Java Android ClassCastException与TreeMap比较
我试图将一个双精度值与TreeMap对象中的另一个双精度值进行比较。在比较myPowerAvg和myMap.getmyMap.get2的行中,我遇到了以下错误。我不确定为什么会出现这个错误,因为我正在比较两个double。顺便说一句,这个方法是在一个线程中执行的Java Android ClassCastException与TreeMap比较,java,android,compare,treemap,Java,Android,Compare,Treemap,我试图将一个双精度值与TreeMap对象中的另一个双精度值进行比较。在比较myPowerAvg和myMap.getmyMap.get2的行中,我遇到了以下错误。我不确定为什么会出现这个错误,因为我正在比较两个double。顺便说一句,这个方法是在一个线程中执行的 12-10 22:12:30.524: ERROR/AndroidRuntime(1059): FATAL EXCEPTION: Thread-23 12-10 22:12:30.524: ERROR/AndroidRuntime(10
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): FATAL EXCEPTION: Thread-23
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): java.lang.ClassCastException: java.lang.String
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at java.lang.Integer.compareTo(Integer.java:36)
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at java.util.TreeMap.cmp(TreeMap.java:1317)
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at java.util.TreeMap.get(TreeMap.java:1282)
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at com.community.HomeActivity.setTopUsers(HomeActivity.java:159)
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at com.community.HomeActivity.access$0(HomeActivity.java:136)
12-10 22:12:30.524: ERROR/AndroidRuntime(1059): at com.community.HomeActivity$4.run(HomeActivity.java:127)
代码:
if(myPowerAvg < myMap.get(myMap.firstKey())){
TextView view = (TextView)findViewById(R.id.firstPlace);
}else{
TextView view = (TextView)findViewById(R.id.firstPlace);
view.setText("First Place: \n" + myMap.firstKey() + " " +
" at " + myMap.get(myMap.firstKey()) );
}
if(myPowerAvg < myMap.get(myMap.get(2)) && myPowerAvg > myMap.get(myMap.firstKey())){
TextView view = (TextView)findViewById(R.id.secondPlace);
view.setText("Second Place: \n" + AppStatus.mUserName + " " +
" at " + myPowerAvg;
}else{
TextView view = (TextView)findViewById(R.id.secondPlace);
view.setText("Second Place: \n" + myMap.get(2) + " " + " at " +
myMap.get(myMap.get(2)));
}
if(myPowerAvg < myMap.get(myMap.get(2)) && myPowerAvg > myMap.get(myMap.firstKey())){
TextView view = (TextView)findViewById(R.id.secondPlace);
view.setText("Second Place: \n" + AppStatus.mUserName + " " + " at "
+ myPowerAvg);
}else{
TextView view = (TextView)findViewById(R.id.secondPlace);
view.setText("Second Place: \n" + myMap.get(2) + " " + " at " +
myMap.get(myMap.get(2)));
}
你说myMap是一个树映射,但你调用的是myMap.get2。要获取的参数应该是字符串。哪一行是HomeActivity.java第159行?异常特别指出,您正试图将字符串转换为整数,显然,您不能。我的猜测是,您没有在TreeMap变量的声明中提供类型参数。不知何故,您正在比较一个字符串,它需要一个整数,反之亦然?而且编译器没有捕捉到它。我同意@MΓΓББLL关于从何处开始追踪此事的观点。如果您也发布myMap的声明,这会有所帮助。第159行是:ifmyPowerAvg