Try catch finally usage

1. If the catch fails to throw an exception, the execution of the function will end. The code after the exception location will not be executed.

Public class test {</P> <p>/** <br/> * @ Param ARGs <br/> */<br/> Public static void main (string [] ARGs) {<br/> // todo auto-generated method stub <br/> system. out. println ("--- main () Start --->"); </P> <p> Hello (); </P> <p> testseq (); </P> <p> system. out. println ("--- main () end <---"); <br/>}</P> <p> Public static void Hello () {<br/> try {<br/> method (); <br/>} catch (nullpointerexception e) {<br/> E. printstacktrace (); <br/> system. out. println ("nullpointerexception occured. "); <br/>}finally {<br/> system. out. println ("finally... "); <br/>}</P> <p> system. out. println ("after hello"); <br/>}</P> <p> Public static void method () {<br/> // throw new nullpointerexception (); <br/> throw new arithmeticexception (); <br/>}</P> <p> Public static string testseq () {<br/> string result = ""; <br/> int I = 0; </P> <p> try {<br/> I = 7/I; <br/> system. out. println ("in try... "); <br/>}catch (nullpointerexception e) {<br/> E. printstacktrace (); <br/> system. out. println ("in catch... "); <br/>}finally {<br/> system. out. println ("in finally .... "); <br/>}< br/> system. out. println ("after... "); </P> <p> return result; <br/>}< br/>}

 

Output result:

--- Main () Start --->
Finally...
Exception in thread "Main" Java. Lang. arithmeticexception
At com. Min. Test. Method (test. Java: 35)
At com. Min. Test. Hello (test. Java: 22)
At com. Min. Test. Main (test. Java: 13)

 

2. Catch the thrown exception, and continue to execute this function. The code after the thrown exception location is also executed.

Package COM. min; </P> <p> public class test {</P> <p>/** <br/> * @ Param ARGs <br/> */<br/> Public static void main (string [] ARGs) {<br/> // todo auto-generated method stub <br/> system. out. println ("--- main () Start --->"); </P> <p> Hello (); </P> <p> testseq (); </P> <p> system. out. println ("--- main () end <---"); <br/>}</P> <p> Public static void Hello () {<br/> try {<br/> method (); <br/>} catch (nullpointerexception e) {<br/> E. printstacktrace (); <br/> system. out. println ("nullpointerexception occured. "); <br/>}finally {<br/> system. out. println ("finally... "); <br/>}</P> <p> system. out. println ("after hello"); <br/>}</P> <p> Public static void method () {<br/> throw new nullpointerexception (); <br/> // throw new arithmeticexception (); <br/>}</P> <p> Public static string testseq () {<br/> string result = ""; <br/> int I = 0; </P> <p> try {<br/> I = 7/I; <br/> system. out. println ("in try... "); <br/>}catch (nullpointerexception e) {<br/> E. printstacktrace (); <br/> system. out. println ("in catch... "); <br/>}finally {<br/> system. out. println ("in finally .... "); <br/>}< br/> system. out. println ("after... "); </P> <p> return result; <br/>}< br/>}

Output result:

--- Main () Start --->
Java. Lang. nullpointerexception
At com. Min. Test. Method (test. Java: 34)
At com. Min. Test. Hello (test. Java: 22)
At com. Min. Test. Main (test. Java: 13)
Nullpointerexception occured.
Finally...
After hello
In finally ....
Exception in thread "Main" Java. Lang. arithmeticexception:/by zero
At com. Min. Test. testseq (test. Java: 43)
At com. Min. Test. Main (test. Java: 15)