Java统计字符串中字符出现次数的方法示例

package com.wenzhi;
import java.util.Scanner;
public class Test01 {
  public static void main(String args[]) {
    Scanner scan = new Scanner(System.in);
    System.out.println("请你输入字符");
    String str = scan.nextLine();
    Scanner scan1 = new Scanner(System.in);
    System.out.println("请输入你要查找的子字符串");
    String str1 = scan1.nextLine();
    int count = 0;
    int start = 0;
    while (str.indexOf(str1, start) >= 0 && start < str.length()) {
      count++;
      start = str.indexOf(str1, start) + str1.length();
    }
    System.out.println(str1 + "在" + str + "出现的次数为" + count);
  }
}