问一个相关的java问题

构造一个setString的方法，实现动态设置类中记录的字符串，请问这要怎么编写

现编一个例子，仅供参考

public class Demo {
    private String text;

    public Demo(String text) {
        this.text = text;
    }

    public void setString(String text) {
        this.text = text;
    }

    public String getString() {
        return this.text;
    }

    public static void main(String[] args) {
        Demo demo = new Demo("12345");
        System.out.println(demo.getString());
        demo.setString("54321");
        System.out.println(demo.getString());
    }
}