1 import java.util.Scanner; 2  3 public class Chars_compare { 4     public static void main(String[] args) { 5  6         boolean is_con = false ;         7         System.out.println("提示，请输入一个字符串："); 8         Scanner sc = new  Scanner (System.in); 9         String toString = sc.next();　　//输入字符串10         char [] any_char = toString.toCharArray(); // .toCharArray 方法：将字符串转为字符串数组11         12         for (int i = 0;i < any_char.length;i++){13             if (any_char [i] == ‘A‘){14                 is_con = true ;15             }16         }17         18         if (is_con){19             System.out.println("该字符串中包含字母‘A’");20         }else {21             System.out.println("该字符串中无字母‘A’");22         }23         24     }25 }