判断任意字符，在字符串是否为结束字符

String    gg = "ifhiasjbhgagayrahahuaybcnzkfhi";
    
    //1.lastIndexOf方法
        
    String ll = "fhi";
    
    //System.out.println(ll.length());
    //System.out.println(gg.length());
            
    if (gg.lastIndexOf(ll) == gg.length() - ll.length())
    
    {
        System.out.println("判断 = " + true);
    }
        
    else
        System.out.println("判断 = " + false);
    

输出判断：

判断 = true