扫描仪方法打开和关闭两次

  • Z时代
  • 2024-01-10
  • 分类：问答

在一个类中，我有两种使用扫描器类的不同方法。我为第一个方法创建了一个扫描程序对象的新实例，然后在第一个方法的结尾将其关闭…然后在第二个方法中创建了一个对象（具有不同名称）的新实例，最后在此方法的结尾。

除非我打开扫描仪一次，然后关闭扫描仪，否则它将无法工作并返回错误。扫描器类的双重用途似乎不起作用。我究竟做错了什么？

这是我的两种返回错误的方法…

public void GameSetup(){
    //intro to the program and what the user should expect to do
    Scanner in = new Scanner(System.in);
    out.println("Let's play a little baseball game. Type down the scores for each team at the end of each inning to determine the winner!" +
            "\nFor each inning enter the score for the first team, hit space and enter the score for the second team.\nFirst, let's enter the team names:");
    //Console will ask for the team names.
    out.println("What is the name of team 1?");
    team1Name = in.nextLine(); //Read team name 1
    out.println("What is the name of team 2?");
    team2Name = in.nextLine(); //Read team name 2
    in.close();//close the scanner
}
public void GetScores() {//this method will make the console ask for the scores for each innings
    Scanner input = new Scanner(System.in);
    out.println("What is the score at the end of 1st inning? (team 1 score <space> team 2 score)"); //The console asks to enter scores for each team
    team1Array[0] = input.nextInt(); //Read an integer for team 1 inning 1
    team2Array[0] = input.nextInt(); //Read an integer for team 2 inning 1
    out.println("What is the score at the end of 2nd inning? (team 1 score <space> team 2 score)"); 
    input.close();
}

回答：

您应该将Scanner声明为类变量，因为您已经在gameSetup（）方法中关闭了扫描仪。例：

 public class Game{
        Scanner in = new Scanner(System.in);
        public void GameSetup(){
            //insert code here DO NOT CLOSE SCANNER....
        }
        public void GetScores() {
            //your code here.........
            in.close();
        }
 }

否则，您可以做的是在每个方法中声明一个扫描器并关闭作用域。

以上是 扫描仪方法打开和关闭两次 的全部内容， 来源链接： utcz.com/qa/401587.html

回到顶部