如何通过从查询获得的结果中以字符串形式获取方法名称来从另一个类中调用Java中的方法

Question

I am trying to invoke method from another class by specifying the method name. The method name is received from the result obtained from a query...

Class:VAL

ps1=connection.prepareStatement("select method_name from validation where tablename=? and type_name=?");
ps1.setString(1, "table_name");
ps1.setString(2, "fieldtype");
ResultSet rs1 = null;
rs1=ps1.executeQuery();
while(rs1.next())
{
methname=rs1.getString(1);
}
rs1.close();
return status;

Now I should use this method name suppose if its methname="Alphanumeric" I should call this method written in class Special_validation from class VAL.

Class:Special_validation

Class Special_validation
{
public boolean Alphanumeric()
{
------
------
}
}

Answer 1

You could use java reflection.

A call to Class.getDeclaredMethod() would return a Method. You could use Method.invoke() to call this method.

You might also want to get function prototype, not just the name, before calling getDeclaredMethod()

Reference