Question

问题：使用扫描仪（sc）从用户那里获取输入，如果我没有使用空白sc.nextLine（），则会跳过上一行。如果我使用此空白火，则永远不会收集该变量供以后使用。

System.out.println("Please enter the Airline name: ");
    String airName = sc.nextLine();
    sc.nextLine(); <--------- 
    System.out.println("Please enter the Airline code: ");
    String airCode = sc.nextLine();
    System.out.println("Please enter the Delta Aircraft: ");
    String airCraft = sc.nextLine();
    System.out.println("Please enter the first class seat capacity: ");
    int firstClass = sc.nextInt();
    System.out.println("Please enter the business class seat capacity: ");
    int busiClass = sc.nextInt();
    System.out.println("Please enter the economy class seat capacity: ");
    int econClass = sc.nextInt();
    System.out.println("Airline name: " + airName);
    System.out.println("Airline code: " + airCode);
    System.out.println("Delta Aircraft: " + airCraft);
    //Splitting the first word from the rest of the string
    String arr[] = airCraft.split(" ", 2);
    String firstWord = arr[0];
    System.out.println(firstWord + " first class seat capacity: " + firstClass);
    System.out.println(firstWord + " business class seat capacity: " + busiClass);
    System.out.println(firstWord + " economy class seat capacity: " + econClass);
    //Airline object
    A8AirlineAircraftData airline = new A8AirlineAircraftData(airName, airCode, airCraft, firstClass, busiClass, econClass);
    System.out.println(airName + " successfully added. Press Enter to continue.");
    sc.nextLine();//Press Enter to continue
    sc.nextLine();   
    //A8MainMenu.mainMenu(sc); //return to main menu after Enter. 
    return airline;

我的输出现在：

Airline name: 
Airline code: QA
Delta Aircraft: Boeing 787
Boeing first class seat capacity: 16
Boeing business class seat capacity: 25
Boeing economy class seat capacity: 199
 successfully added. Press Enter to continue.

Answer 1

我最后不得不在之前放置一个空白的sc.nextLine 我开始通过扫描仪。

sc.nextLine(); System.out.println("Please enter the Airline name:"); String airName = sc.nextLine();

空白扫描器nextLine消耗输入，没有它，跳过该行

1 个答案: