Code sharing using the String method in Java to obtain the number of occurrences of a character and the maximum identical part of a character

This article mainly introduces the Java String method to obtain the number of occurrences of characters and the maximum identical part of characters, involving Java string traversal, comparison, calculation and other related operation skills. Friends in need can refer to this article

The example describes the Java String method to obtain the number of occurrences of characters and the largest portion of characters that are identical. Share it with everyone for your reference, the details are as follows:

package demo;
public class Test {
  public static void main(String[] args) {
    String str = "dasdalldsdslldsdszxll";
    System.out.println("count="+get(str,"ll"));//打印ll出现的次数
    String s1 = "asdhellovdvdvv";
    String s2 = "cvfhelloff";
    System.out.println("temp="+gett(s1,s2));//打印两个字符串最大相同的部分
  }
  /* public static int get(String str,String key)
  {
    int count = 0;
    int index = 0;//定义一个位置
    while((index = str.indexOf(key))!=-1)//直到取不到需要的字符结束循环
    {
      str = str.substring(index + key.length());//字符串长度变化获得新的字符串
      count++;
    }
    return count;
  }
  */
  //第二种方法，大同小异
  public static int get(String str,String key)
  {
    int count = 0;
    int index = 0;
    while((index = str.indexOf(key,index))!=-1)
    {
      index = index + key.length();
      count ++;
    }
    return count;
  }
  public static String gett(String s1,String s2)
  {
    String max = "";
    String min = "";
    max = s1.length() > s2.length()?s1:s2;
    min = max == s1?s2:s1;//取短的字符串比较节省内存
    for(int x = 0;x < min.length();x++)
    {
      for(int y = 0,z = min.length() -x;z!=min.length()+1;y++,z++)
      {
        String temp = min.substring(y,z);
        if(max.contains(temp))
          return temp;
      }
    }
    return "";
  }
}

Running results:

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