String字符串中获取所有匹配结果的索引值

例如现在我们有这样一段代码

public interface ActErrorHisMapper {    public List
    
      getPage(Map
     
       params);    public List
      
        getList(Map
       
         params);    public int getCount(Map
        
          params);}复制代码
        
       
      
     
    

我们要查找所有的public关键字出现的索引，那么可以这么写

public static List
    
      findAllIndex(String string,int index,String findStr){        List
     
       list =new ArrayList<>();        if (index != -1){            int num = string.indexOf(findStr,index);            list.add(num);            //递归进行查找            List myList = findAllIndex(string,string.indexOf(findStr,num+1),findStr);            list.addAll(myList);        }        return list;    }复制代码
     
    

这样调用即可

public static void main(String[] args) {        String string = "public interface ActErrorHisMapper {\n" + "\n"                + "    public List
    
      getPage(Map
     
       params);\n" + "\n"                + "    public List
      
        getList(Map
       
         params);\n" + "\n"                + "    public int getCount(Map
        
          params);\n" + "}";        List
         
           num = findAllIndex(string,0,"public"); for (Integer integer : num){ System.out.println(integer); } }复制代码
         
        
       
      
     
    

输出结果如下：

042106170复制代码