classcastexception

问题 So, I'm working in Java, Trying to cast a java.sql.ResultSet to my own class MyResultSet Here is the code: MyResultSet.java public class MyResultSet implements java.sql.ResultSet{ //There are a bunch of Implemented Methods here. None of them have any custom code, They are all unchanged. Just didn't want to put huge code in here. } The code I'm trying to use to cast it ResultSet r = getResultSet(); return (MyResultSet)r; Whenever I run this, I get a "ClassCastException". Could someone explain

问题 I've been getting this class cast exception when trying to to implement an AffineTransform. Call to AffineTransform: public Shape moveToAndRotate(double x, double y, double theta) { double cx = getBounds2D().getCenterX(); double cy = getBounds2D().getCenterY(); at.translate(cx, cy); at.translate(x, y); at.rotate(Math.toRadians(theta)); at.translate(-cx, -cy); return at.createTransformedShape(yingYang); } This is resides in a custom shape class (YingYang). public class YingYang implements

问题 I am new to android application development. I was doing this tutorial app.It's a very simple one. It adds one and subtracts one from the counter.When I run it in the emulator ,it says "Unfortunately tutorial has stopped working." There are no errors in the code. The API level is 17. Please help me out. Code for java: public class Startingpoint extends Activity { int counter=0; Button add,subtract; TextView display; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate

问题 I am new to android application development. I was doing this tutorial app.It's a very simple one. It adds one and subtracts one from the counter.When I run it in the emulator ,it says "Unfortunately tutorial has stopped working." There are no errors in the code. The API level is 17. Please help me out. Code for java: public class Startingpoint extends Activity { int counter=0; Button add,subtract; TextView display; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate

问题 Following statement is not executing on some devices. AddEvent act1 = (AddEvent) getLocalActivityManager().getCurrentActivity(); Is there any alternate method for above statement. On some devices it works fine but on other devices it gives exception. Edit: My application is developed in tab. OnActivity results is used for getting picture from camera activity. Dont know where the resides but when I puts the above statement in try catch then no force close occurs and exception is shown there.

问题 Following statement is not executing on some devices. AddEvent act1 = (AddEvent) getLocalActivityManager().getCurrentActivity(); Is there any alternate method for above statement. On some devices it works fine but on other devices it gives exception. Edit: My application is developed in tab. OnActivity results is used for getting picture from camera activity. Dont know where the resides but when I puts the above statement in try catch then no force close occurs and exception is shown there.

问题 I have a really really really strange issue here. I have this line of code: SeekBar mProgressBar = (SeekBar) findViewById(R.id.SeekBar); And it throws a ClassCastException: android.widget.Button as the title indicates. The XML file looks like this: ... <SeekBar android:id="@+id/SeekBar" android:layout_height="wrap_content" android:layout_width="fill_parent" /> ... If I change the code to Button mProgressBar = (Button) findViewById(R.id.SeekBar); It "works" (e.i that single line works. The

问题 I have am deploying 2 EARs onto JBoss AS 7.1.0.Alpha1-SNAPSHOT (post 7.0.1.Final version). Both deploy fine. I have an EJB Singleton class packaged within a JAR, within one of the EARs: @Startup @Singleton // one of @Local(Store.class), @Remote(Store.class), @LocalBean @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) @Transactional(TransactionPropagation.SUPPORTS) public class StoreFront implements Store { ... public interface Store { ... When it deploys, it says the EJB is bound

问题 I have two different webapps, and each load the same class A with different classloader. When I put one instance in the session and then get it from the other webapp, a ClassCastException is thrown. For example, in webapp A, I store a in the session, then in webapp B, I get the a from the session and cast it to A, the ClassCastException is thrown. Is there a way to resolve this? 回答1: Is there a way to resolve this? Basically no. As far as the JLS is concerned, the types are different types,

问题 This question already has answers here : Casting to generic type in Java doesn't raise ClassCastException? (5 answers) Closed 5 years ago . I have some code which looks something like this (part of a negative test of the method get ): import java.util.*; public class Test { Map<String, Object> map = new HashMap<>(); public static void main (String ... args) { Test test = new Test(); test.put("test", "value"); // Store a String System.out.println("Test: " + test.get("test", Double.class)); //