java - 接口(interface)错误

Question

在我的程序中，当我在下面一段代码中调用updateNextPortNum方法时，为什么这里有一个错误，说:“在这一行有多个标记
- 路由器无法解析
- newRouterIp 无法解析为变量”

else if (operType.equals("3")){
            System.out.println("Inpur router number: ");
            String routerNum = br.readLine();

            error ==> rm.updateNextPortNum(routerNum, newRouterIp, newPortNum);
        }

RouterManage 类中的调用函数:

class RouterManage {
    private ArrayList al = null;

    public RouterManage() {
        al = new ArrayList();
    }

    // add Router
    public void addRouter(Router router) {
        al.add(router);
    }

    // show information of Router
    public void showInfo(String routerNum) {
        for (int i = 0; i < al.size(); i++) {
            // take Router object out
            Router router = (Router) al.get(i);

            if (router.getRouterNum().equals(routerNum)) {
                System.out.println("Find this router, info of its: ");
                System.out.println("Router num: " + routerNum);
                System.out.println("Router IP: " + router.getRouterIp());
                System.out.println("Next Router PortNum: " + router.getNextPortNum());
            }
        }
    }

    // show information of Router
    public void showAllInfo(String routerNum, String routerIp, int nextPortNum) {
        for (int i = 0; i < al.size(); i++) {

            Router router = (Router) al.get(i);

            System.out.println("All router information: ");
            System.out.println("Router num: " + routerNum);
            System.out.println("Router IP: " + router.getRouterIp());
            System.out.println("Next Router PortNum: " + router.getNextPortNum());
        }
    }

    // change next port num
    public void updateNextPortNum(String routerNum, String newRouterIp, int newPortNum) {
        for (int i = 0; i < al.size(); i++) {
            Router router = (Router) al.get(i);

            if (router.getRouterNum().equals(routerNum)) {
                // change router's ip
                router.setRouterIp(newRouterIp);
                // change router port number
                router.setNextPortNum(newPortNum);
            }
        }
    }
}

我只是尝试写一个简单的界面来实现选择功能。

谢谢你们。

Answer 1

您必须创建一个字符串并传递给方法 updateNextPortNum。即使参数和自变量在同一个文件中具有相同的名称，范围规则也意味着它们是不同的变量。在条件检查 block 的范围内，创建一个字符串或分配/执行

String newRouterId = "192.168.1.1";