我遇到以下代码问题.我想匹配一个字符串.当我有一场比赛时,一切都很完美.如果找不到匹配项,则会抛出异常并导致强制关闭.
代码片段
private void validatePhoneNumberFormat(String t){
Pattern p = Pattern.compile("^Match this exactly!$");
Matcher m = p.matcher(t);
m.find();
if (m.group(0) != ""){
this.myString = m.group(0);
this.setIsValid(true);
this.setStatus(0);
} else {
this.myString = "Invalid Input String";
this.setIsValid(false);
this.setStatus(99); // String parsing error
}
}
logcat的
02-17 14:12:10.562: WARN/dalvikvm(3854): threadid=1: thread exiting with uncaught exception (group=0x40015560) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): FATAL EXCEPTION: main 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): java.lang.IllegalStateException: No successful match so far 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at java.util.regex.Matcher.ensureMatch(Matcher.java:607) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at java.util.regex.Matcher.group(Matcher.java:358) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.example.RegExTest.MyList.validateMyStringFormat(MyList.java:47) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.example.RegExTest.MyList.<init>(MyList.java:15) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.example.RegExTest.DataManagerActivity.readInputFile(DataManagerActivity.java:128) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.example.RegExTest.DataManagerActivity$2.onClick(DataManagerActivity.java:77) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.view.View.performClick(View.java:2485) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.view.View$PerformClick.run(View.java:9080) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.os.Handler.handleCallback(Handler.java:587) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.os.Handler.dispatchMessage(Handler.java:92) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.os.Looper.loop(Looper.java:123) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at android.app.ActivityThread.main(ActivityThread.java:3647) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at java.lang.reflect.Method.invokeNative(Native Method) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at java.lang.reflect.Method.invoke(Method.java:507) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 02-17 14:12:11.322: ERROR/AndroidRuntime(3854): at dalvik.system.NativeStart.main(Native Method) 02-17 14:12:11.402: WARN/ActivityManager(62): Force finishing activity com.android.example.RegExTest/.DataManagerActivity
解决方法
请尝试检查匹配：
if (m.matches()){
代替：
if (m.group(0) != ""){
