输入Y或N时，它应该属于“ else if”语句，并在输出屏幕上打印出一个数字，但是它会继续打印“请输入Y或N”。这意味着它会将我的“ else if”语句作为不正确的匹配传递。我该如何解决？

-我尝试过的事情： 我尝试了Nc.toString（）。equals（“ Y”），还尝试了其他人们共享的小代码，但它们根本是错误的或没有用。

-当前输出：

openMenu = (scroll,e) => {
  this.setState(prevState => ({ showMenu: !prevState.showMenu }),
  () => {
    document.addEventListener("click", this.closeMenu);

    /*
    Define a scrollHandler in this closure with "scroll" passed to closeMenu().
    Use this scrollHandler reference for both addEventListener() and subsequent
    removeEventListener() call
    */
    this.scrollHandler = () => this.closeMenu(scroll);

    /*
    Pass scrollHandler as handler for scroll event
    */
    scroll.addEventListener('scroll', this.scrollHandler)
  }
  );
};

closeMenu = (scroll,e) => {
  this.setState({ showMenu: false }, () => {
    document.removeEventListener("click", this.closeMenu);

    /*
    If scrollHandler is defined, remove it as a handler from the element's scroll 
    event, and clear the reference to clean up
    */
    if(this.scrollHandler) {
        scroll.removeEventListener('scroll',this.scrollHandler)
        this.scrollHandler = undefined;
    }
  });
};

-预期输出：

Sys: How long will the Password be? (Numbers only)
User: 5
Sys: Do you want to include Special Characters? (Y/N)
User: Y
Sys: Please type Y or N
Sys: Do you want to include Special Characters? (Y/N)
User: N
Sys: Please type Y or N
Sys: Do you want to include Special Characters? (Y/N)
User: Yes
Sys: Please type Y or N
Sys: Do you want to include Special Characters? (Y/N)
User: 5
Sys: Please type Y or N!
Sys: Do you want to include Special Characters? (Y/N)

-完整代码：

Case 1
    Sys: How long will the Password be? (Numbers only)
    User: 5
    Sys: Do you want to include Special Characters? (Y/N)
    User: Y
    Sys: 1

Case 2
    Sys: Do you want to include Special Characters? (Y/N)
    User: N
    Sys: 2

Case 3
    Sys: Do you want to include Special Characters? (Y/N)
    User: Yes
    Sys: Please type Y or N

Case 4
    Sys: Do you want to include Special Characters? (Y/N)
    User: 5
    Sys: Please type Y or N!
    Sys: Do you want to include Special Characters? (Y/N)

Answer 1

要从扫描仪中读取单词，请使用next（）：

String userInput = Nc.next();
if(userInput.equals("Y")){
    // some code
}

无法从扫描仪的输入中识别出.equals（String）

1 个答案: