本文介绍了未处理的异常:java.lang.ClassNotFoundException错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下类代码,并且在进行调试时,它始终显示以下错误:
I have the following Class code and when Debug it kept showing the following error:
1。)未处理的异常:java.lang.ClassNotfoundException
2 。)未处理的异常:java.lang.NoSuchMethodException
1.) Unhandled Exception: java.lang.ClassNotfoundException2.) Unhandled Exception:java.lang.NoSuchMethodException
错误日志:
/apps/robotapp/Utils.java:32: error: exception IOException is never thrown in body of corresponding try statement
} catch (IOException e) {
^
/apps/robotapp/Utils.java:24: error: unreported exception ClassNotFoundException; must be caught or declared to be thrown
final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
^
/apps/robotapp/Utils.java:24: error: unreported exception NoSuchFieldException; must be caught or declared to be thrown
final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
^
/apps/robotapp/Utils.java:24: error: unreported exception IllegalAccessException; must be caught or declared to be thrown
final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
^
/apps/robotapp/Utils.java:25: error: unreported exception ClassNotFoundException; must be caught or declared to be thrown
final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
^
/apps/robotapp/Utils.java:25: error: unreported exception NoSuchFieldException; must be caught or declared to be thrown
final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
^
/apps/robotapp/Utils.java:25: error: unreported exception IllegalAccessException; must be caught or declared to be thrown
final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
^
/apps/robotapp/Utils.java:26: error: unreported exception NoSuchMethodException; must be caught or declared to be thrown
final long tck = (Long)os.getClass().getMethod("sysconf", Integer.TYPE).invoke(os, tckName);
^
/apps/robotapp/Utils.java:26: error: unreported exception IllegalAccessException; must be caught or declared to be thrown
final long tck = (Long)os.getClass().getMethod("sysconf", Integer.TYPE).invoke(os, tckName);
^
Note:
/RobotService.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
9 errors
FAILED
有错误的代码段:
try {
final String[] fields = stat.substring(stat.lastIndexOf(field2End)).split(fieldSep);
final long t = Long.parseLong(fields[fieldStartTime]);
final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
final long tck = (Long)os.getClass().getMethod("sysconf", Integer.TYPE).invoke(os, tckName);
return t * msInSec / tck;
} catch (final NumberFormatException e) {
throw new IOException(e);
} catch (final IndexOutOfBoundsException e) {
throw new IOException(e);
} catch (IOException e) {
throw new IOException(e);
}
推荐答案
您必须添加所有例外或全部使用catch:
You have to add all your exceptions or use a catch all:
try {
} catch(Exception exp) { }
更正后的代码:
try {
final String[] fields = stat.substring(stat.lastIndexOf(field2End)).split(fieldSep);
final long t = Long.parseLong(fields[fieldStartTime]);
final int tckName = Class.forName("libcore.io.OsConstants").getField("_SC_CLK_TCK").getInt(null);
final Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
final long tck = (Long)os.getClass().getMethod("sysconf", Integer.TYPE).invoke(os, tckName);
return t * msInSec / tck;
} catch (final NumberFormatException e) {
throw new IOException(e);
} catch (final IndexOutOfBoundsException e) {
throw new IOException(e);
} catch (java.lang.ClassNotfoundException e) {
throw new IOException(e);
} catch (java.lang.NoSuchMethodException e) {
throw new IOException(e);
} catch (IllegalAccessException e) {
throw new IOException(e);
}
您所捕获的IOException也被删除,因为它是(根据调试器)永不抛出。
Also the IOException you were catching, is removed since it is (according to the debugger) never thrown.
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