好吧,我正在尝试构建一个异常处理程序,我无法一辈子,弄清楚为什么它不起作用!我或多或少在以前的作业中做了完全相同的事情,而且效果很好。
所以这是异常处理程序类
package cst8284.asgmt3.scheduler;
public class BadAppointmentDataException extends RuntimeException{
private static final long serialVersionUID = 1L;
private String Description;
public String getDescription() {
return Description;
}
public void setDescription(String Description) {
this.Description = Description;
}
public BadAppointmentDataException(String m, String e) {
super(m);
this.setDescription(e);
}
public BadAppointmentDataException() {
this("Please Try Again","Bad Data Entered");
}
}
然后测试字符串,我使用了创建模式的方法
private static boolean testPhone(String p) {
Pattern pnum = Pattern.compile("\\d{3}\\-\\d{3}\\-\\d{4}");
Matcher m = pnum.matcher(p);
boolean b = m.matches();
return b;
}
正在确保正确输入电话号码。我已经测试了该方法,并且效果很好。
但是,当我这样做时,如果使用if语句,例如
if (!testPhone(phoneNumber)){
throw new BadAppointmentDataException("why doesn't this","work");
}
我收到未处理的异常错误,它指向指向调用BadAppointmentDataException
的行失败而崩溃!
您的BadAppointmentDataException
类不是异常处理程序。这是一个例外。您必须编写代码来处理异常,通常在catch
块中。例如,这将导致未处理的异常:
package demo;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Demo {
public static void main(String[] args) {
// this will result in an unhandled exception
doSomething();
}
private static void doSomething() {
if (!testPhone("some bad phone number")) {
throw new BadAppointmentDataException("why doesn't this", "work");
}
}
private static boolean testPhone(String p) {
Pattern pnum = Pattern.compile("\\d{3}\\-\\d{3}\\-\\d{4}");
Matcher m = pnum.matcher(p);
boolean b = m.matches();
return b;
}
}
这将处理异常:
package demo;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Demo {
public static void main(String[] args) {
try {
doSomething();
} catch (BadAppointmentDataException exc) {
// put your exception handling logic here...
System.err.println("An error has occurred");
}
}
private static void doSomething() {
if (!testPhone("some bad phone number")) {
throw new BadAppointmentDataException("why doesn't this", "work");
}
}
private static boolean testPhone(String p) {
Pattern pnum = Pattern.compile("\\d{3}\\-\\d{3}\\-\\d{4}");
Matcher m = pnum.matcher(p);
boolean b = m.matches();
return b;
}
}