java - 使用 nextLine() 字符串 java 空字符

Question

    System.out.println("-----------------------------------------------------------");
    System.out.println("Please select a task");
    System.out.println("1: List employees with details");
    System.out.println("2: List of clients in state");
    System.out.println("3: List portfolio of client");
    System.out.println("4: Release an employee");
    System.out.println("5 Display stocks available for purchase/selling");
    System.out.println("6: Display client details");
    System.out.println("7: Buy Stock for client ");
    System.out.println("0: Exit program");
    System.out.println("-----------------------------------------------------------" + "\n" + "\n");

    System.out.print("Input:");

    Scanner scan = new Scanner(System.in);

    input = scan.nextInt();

    if (input == 1)
        {
        System.out.println("length of array list: " + employeeList.size());

        int index = 0;
        while ( index < employeeList.size() )
            {
            System.out.println(employeeList.get(index));
            index++;
            }
        }
    else if (input == 2)
        {
        String state_choice;
        System.out.println("Please enter the abbrivation for the state:");
        state_choice = scan.nextLine();

这是我当前代码的一部分，当我尝试运行时，我在 [else if (input == 2)] 处遇到问题，它不允许我输入，实际上只是忽略它。我认为这是因为上一个条目中的“\n”。有没有办法删除“\n”或多余的字符，而无需在我的条目之前放置另一个 scan.nextLine() ？在java文档中没有真正看到任何内容..

Answer 1

只需在 input = scan.nextInt(); 之后添加 scan.nextLine(); 即可。问题出在 input = scan.nextInt(); 中，它只读取整数，因此您需要 scan.nextLine(); 丢弃新行 \n 按 Enter 键生成。