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  1749  次浏览      27
 

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1.Ò»¸öÒì³£ÊÇÔÚÒ»¸ö³ÌÐòÖ´Ðйý³ÌÖгöÏÖµÄÒ»¸öʼþ£¬ËüÖжÏÁËÕý³£Ö¸ÁîµÄÔËÐÐ

2.´íÎ󣬯«ÀëÁ˿ɽÓÊܵĴúÂëÐÐΪµÄÒ»¸ö¶¯×÷»òʵÀý

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1¡¢ÔËÐÐʱÒì³£(δ¼ì²éÒì³£)

2¡¢±àÒëʱÒì³£(ÒѼì²éÒì³£)

ÔËÐÐÒì³£¼´ÊÇRuntimeException;ÆäÓàµÄÈ«²¿Îª±àÒëÒì³£

ÔÚJavaÖÐÒì³£ExceptionºÍ´íÎóErrorÓиö¹²Í¬µÄ¸¸ÀàThrowable¡£

Error Exception

runtimeException¼¸¸ö×ÓÀà

1¡¢ java.lang.ArrayIndexOutOfBoundsException

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2¡¢java.lang.ArithmeticException

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3¡¢java.lang.NullPointerException

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4¡¢java.lang.ClassNotFoundException

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try{}catch{}
try{}catch{}finally{}ÎÞÂÛÓÐÎÞÒì³£finally´úÂë¿é¶¼»á±»Ö´ÐÐ
try{}finally{}Ò²ÊÇ¿ÉÒÔ×éºÏʹÓõĵ«ÊÇcatch{}finally{}²»¿ÉÒÔ

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Àý1. Õâ¸öÀý×ÓÖ÷Ҫͨ¹ýÁ½¸ö·½·¨¶Ô±ÈÀ´ÑÝʾһÏÂÓÐÁËÒì³£ÒÔºó´úÂëµÄÖ´ÐÐÁ÷³Ì¡£

public static void testException1() {
int[] ints = new int[] { 1, 2, 3, 4 };
System.out.println("Òì³£³öÏÖǰ");
try {
System.out.println(ints[4]);
System.out.println("ÎÒ»¹ÓÐÐÒÖ´Ðе½Âð");// ·¢ÉúÒì³£ÒԺ󣬺óÃæµÄ´úÂë²»Äܱ»Ö´ÐÐ
} catch (IndexOutOfBoundsException e) {
System.out.println("Êý×éÔ½½ç´íÎó");
}
System.out.println("Òì³£³öÏÖºó");
}

/*output:

Òì³£³öÏÖǰ

Êý×éÔ½½ç´íÎó

³£³öÏÖºó

*/

public static void testException2() {
int[] ints = new int[] { 1, 2, 3, 4 };
System.out.println("Òì³£³öÏÖǰ");
System.out.println(ints[4]);
System.out.println("ÎÒ»¹ÓÐÐÒÖ´Ðе½Âð");// ·¢ÉúÒì³£ÒÔºó£¬ËûºóÃæµÄ´úÂë²»Äܱ»Ö´ÐÐ
}

Ê×ÏÈÖ¸³öÀý×ÓÖеIJ»×ãÖ®´¦£¬IndexOutofBoundsExceptionÊÇÒ»¸ö·ÇÊܼìÒì³££¬ËùÒÔ²»ÓÃtry¡­catch¡­ÏÔʾ²¶×½£¬µ«ÊÇÎÒµÄÄ¿µÄÊǶÔͬһ¸öÒì³£Óò»Í¬µÄ´¦Àí·½Ê½£¬¿´Ëü»áÓÐʲô²»Í¬µÄ¶ø½á¹û(ÕâÀïÒ²¾ÍÖ»ÄÜÓÃËü½«¾ÍÒ»ÏÂÁË)¡£Òì³£³öÏÖʱµÚÒ»¸ö·½·¨Ö»ÊÇÌø³öÁËtry¿é£¬µ«ÊÇËüºóÃæµÄ´úÂë»áÕÕÑùÖ´Ðеġ£µ«ÊǵڶþÖ־Ͳ»Ò»ÑùÁËÖ±½ÓÌø³öÁË·½·¨£¬±È½ÏǿӲ¡£´ÓµÚÒ»¸ö·½·¨ÖÐÎÒÃÇ¿´µ½£¬try¡­catch¡­ÊÇÒ»ÖÖ¡±ÊÂÎñÐÔ¡±µÄ±£ÕÏ£¬ËüµÄÄ¿µÄÊDZ£Ö¤³ÌÐòÔÚÒì³£µÄÇé¿öÏÂÔËÐÐÍê±Ï£¬Í¬Ê±Ëü»¹»á¸æÖª³ÌÐòÔ±³ÌÐòÖгö´íµÄÏêϸÐÅÏ¢(ÕâÖÖÏêϸÐÅÏ¢ÓÐʱҪÒÀÀµÓÚ³ÌÐòÔ±Éè¼Æ)¡£

Àý2. ÖØÐÂÅ׳öÒì³£

public class Rethrow {
public static void readFile(String file) throws FileNotFoundException {
try {
BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
} catch (FileNotFoundException e) {
e.printStackTrace();
System.err.println("²»ÖªµÀÈçºÎ´¦Àí¸ÃÒì³£»òÕ߸ù±¾²»Ïë´¦ÀíËü£¬ µ«ÊDz»×ö´¦ÀíÓÖ²»ºÏÊÊ£¬ÕâÊÇÖØÐÂÅ׳öÒì³£½»¸øÉÏÒ»¼¶´¦Àí");
//ÖØÐÂÅ׳öÒì³£
throw e;
}
}
public static void printFile(String file) {
try {
readFile(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
printFile("D:/file");
}
}

Òì³£µÄ±¾ÒâÊǺõģ¬ÈÃÎÒÃÇÊÔͼÐÞ¸´³ÌÐò£¬µ«ÊÇÏÖʵÖÐÎÒÃÇÐÞ¸´µÄ¼¸ÂʺÜС£¬ÎÒÃǺܶàʱºò¾ÍÊÇÓÃËüÀ´¼Ç¼³ö´íµÄÐÅÏ¢¡£Èç¹ûÄãÑá¾ëÁ˲»Í£µÄ´¦ÀíÒì³££¬ÖØÐÂÅ׳öÒì³£¶ÔÄãÀ´Ëµ¿ÉÄÜÊÇÒ»¸öºÜºÃµÄ½âÍÑ¡£Ô­·â²»¶¯µÄ°ÑÕâ¸öÒì³£Å׸øÉÏÒ»¼¶£¬Å׸øµ÷ÓÃÕâ¸ö·½·¨µÄÈË£¬ÈÃËûÀ´·ÑÄÔ½î°É¡£ÕâÑù¿´À´£¬javaÒì³£(µ±È»Ö¸µÄÊÇÊܼìÒì³£)ÓÖ¸øÎÒÃÇÆ½ÌíºÜ¶àÂé·³£¬¾¡¹ÜËüµÄ³ö·¢µãÊǺõġ£

Àý3. Òì³£Á´µÄʹÓü°Òì³£¶ªÊ§

ExceptionA,ExceptionB,ExceptionC
public class ExceptionA extends Exception {
public ExceptionA(String str) {
super();
}
}
public class ExceptionB extends ExceptionA {
public ExceptionB(String str) {
super(str);
}
}
public class ExceptionC extends ExceptionA {
public ExceptionC(String str) {
super(str);
}
}

Òì³£¶ªÊ§µÄÇé¿ö£º

public class NeverCaught {
static void f() throws ExceptionB{
throw new ExceptionB("exception b");
}
static void g() throws ExceptionC {
try {
f();
} catch (ExceptionB e) {
ExceptionC c = new ExceptionC("exception a");
throw c;
}
}
public static void main(String[] args) {
try {
g();
} catch (ExceptionC e) {
e.printStackTrace();
}
}
}
/*
exception.ExceptionC
at exception.NeverCaught.g(NeverCaught.java:12)
at exception.NeverCaught.main(NeverCaught.java:19)
*/

ΪʲôֻÊÇ´òÓ¡³öÀ´ÁËExceptionC¶øÃ»ÓдòÓ¡³öExceptionBÄØ?Õâ¸ö»¹ÊÇ×Ô¼º·ÖÎöһϰÉ!

ÉÏÃæµÄÇé¿öÏ൱ÓÚÉÙÁËÒ»ÖÖÒì³££¬ÕâÔÚÎÒÃÇÅÅ´íµÄ¹ý³ÌÖзdz£µÄ²»Àû¡£ÄÇÎÒÃÇÓöµ½ÉÏÃæµÄÇé¿öÓ¦¸ÃÔõô°ìÄØ?Õâ¾ÍÊÇÒì³£Á´µÄÓÃÎäÖ®µØ£º±£´æÒì³£ÐÅÏ¢£¬ÔÚÅ׳öÁíÍâÒ»¸öÒì³£µÄͬʱ²»¶ªÊ§Ô­À´µÄÒì³£¡£

public class NeverCaught {
static void f() throws ExceptionB{
throw new ExceptionB("exception b");
}
static void g() throws ExceptionC {
try {
f();
} catch (ExceptionB e) {
ExceptionC c = new ExceptionC("exception a");
//Òì³£Á¬
c.initCause(e);
throw c;
}
}
public static void main(String[] args) {
try {
g();
} catch (ExceptionC e) {
e.printStackTrace();
}
}
}
/*
exception.ExceptionC
at exception.NeverCaught.g(NeverCaught.java:12)
at exception.NeverCaught.main(NeverCaught.java:21)
Caused by: exception.ExceptionB
at exception.NeverCaught.f(NeverCaught.java:5)
at exception.NeverCaught.g(NeverCaught.java:10)
... 1 more
*/

Õâ¸öÒì³£Á´µÄÌØÐÔÊÇËùÓÐÒì³£¾ù¾ß±¸µÄ£¬ÒòΪÕâ¸öinitCause()·½·¨ÊÇ´ÓThrowable¼Ì³ÐµÄ¡£

Àý4. ÇåÀí¹¤×÷

ÇåÀí¹¤×÷¶ÔÓÚÎÒÃÇÀ´ËµÊDZز»¿ÉÉٵģ¬ÒòΪÈç¹ûһЩÏûºÄ×ÊÔ´µÄ²Ù×÷£¬±ÈÈçIO,JDBC¡£Èç¹ûÎÒÃÇÓÃÍêÒÔºóûÓм°Ê±ÕýÈ·µÄ¹Ø±Õ£¬ÄǺó¹û»áºÜÑÏÖØ£¬ÕâÒâζ×ÅÄÚ´æÐ¹Â¶¡£Òì³£µÄ³öÏÖÒªÇóÎÒÃDZØÐëÉè¼ÆÒ»ÖÖ»úÖÆ²»ÂÛʲôÇé¿öÏ£¬×ÊÔ´¶¼Äܼ°Ê±ÕýÈ·µÄÇåÀí¡£Õâ¾ÍÊÇfinally¡£

public void readFile(String file) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(
new FileInputStream(file)));
// do some other work
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

Àý×ӷdz£µÄ¼òµ¥£¬ÊÇÒ»¸ö¶ÁÈ¡ÎļþµÄÀý×Ó¡£ÕâÑùµÄÀý×ÓÔÚJDBC²Ù×÷ÖÐÒ²·Ç³£µÄ³£¼û¡£(ËùÒÔ£¬ÎÒ¾õµÃ¶ÔÓÚ×ÊÔ´µÄ¼°Ê±ÕýÈ·ÇåÀíÊÇÒ»¸ö³ÌÐòÔ±µÄ»ù±¾ËØÖÊÖ®Ò»¡£)

Try¡­finally½á¹¹Ò²ÊDZ£Ö¤×ÊÔ´ÕýÈ·¹Ø±ÕµÄÒ»¸öÊֶΡ£Èç¹ûÄã²»Çå³þ´úÂëÖ´Ðйý³ÌÖлᷢÉúʲôÒì³£Çé¿ö»áµ¼ÖÂ×ÊÔ´²»Äܵõ½ÇåÀí£¬ÄÇôÄã¾ÍÓÃtry¶ÔÕâ¶Î¡±¿ÉÒÉ¡±´úÂë½øÐаü×°£¬È»ºóÔÚfinallyÖнøÐÐ×ÊÔ´µÄÇåÀí¡£¾ÙÒ»¸öÀý×Ó£º

public void readFile() {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(
new FileInputStream("file")));
// do some other work
//close reader
reader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

ÎÒÃÇ×¢ÒâÒ»ÏÂÕâ¸ö·½·¨ºÍÉÏÒ»¸ö·½·¨µÄÇø±ð£¬ÏÂÒ»¸öÈË¿ÉÄÜϰ¹ß¸üºÃÒ»µã£¬¼°ÔçµÄ¹Ø±Õreader¡£µ«ÊÇÍùÍùÊÂÓëԸΥ£¬ÒòΪÔÚreader.close()ÒÔǰÒì³£ËæÊ±¿ÉÄÜ·¢Éú£¬ÕâÑùµÄ´úÂë½á¹¹²»ÄÜÔ¤·ÀÈκÎÒì³£µÄ³öÏÖ¡£ÒòΪ³ÌÐò»áÔÚÒì³£³öÏֵĵط½Ìø³ö£¬ºóÃæµÄ´úÂë²»ÄÜÖ´ÐÐ(ÕâÔÚÉÏÃæÓ¦¾­ÓÃʵÀýÖ¤Ã÷¹ý)¡£ÕâʱÎÒÃǾͿÉÒÔÓÃtry¡­finallyÀ´¸ÄÔ죺

public void readFile() {
BufferedReader reader = null;
try {
try {
reader = new BufferedReader(new InputStreamReader(
new FileInputStream("file")));
// do some other work
// close reader
} finally {
reader.close();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

¼°ÔçµÄ¹Ø±Õ×ÊÔ´ÊÇÒ»ÖÖÁ¼ºÃµÄÐÐΪ£¬ÒòΪʱ¼äÔ½³¤ÄãÍü¼Ç¹Ø±ÕµÄ¿ÉÄÜÐÔÔ½´ó¡£ÕâÑùÔÚÅäºÏÉÏtry¡­finally¾Í±£Ö¤ÍòÎÞһʧÁË(²»ÒªÏÓÂé·³£¬java¾ÍÊÇÕâôÖйæÖоØ)¡£

ÔÙ˵һÖÖÇé¿ö£¬¼ÙÈçÎÒÏëÔÚ¹¹Ôì·½·¨Öдò¿ªÒ»¸öÎļþ»òÕß´´½¨Ò»¸öJDBCÁ¬½Ó£¬ÒòΪÎÒÃÇÒªÔÚÆäËûµÄ·½·¨ÖÐʹÓÃÕâ¸ö×ÊÔ´£¬ËùÒÔ²»ÄÜÔÚ¹¹Ôì·½·¨Öм°ÔçµÄ½«Õâ¸ö×ÊÔ´¹Ø±Õ¡£ÄÇÎÒÃÇÊDz»ÊǾÍûÕÞÁËÄØ?´ð°¸ÊÇ·ñ¶¨µÄ¡£¿´Ò»ÏÂÏÂÃæµÄÀý×Ó£º

public class ResourceInConstructor {
BufferedReader reader = null;
public ResourceInConstructor() {
try {
reader = new BufferedReader(new InputStreamReader(new FileInputStream("")));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
public void readFile() {
try {
while(reader.readLine()!=null) {
//do some work
}
} catch (IOException e) {
e.printStackTrace();
}
}
public void dispose() {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

ÕâÒ»²¿·Ö½²µÄ¶àÁËÒ»µã£¬µ«ÊÇÒ쳣ȷʵÊÇ¿´ÆðÀ´ÈÝÒ×ÓÃÆðÀ´ÄѵĶ«Î÷ѽ£¬javaÖл¹ÊÇÓкöàµÄ¶«Î÷ÐèÒªÉîÍڵġ£

   
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