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我想不通为什么我不断收到以下错误与下面的代码:的Java找不到符号错误
HelloWorldApp.java:9:pushScreen(net.rim.device.api。 ui.Screen)在net.rim.device.api.ui.UiApplication不能应用于(com.beginningblackberry.helloworld.HelloWorldMainScreen) pushScreen(mainScreen);
HelloWorldMainScreen.java:10:找不到符号 符号:方法添加(net.rim.device.api.ui.component.LabelField) 位置:类com.beginningblackberry.helloworld.HelloWorldMainScreen 加载(的labelField);
\\HelloWorldApp.java
package com.beginningblackberry.helloworld;
import net.rim.device.api.ui.UiApplication;
class HelloWorldApp extends UiApplication {
HelloWorldApp() {
HelloWorldMainScreen mainScreen = new HelloWorldMainScreen();
pushScreen(mainScreen);
}
public static void main(String[] args){
HelloWorldApp app = new HelloWorldApp();
app.enterEventDispatcher();
}
}
\\ HelloWorldMainScreen.java
package com.beginningblackberry.helloworld;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.component.LabelField;
class HelloWorldMainScreen {
HelloWorldMainScreen() {
LabelField labelField = new LabelField("Hello World");
add(labelField);
}
}
实施是,'HelloWorldMainScreen'必须扩展'net.rim.device.api.ui.Screen '。 –
+1 Jigar and Ben。我在“类HelloWorldMainScreen”中省略了“扩展MainScreen”。谢谢 – Anthony