java如何实现键盘输入字符

Question

如何实现键盘输入字符串
实现，编写程序实现：从键盘输入一个字符，输出加密后的字符。
加密规则是对每个字母转换为下一个字母表示，原来是 a 转换为 b，原来是 B 转换为C。小写的 z转换为小写的 a，大写的 Z 转换为大写的 A，每个数字不变。
会报错，

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    The method charAt(int) is undefined for the type Scanner
    The left-hand side of an assignment must be a variable
    Syntax error, insert "AssignmentOperator Expression" to complete Assignment
    Syntax error, insert ";" to complete Statement

import java.util.*;
public class T1_3 {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        char x=sc.charAt(0);
        if(x=='z')
            x='a';
        else if(x=='Z')
            x='A';
        else if(x>='a'&&x<'z')
            x=(char)(x+1);
        else(x>='A'&&x<'Z')
            x=(char)(x+1);
        System.out.println(x);        
    }

}

Answer 1

import java.util.*;

public class T1_3 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char x = sc.next().charAt(0);
        if (x == 'z')
            x = 'a';
        else if (x == 'Z')
            x = 'A';
        else if (x >= 'a' && x < 'z')
            x = (char)(x + 1);
        else if (x >= 'A' && x < 'Z')
            x = (char)(x + 1);
        System.out.println(x);
    }
}