输入一个字符串，查找出出现次数最多的字符

 1 public static void main(String[] args) {
 2         // TODO Auto-generated method stub
 3 
 4         System.out.println("请输入一个字符串：");
 5         String str = new Scanner(System.in).next();
 6         int[] a = new int[127];    
 7         char maxChar = 0;
 8         int max = 0;
 9         for(int i=0; i<str.length(); i++){
10             char c = str.charAt(i);
11             if(++a[c] > max){
12                 max = a[c];
13                 maxChar = c;
14             }            
15         }
16         System.out.println(maxChar + "   出现了     " + max + "   次");
17     }