課後作業

標籤：

一.下列語句哪一個將引起編譯錯誤?為什麼?哪一個會引起執行階段錯誤?為什麼?

m=d; d=m; d=(Dog)m; d=c; c=(Cat)m;

d=m;和d=c;引起編譯錯誤；

原因：

二.CatchWho.java

原始碼：

public class CatchWho {     public static void main(String[] args) {         try {             try {                 throw new ArrayIndexOutOfBoundsException();             }             catch(ArrayIndexOutOfBoundsException e) {                System.out.println(  "ArrayIndexOutOfBoundsException" +  "/內層try-catch");             }             throw new ArithmeticException();         }         catch(ArithmeticException e) {             System.out.println("發生ArithmeticException");         }         catch(ArrayIndexOutOfBoundsException e) {            System.out.println(  "ArrayIndexOutOfBoundsException" + "/外層try-catch");         }     } }

三.CatchWho2.java

原始碼：

public class CatchWho2 {     public static void main(String[] args) {         try {            try {                 throw new ArrayIndexOutOfBoundsException();             }             catch(ArithmeticException e) {                 System.out.println( "ArrayIndexOutOfBoundsException" + "/內層try-catch");             }            throw new ArithmeticException();         }         catch(ArithmeticException e) {             System.out.println("發生ArithmeticException");         }         catch(ArrayIndexOutOfBoundsException e) {             System.out.println( "ArrayIndexOutOfBoundsException" + "/外層try-catch");         }     } }

四.EmbededFinally.java

原始碼：

public class EmbededFinally {        public static void main(String args[]) {                int result;                try {                        System.out.println("in Level 1");                        try {                                System.out.println("in Level 2");  // result=100/0;  //Level 2                                try {                                        System.out.println("in Level 3");                                           result=100/0;  //Level 3                                }                                 catch (Exception e) {                                        System.out.println("Level 3:" + e.getClass().toString());                                }                                                finally {                                        System.out.println("In Level 3 finally");                                }                                               // result=100/0;  //Level 2                            }                        catch (Exception e) {                                System.out.println("Level 2:" + e.getClass().toString());                        }             finally {                                System.out.println("In Level 2 finally");                        }                         // result = 100 / 0;  //level 1                }                 catch (Exception e) {                        System.out.println("Level 1:" + e.getClass().toString());                }                finally {           .             System.out.println("In Level 1 finally");                }        }}

五.課後作業

原始碼：

package zuoye3;import java.util.Scanner;public class Fenshu {    public static void main(String[] args)    {        int s = 0,a=0;        System.out.println("請輸入分數");        Scanner b=new Scanner(System.in);        try        {        s=Integer.parseInt(b.next());        if(s>90&&s<=100){        a=1;        }else if(s>80&&s<=90){        a=2;        }else if(s>70&&s<=80){        a=3;        }else if(s>60&&s<=70){        a=4;        }else if(s>=0&&s<=60){        a=5;        }        switch(a)        {        case 1:        {            System.out.println("優");        break;        }        case 2:        {            System.out.println("良");            break;        }        case 3:        {            System.out.println("中");            break;        }        case 4:        {            System.out.println("及格");            break;        }        case 5:        {            System.out.println("不及格");            break;        }        }            }            catch(Exception e){        System.out.println("錯誤");            }}    }

 

課後作業