在java中调用两个不同方法的相同输入

我正在尝试用java为KWIC实现main方法。我遇到的问题是，我必须询问用户是否希望从控制台/文件写入输入，并将输出写入控制台/文件。当我必须阅读时，第一次向用户请求控制台/文件可以正常工作，但当我再次向他们请求输出时，我相信它会回到第一个If条件。这是代码供参考

try {

        System.out.println("Please enter FILE to input from file or CONSOLE to input from console:");
        String userInput = "";
        while ((userInput = scannerWrapper.nextLine()) != "-1") {

            if (userInput.equals("CONSOLE")) {

                System.out.println("Please enter FILE to output from file or CONSOLE to output from console:");
                List<String> cshiftConsole = circularShifter.shiftLines(inputFromConsole.read());

                if (userInput.equals("CONSOLE")) {

                    System.out.println("Please enter lines to add, then enter -1 to finish:");

                    // Console

                    cshiftConsole = alphabetizer.sort(cshiftConsole);
                    outputToConsole.write(cshiftConsole);

                    for (String element : cshiftConsole) {
                        System.out.println(element);
                    }
                }

            }

        }
    } catch (Exception e) {
        e.printStackTrace();
    }

---

在第二次

CONSOLE（userInput）

之后，应该要求我输入行，但是这将

CONSOLE

作为我想要循环移位的输入。任何帮助都将非常感谢。

您的代码中有一些问题，如果我理解正确，您希望决定从何处输入，从何处输出，并将两个

字符串

放入

列表

（userInput=scannerWrapper.nextLine（））！=“-1”

您可以使用

.equals（…）

比较Java中的字符串，就像您在下面的代码中所做的那样

每次你问用户想从哪里输入时，你只需要读一次，所以不要把它放在

中，而要在
if
上做

在每次迭代中创建列表，将其作为实例成员

在每次打印对象的迭代中，等待用户首先停止添加项目（他们键入

-1

）

更好的方法可以是这样：

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class InputCycle {
    private Scanner scanner;
    private static final String CONSOLE = "CONSOLE";
    private static final String EXIT_CODE = "-1";
    private List<String> list;
    
    public static void main(String[] args) {
        new InputCycle().readAndWrite();
    }
    
    private void readAndWrite() {
        scanner = new Scanner(System.in);
        list = new ArrayList<String>();
        
        System.out.println("INPUT FROM CONSOLE / FILE");
        String input = scanner.nextLine(); // Read where to input from
        
        if (input.equals(CONSOLE)) { 
            System.out.println("OUTPUT TO CONSOLE / FILE");
            
            String output = scanner.nextLine(); // Read where to output to
            
            if (output.equals(CONSOLE)) {
                System.out.println("WRITE LINES (" + EXIT_CODE + " TO EXIT)");
                String line = "";
                do {
                    line = scanner.nextLine(); // Read every line
                    if (!line.equals(EXIT_CODE)) {
                        list.add(line);
                    }
                } while (!line.equals(EXIT_CODE));
            } else { // Write to a file with your own code
                System.out.println("Writing to a file");
            }
        } else { //Read from a file
            System.out.println("Reading from a file");
        }
        
        System.out.println("ALL LINES: ");
        
        list.forEach(line -> System.out.println(line)); //Print all the lines user wrote
    }
}

---

请回答您的问题并将代码转换为a好吗？谢谢您使用扫描仪的nextLine（）创建第二个字符串变量，这是我无法想到的。很高兴能提供帮助

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class InputCycle {
    private Scanner scanner;
    private static final String CONSOLE = "CONSOLE";
    private static final String EXIT_CODE = "-1";
    private List<String> list;
    
    public static void main(String[] args) {
        new InputCycle().readAndWrite();
    }
    
    private void readAndWrite() {
        scanner = new Scanner(System.in);
        list = new ArrayList<String>();
        
        System.out.println("INPUT FROM CONSOLE / FILE");
        String input = scanner.nextLine(); // Read where to input from
        
        if (input.equals(CONSOLE)) { 
            System.out.println("OUTPUT TO CONSOLE / FILE");
            
            String output = scanner.nextLine(); // Read where to output to
            
            if (output.equals(CONSOLE)) {
                System.out.println("WRITE LINES (" + EXIT_CODE + " TO EXIT)");
                String line = "";
                do {
                    line = scanner.nextLine(); // Read every line
                    if (!line.equals(EXIT_CODE)) {
                        list.add(line);
                    }
                } while (!line.equals(EXIT_CODE));
            } else { // Write to a file with your own code
                System.out.println("Writing to a file");
            }
        } else { //Read from a file
            System.out.println("Reading from a file");
        }
        
        System.out.println("ALL LINES: ");
        
        list.forEach(line -> System.out.println(line)); //Print all the lines user wrote
    }
}

INPUT FROM CONSOLE / FILE
CONSOLE
OUTPUT TO CONSOLE / FILE
CONSOLE
WRITE LINES (-1 TO EXIT)
FOO
BAR
BANANA
-1
ALL LINES: 
FOO
BAR
BANANA