如何在java中进行字符输入

Question

在 C 语言中，我们可以使用键盘上的关键字 char 将输入作为字符

scanf("%c", &ch);

但是在 Java 中如何做到这一点？

我试过这个：

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter a character: ");
    char c = scanner.next().charAt(0);
    System.out.println("You have entered: "+c);
  }
}

Answer 1

您可以使用扫描仪从输入中读取：

Scanner scanner = new Scanner(System.in); 
char c = scanner.next().charAt(0); //charAt() method returns the character at the specified index in a string. The index of the first character is 0, the second character is 1, and so on.

Answer 2

您可以简单地使用(char) System.in.read(); 转换为char 来将int 转换为char

Answer 3

import java.util.Scanner;

class SwiCas {

    public static void main(String as[]) {   
        Scanner s= new Scanner(System.in);

        char a=s.next().charAt(0);//this line shows how to take character input in java

        switch(a) {    
            case 'a':
                System.out.println("Vowel....");   
                break;    
            case 'e':
                System.out.println("Vowel....");   
                break;   
            case 'i':
                System.out.println("Vowel....");   
                break;
            case 'o':
                System.out.println("Vowel....");    
                break;    
            case 'u':
                System.out.println("Vowel....");   
                break;    
            case 'A':
                System.out.println("Vowel....");    
                break;    
            case 'E':
                System.out.println("Vowel....");  
                break;    
            case 'I':
                System.out.println("Vowel....");    
                break;    
            case 'O':
                System.out.println("Vowel....");    
                break;   
            case 'U':
                System.out.println("Vowel....");    
                break;    
            default:    
                System.out.println("Consonants....");
        }
    }
}

Answer 4

使用系统类

char yourChar = System.in.read()

Answer 5

这里是示例程序。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ReadFromConsole {

  public static void main(String[] args) {

    System.out.println("Enter here : ");

    try{
        BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in));

        String value = bufferRead.readLine();

        System.out.println(value);
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }
  }
}

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Answer 6

使用 java 你可以做到这一点：

使用扫描仪：

Scanner reader = new Scanner(System.in);
String line = reader.nextLine();
// now you can use some converter to change the String value to the value you need.
// for example Long.parseLong(line) or Integer.parseInt(line) or other type cast

使用 BufferedReader：

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String line = reader.readLine();
// now you can use some converter to change the String value to the value you need.
// for example Long.parseLong(line) or Integer.parseInt(line) or other type cast

在这两种情况下，您需要将默认输入传递给您，在我的情况下为 System.in

Answer 7

使用：

char ch=**scanner.nextChar**()

Answer 8

我也有同样的挣扎，我就是这样用的：

} public static void main(String[] args) {

Scanner scan = new Scanner(System.in);
System.out.print("Please enter the string: ");
String input = scan.next();
System.out.print("Please enter the required symbol: ");
String symbol = scan.next();        
char symbolChar = symbol.charAt(0);

这很好用。 这个想法是从字符串中获取唯一的字符。

Answer 9

import java.util.Scanner;

class CheckVowel {

    public static void main(String args[]) {   
        Scanner obj= new Scanner(System.in);

        char a=obj.next().charAt(0);

        switch(a) {    
            case 'a':  //cases can be used together for the same statement
            case 'e':
            case 'i':
            case 'o':
            case 'u':
            case 'A':
            case 'E':
            case 'I':     
            case 'O':
            case 'U':
                     {
                System.out.println("Vowel....");   
                break;
               }    
            default:    
                System.out.println("Consonants....");
        }
    }
}

Answer 10

import java.util.Scanner;
public class Main{
public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   System.out.println("Enter a character:");
String str = next();
char c = str.charAt(0);
System.out.println(c);
sc.close();
}
[Output of this program.][1]}