JAVA课后作业第7章

精选文库7-1 编写一个异常类MyException，再编写一个类Student，该类有一个产生异常的方法speak(int m)。要求参数m的值大于1000时，方法抛出一个MyException对象。最后编写主类，在主方法中创建Student对象，让该对象调用speak()方法。public class MyException extends ExceptionString message;MyException(int m)message=数 + m+ 超过了1000;public String toString()return message ;public class Student public void speak (int m) throws MyExceptionif(m1000)MyException ex =new MyException (m);throw ex;elseSystem.out.println(输入的数是： +m);import java.util.Scanner;public class Test public static void main(String args) Student s = new Student();trySystem.out.println(请输入一个数：);Scanner sca = new Scanner (System.in);s.speak(sca.nextInt();catch (MyException e)System.out.print(e.toString();7-2 创建类Number，通过类中的方法count可得到任意两个数相乘的结果，并在调用该方法的主方法中使用try-catch语句捕捉可能发生的异常。public class Number int sum=0;public int count (int x,int y)return x*y;public static void main(String args) Number nu= new Number();int a =30;int b=18;int sum=0;trysum=nu.count(a, b);System.out.print(两个数的乘积是： +sum);catch (Exception e)e.printStackTrace();7-3 创建类Computer，该类中有一个计算两个数的最大公约数的方法，如果向该方法传递负整数，该方法就会抛出自定义异常。public class MyException extends ExceptionString message;MyException()message=输入的数不能为负数;public String toString()return message ;public class Student public static int maxCommonDivsor(int a,int b)if(ab)int temp = a;a=b;b=temp;while (a %b!=0)int temp =a%b;a=b;b=temp;return b;public int speak (int m,int n) throws MyExceptionif(m0)MyException ex =new MyException ();throw ex;else if(n0)MyException ex =new MyException ();throw ex;elsereturn maxCommonDivsor( m, n);import java.util.Scanner;public class Test1 public static void main(String args) System.out.print(请输入第一个数：);Scanner sca = new Scanner (System.in);int x= sca.nextInt();System.out.print(请输入第二个数：);Scanner sca1 = new Scanner (System.in);int y= sca.nextInt();tryStudent stu = new Student();stu.speak(x, y);catch (MyException e)System.out.print(e.toString();7-4 如何捕获异常？使用try-catch语句捕获异常7-5 简述异常处理的注意事项。（1）在