异常类：NoLetterException 类和 NoDigitException_要求声明定义2个异常类:noletterexception类和nodigitexception类。再-优快云博客

本文链接：https://blog.youkuaiyun.com/cqwoniu/article/details/80815216

本文介绍如何定义两个自定义异常类NoLetterException和NoDigitException，并在一个People类中使用这些异常来验证输入字符串是否包含字母或数字。通过示例演示了如何在Java中创建并抛出这些异常。

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要求声明定义 2 个异常类：NoLetterException 类和 NoDigitException
类。再定义一个 People 类，该类中的 void printLetter(char c) throws 方法抛出
NoLetterException 异常，void printDigit(char c)方法抛出 NoDigitException 异常。

主类 ExceptionExample 对 2 个方法分别测试。

package D;
public class NoletterException extends Exception {

public NoletterException(String msg) {
super(msg);
}
@Override
public String toString () {
String str="没有字符";
return str;
}

}

public class NoDigitException extends Exception{
public NoDigitException (String msg) {
super(msg);
}
@Override
public String toString () {
String str="不包括数字";
return str;
}

}

package D;
import java.util.regex.*;
public class People {
public String str;
void PrintLetter(String s ) throws NoletterException {
String patternStr="[a-z[A-Z]]";
boolean result=Pattern.matches(patternStr, s);
if(result)
throw new NoletterException (str);
}
void PrintLetter1(String s ) throws NoDigitException {
String patternStr="[0-9]";
boolean result=Pattern.matches(patternStr, s);
if(result)
throw new NoDigitException (str);
}
/*patternStr str="";
* Pattern.matches(pattersStr,s);
*
*
*
*
* */

public static void main(String[] args) {

People people = new People();
try {
people.PrintLetter("1");
} catch (NoletterException e) {
e.printStackTrace();
}
try {
people.PrintLetter1("q");
} catch (NoDigitException e) {
e.printStackTrace();
}

}

}