从扫描仪中获取一个字符输入

Question

从扫描仪中获取一个字符输入

javainputcharjava.util.scanner

142

我正在尝试找到一种从键盘输入 char 的方法。

我尝试使用：

Scanner reader = new Scanner(System.in);
char c = reader.nextChar();

这个方法不存在。

我尝试将c作为String。然而，在每种情况下它并不总是起作用，因为我从我的方法中调用的另一个方法需要一个char作为输入。因此，我必须找到一种明确地以字符形式作为输入的方法。

有什么帮助吗？

- Ralph

24个回答

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- HellPreacher · Answer 1

import java.util.Scanner;

public class userInput{
    public static void main(String[] args){
        // Creating your scanner with name kb as for keyBoard
        Scanner kb = new Scanner(System.in);

        String name;
        int age;
        char bloodGroup;
        float height;

        // Accepting Inputs from user
        System.out.println("Enter Your Name");
        name = kb.nextLine(); // for entire line of String including spaces
        System.out.println("Enter Your Age");
        age = kb.nextInt(); // for taking Int
        System.out.println("Enter Your BloodGroup : A/B/O only");
        bloodGroup  = kb.next().charAt(0); // For character at position 0
        System.out.println("Enter Your Height in Meters");
        height = kb.nextFloat(); // for taking Float value

        // closing your scanner object
        kb.close();

        // Outputting All
        System.out.println("Name : " +name);
        System.out.println("Age : " +age);
        System.out.println("BloodGroup : " +bloodGroup);
        System.out.println("Height : " +height+" m");

    }
}

- John Born · Answer 2

// Use a BufferedReader to read characters from the console.
import java.io.*;
class BRRead {
public static void main(String args[]) throws IOException
{
char c;
BufferedReader br = new
BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter characters, 'q' to quit.");
// read characters
do {
c = (char) br.read();
System.out.println(c);
} while(c != 'q');
}
}

- Harshal Mande · Answer 3

试一下这个： char c=S.nextLine().charAt(0)；

- Abdo Bmz · Answer 4

你应该使用scanner.next()获取字符串，并在返回的字符串上调用String.charAt(0)方法。
例子：

    import java.util.Scanner;

    public class InputC{


            public static void main(String[] args) {
                // TODO Auto-generated method stub
                   // Declare the object and initialize with
                   // predefined standard input object
                    Scanner scanner = new Scanner(System.in);
                    System.out.println("Enter a character: ");
                    // Character input
                    char c = scanner.next().charAt(0);
                    // Print the read value
                    System.out.println("You have entered: "+c);
            }


        }

输出

Enter a character: 
a
You have entered: a

- Kalhara Tennakoon · Answer 5

请尝试以下方法。

Scanner reader = new Scanner(System.in);
char c = reader.next().charAt(0);

这将从键盘获取一个字符。

- bilal Tashfeen · Answer 6

你只需要编写这个代码以获取 char 类型的值。

char c = reader.next().charAt(0);

- vishu · Answer 7

import java.io.*;

class abc // enter class name (here abc is class name)
{
    public static void main(String arg[])
    throws IOException // can also use Exception
    {
        BufferedReader z =
            new BufferedReader(new InputStreamReader(System.in));

        char ch = (char) z.read();
    } // PSVM
} // class

- Arafe Zawad Sajid · Answer 8

Scanner key = new Scanner(System.in);
//shortcut way 
char firstChar=key.next().charAt(0);  
//how it works;
/*key.next() takes a String as input then,
charAt method is applied on that input (String)
with a parameter of type int (position) that you give to get      
that char at that position.
You can simply read it out as: 
the char at position/index 0 from the input String
(through the Scanner object key) is stored in var. firstChar (type char) */

//you can also do it in a bit elabortive manner to understand how it exactly works
String input=key.next();  // you can also write key.nextLine to take a String with spaces also
char firstChar=input.charAt(0);
char charAtAnyPos= input.charAt(pos);  // in pos you enter that index from where you want to get the char from

顺便提一下，您不能直接将char作为输入。如上所述，首先需要取一个String，然后找到并存储charAt(0)。

- Steve · Answer 9

从用户输入中读取字符的简单解决方案。先读取一个字符串，然后使用String的charAt(0)方法。

Scanner reader = new Scanner(System.in);
String str = reader.next();
char c = str.charAt(0);

就是这样。

- Farhan · Answer 10

试试这个

Scanner scanner=new Scanner(System.in);
String s=scanner.next();
char c=s.charAt(0);