exception handling examples
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Exception Handling Examples
Exception in java with Example Program
1. Exception
An exception is a problem that arises during the execution of a program
Exception is a runtime error
An exception can occur for many different reasons, including the following:
A user has entered invalid data.
A file that needs to be opened cannot be found.
A network connection has been lost in the middle of communications, or the JVM has run out of memory.
Types of error:
Compile time error
Compile time error is any type of error that prevent a java program compile like a syntax error, a class not found, a bad file name for the defined
class, and so on.
Run time error
A runtime error means an error which happens, while the program is running. To deal with this kind of errors java define Exceptions. Exceptions
are objects represents an abnormal condition in the flow of the program. It can be either checked or unchecked.
1.2 Types of exception
Checked Exceptions
Errors
Runtime Exceptions
Checked Exception( handled at compile time.)
Environmental error that cannot necessarily be detected by testing; e.g. disk full, broken socket, database unavailable, etc. The Exception problemcan be overcome by implementing Try-Catch block.
Error
Virtual machine error: class not found, out of memory, no such method, illegal access to private field, etc
Runtime Exception(Unchecked Exception)
Programming errors that should be detected in testing: index out of bounds, null pointer, illegal argument, etc.
The Compiler never checks the Unchecked exception during the program compilation. For example, Dividing any number by zero is an unchecked
exception.
1.3Exception Hierarchy
1.4 Exception management
Exception can be managed through five keywords in java
1.try
2.catch
3.finally
4.throw
5.throws
try-used to keep the code that going to throw error
catch-used to catch and process the error thrown by try block
example for try /catch block:
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classSam
{
publicstaticvoidmain(String args[])
{
intk=0;
intmsg;
String s1=args[0];
String s2=args[1];
inti=IntegerparseInt(s1);
int!=IntegerparseInt(s2);
tr"
{
k=i#!;
S"stemoutprintln(k);
$
catc%(&'ception e)
{
S"stemoutprintln(error);
$
$
finally-A finally block of code always executes, whether or not an exception has occurred. Finally used for avoid resource leakage .
The finally clause is executed after a try-catch block has been executed .
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tr"{##*rotected code$catc%(&'ception+"pe1 e1){
##,atc% block$catc%(&'ception+"pe2 e2){
http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/ -
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##,atc% block$catc%(&'ception+"pe- e-){##,atc% block
$.inall"{##+%e .inall" block al/a"s e'ecutes$
Example for finally:
?
1,onnection conn; ## opened be.ore at t%e beginning o.t%e met%od
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tr"{## e'ecute a uer"$ catc%(S3&'ception e) {## %andles t%e e'ception dispal"ing a message /%atever$ .inall"{connclose();$
throw-throwis used to actually throw the exception
throws-throwsis declarative for the method. They are not interchangeable.
The following code shows how to handle multiple exceptions using thethrowskeyword.
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publicclass&'ample{ publicvoide'ception&'ample() { tr" { ## statements c%eck(); $ catc%(&'ception e)
{ ##statements $ $ ## multiple e'ceptions separated b" a comma
voidc%eck() t%ro/s4ull*ointer&'ception4egative5rra"Si6e&'ception { i.(.lag 7 0) t%ro/ne/4ull*ointer&'ception(); i.(arrsi6e 7 0) t%ro/ne/4egative5rra"Si6e&'ception();
$$
http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/http://candidjava.com/exception-in-java-with-example-program/ -
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Primarykey
This tutorial explains how to set a primary key for a table in mysql using java statement example, Load the mysql driver using Class.forName
method and create a connection to communicate with mysql database and then create a statement object to send and receive from java code and
use executeUpdate to execute the query. If we wants to change a column constrain to primary key using java use this tutorial
Java code:
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import!avasl,onnection;
import!avasl8river9anager;
import!avaslS3&'ception;
import!avaslStatement;
publicclass*rimar"ke" {
#::
: param args
:#
publicstaticvoidmain(String[] args) {
## +comm"sl!dbc8river>;
String url = >!dbc?m"sl?##local%ost#test>;
String u4ame =>root>;
String p/d = >root>;
,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url
http://candidjava.com/statement-primary-key-example-program-in-java-jdbc-mysql-database/http://candidjava.com/statement-primary-key-example-program-in-java-jdbc-mysql-database/ -
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u4ame p/d);
Statement stmt = conncreateStatement();
String sl = >5lter table student 5dd
primar" ke" (@ollA4o)>;
stmte'ecuteBpdate(sl);
S"stemoutprintln(>primar"ke" added
sucess.ull">);
$ catc%(,lass4otCound&'ception e) {
## +
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$
Output:
Unique statement:
This tutorial explains how to update a column constrainto unique in a table in mysql using java statement example, Load the mysql driver using
Class.forName method and create a connection to communicate with mysql database and then create a statement object to send and receive
from java code and use executeUpdate to execute the query.
Java code:
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import!avasl,onnection;
import!avasl8river9anager;
import!avasl@esultSet;
import!avaslS3&'ception;
import!avaslStatement;
publicclassBniue {
#::
: param args
:#
publicstaticvoidmain(String[] args) {
## +comm"sl!dbc8river>;
String url = >!dbc?m"sl?##local%ost#sec>;
String u4ame =>root>;
String p/d = >root>;
http://candidjava.com/statement-unique-example-program-in-java-jdbc-mysql-database/http://candidjava.com/statement-unique-example-program-in-java-jdbc-mysql-database/ -
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,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url u4ame p/d);
Statement stmt = conncreateStatement();
String sl = >create table student2(rollAno int 4create table sucess.ull">);
$ catc%(,lass4otCound&'ception e) {
## +
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$
$
$
Output:
Create statement:
This tutorial explains how to Create a table in mysql using java statement example, Load the mysql driver using Class.forName method and create
a connection to communicate with mysql database and then create a statement object to send and receive from java code and use
executeUpdate to execute the query . The following codes in this java tutorial explain how to Create a table named staff with columns as Fields,
Type, Null, Key, Default, Extra .
Java code:
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import!avasl,onnection;
import!avasl8river9anager;
import!avasl@esultSet;
import!avaslS3&'ception;
import!avaslStatement;
publicclass,reate+able {
#::
: param args
:#
publicstaticvoidmain(String[] args) {
http://candidjava.com/statement-create-table-example-program-in-java-jdbc-mysql-database/http://candidjava.com/statement-create-table-example-program-in-java-jdbc-mysql-database/ -
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## +comm"sl!dbc8river>;
String url = >!dbc?m"sl?##local%ost#test>;
String u4ame =>root>;
String p/d = >root>;
,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url u4ame p/d);
Statement stmt = conncreateStatement();
String sl = >create table sta..(name varc%ar(2D)department
varc%ar(D)sub!ectAname varc%ar(2D))>;
stmte'ecuteBpdate(sl);
S"stemoutprintln(>,reate+able sucess.ull">);
$ catc%(,lass4otCound&'ception e) {
## +
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tr"{
connclose();
$ catc%(S3&'ception e) {
## +
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u4ame p/d);
Statement stmt = conncreateStatement();
String sl = >delete .rom student /%ere
name=HraviH>;
stmte'ecuteBpdate(sl);
S"stemoutprintln(>8ata deleted
sucess.ull">);
$ catc%(,lass4otCound&'ception e) {
## +
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$
OUTPUT:
Data deleted successfully
SQ I!S"#T I!TO Statement:
This tutorial explains how to insert a single row into a table in mysql using java statement example, Load the mysql driver using Class.forName
method and create a connection to communicate with mysql database and then create a statement object to send and receive from java code and
use executeUpdate to execute the query. If we wants to add a new record into the table or to add a new row, just use this following code to
update the table with new record.
create table:
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createtablestudent(@ollA4o int(D)4amevarc%ar(2D)
8epartment varc%ar(E)5ddress varc%ar(-0));
uer"
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Java code:
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import!avasl,onnection;
import!avasl8river9anager;
import!avaslS3&'ception;
import!avaslStatement;
publicclass,reate+able {
#::
: param args
:#
publicstaticvoidmain(String[] args) {
## +comm"sl!dbc8river>;
String url = >!dbc?m"sl?##local%ost#test>;
String u4ame =>root>;
String p/d = >root>;
,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url
u4ame p/d);
Statement st= conncreateStatement();
String sl=>insert into student
values(H101HHsures%HHcseHHc%ennaiH)>;
ste'ecuteBpdate(sl);
S"stemoutprintln(>8ata Inserted
sucess.ull">);
http://candidjava.com/statement-insert-example-program-in-java-jdbc-mysql-database/http://candidjava.com/statement-insert-example-program-in-java-jdbc-mysql-database/ -
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$ catc%(,lass4otCound&'ception e) {
## +
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Data Inserted successfully
$lter statement:
This tutorial explains how to alter a table in mysql using java statement example, Load the mysql driver using Class.forName method and create aconnection to communicate with mysql database and then create a statement object to send and receive from java code and use executeUpdate
to execute the query . While creating student table there is only four columns namely Roll_NO, Name, Department, Address. The following codes
in this java tutorial explain how to alter a table and create a new column.
create table:
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createtablestudent(@ollA4o int(D)4amevarc%ar(2D)
8epartment varc%ar(E)5ddress varc%ar(-0));
uer"
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import!avaslStatement;
publicclass5lter {
#::
: param args
:#
publicstaticvoidmain(String[] args) {
## +comm"sl!dbc8river>;
String url = >!dbc?m"sl?##local%ost#test>;
String u4ame =>root>;
String p/d = >root>;
,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url
u4ame p/d);
Statement stmt = conncreateStatement();
String sl = >5lter table student 5dd
8ateAo.Abirt% date>;
stmte'ecuteBpdate(sl);
S"stemoutprintln(>table 5ltersucess.ull">);
$ catc%(,lass4otCound&'ception e) {
## +
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## +
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Update statement:
This tutorial explains how to update a existing row in a table in mysql using java statement example, Load the mysql driver using Class.forName
method and create a connection to communicate with mysql database and then create a statement object to send and receive from java code and
use executeUpdate to execute the query. Use update query to update a existing data in a table this will be helpful in modifying record in a table.
create table:
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createtablestudent(@ollA4o int(D)4amevarc%ar(2D)
8epartment varc%ar(E)5ddress varc%ar(-0));
uer"
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connclose();
$ catc%(S3&'ception e) {
## +
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8epartment varc%ar(E)5ddress varc%ar(-0));
uer"
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,onnection conn=null;
tr"{
,lass.or4ame(8river)ne/Instance();
conn = 8river9anagerget,onnection(url
u4ame p/d);
Statement stmt = conncreateStatement();
@esultSet rs = stmte'ecuteuer"(>S&3&,+ :
C@);
S"stemoutprintln(>select statement
sucess.ull" used>);
/%ile(rsne't()) {
String @ollAno=
rsgetString(>@ollAno>);
String name= rsgetString(>name>);
String department=
rsgetString(>department>);
String address=
rsgetString(>address>);
S"stemoutprint(@ollAnoJ >Kt>);
S"stemoutprint(nameJ >Kt>);
S"stemoutprint(departmentJ >Kt>);
S"stemoutprintln( addressJ >Kt>);
$
$ catc%(,lass4otCound&'ception e) {
## +
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catc%(&'ception e) {
## +
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#::
: aut%or candid!ava
: description?Lu..eredInputStream e'ample program .or
close() in !ava
:#
import!avaioCile;
import!avaioLu..eredInputStream;
import!avaioCileInputStream;
import!avaioCile4otCound&'ception;
import!avaioI&'ception /%ile reading
t%e .ile >J ioe);
$ .inall"{
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tr"{
i.(bin N= null)
binclose();
$ catc%(I
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publicstaticvoidmain(String[] args) t%ro/s&'ception
{
tr"{
String s=>candid>;##get t%e string
3ong l=ne/3ong(2OG);##get t%e long value
S"stemoutprintln(lvaluecandid>;##get t%e string
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S"stemoutprintln(3ongvalue
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{
S"stemoutprintln(n.eget9essage());##to print t%e e'ception massage
$
$
$
class8ee ##sub class
{
8ee(){$
void8ee() t%ro/s4umberCormat&'ception
{$
$
output
)*+
!ileOutputStream example program for get!"() () in java
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#::
:aut%or? candid!ava
:description? Cile
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Cile8escriptor .d = null;
booleanbool = .alse;
tr"{
## create ne/ .ile output stream
.os = ne/Cile,?##testt't>);
## get .ile descriptor instance
.d = .osgetC8();
## test i. t%e .ile is valid
bool = .dvalid();
## print
S"stemoutprint(>Is .ile validQ >J bool);
$ catc%(&'ception e') {
## i. an error occurs
e'printStack+race();
$ .inall"{
i.(.os N= null)
.osclose();
$
$
$
Output
is file valid? true
!ileInputStream example program for s#ip(long n) in java
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#::
:aut%or? candid!ava
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:description?
::#
import!avaioI,%aracter read? >J c);
$ catc%(&'ception e') {
## i. an" error occurs
e'printStack+race();
$ .inall"{
## releases all s"stem resources .rom t%e
streams
i.(.is N= null)
.isclose();
$
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$
$
Output
Character read: E
!ileOutputStream example program for write(int $) () in java
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#::
:aut%or? candid!ava
:description? Cile);
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## /rites b"te to t%e output stream
.os/rite(b);
## .lus%es t%e content to t%e underl"ing
stream
.os.lus%();
## create ne/ .ile input stream
.is = ne/CileInputStream(>,?##testt't>);
## read till t%e end o. t%e .ile
/%ile((i = .isread()) N= 1) {
## convert integer to c%aracter
c = (c%ar) i;
## prints
S"stemoutprint(c);
$
$ catc%(&'ception e') {
## i. an error occurs
e'printStack+race();
$ .inall"{
## closes and releases s"stem resources
.rom stream
i.(.os N= null)
.osclose();
i.(.is N= null)
.isclose();
$
$
$
Output
B
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!ileInputStream example program for close() in java
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#::
program ? CileInputStream e'ample program .or close()
in !ava
aut%or ? >candid>
date ? 2R1012
:#
import!avaioCileInputStream;
import!avaioI5vailable ?>Javailable);
S"stemoutprintln(> @ead ?>J c);
$
$ catc%(&'ception e) {
eprintStack+race();
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$ .inall"{
i.(.is N= null) {
.isclose();
$
$
$
$
Output
Available :5 Read :K
Available :4 Read :AAvailable :3 Read :R
Available :2 Read :T
Available :1 Read :H
Available :0 Read :I
BufferedInputStream example program for s#ip(long n) in java
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#::
program ? Lu..eredInputStream e'ample program .or
skip(long n) in !ava
aut%or ? >candid>
date ? 211112
:#
##!ava code
import!avaioLu..eredInputStream;
import!avaioCileInputStream;
import!avaioCilterInputStream;
import!avaioI
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publicstaticvoidmain(String[] args) t%ro/s&'ception {
InputStream is = null;
CilterInputStream .is = null;
inti = 0;
c%arc;
tr"{
is = ne/CileInputStream(>C?#kart%i#LIStreamSkip#kart%it't>);##
kart%it't
## content?kart%i
.is = ne/Lu..eredInputStream(is);
/%ile((i = .isread()) N= 1) {
c = (c%ar) i;
.isskip(-);
S"stemoutprintln(>,%aracter read? >J c);
$
$ catc%(I
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BufferedInputStream example program for reset() in java
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#::
: aut%or? candid!ava
: description? in P5M5 e'ample program .or
:#
import!avaioLu..eredInputStream;
import!avaioCileInputStream;
import!avaioI,%ar ? >J (c%ar)bisread());
S"stemoutprintln(>,%ar ? >J (c%ar)
bisread());
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## mark is set on t%e input stream
bismark(0);
S"stemoutprintln(>,%ar ? >J (c%ar)bisread());
S"stemoutprintln(>reset() invoked>);
## reset is called
bisreset();
## read and print c%aracters
S"stemoutprintln(>,%ar ? >J (c%ar)bisread());
S"stemoutprintln(>,%ar ? >J (c%ar)bisread());
$ catc%(&'ception e) {
eprintStack+race();
$ .inall"{
## releases an" s"stem resources associated
/it% t%e stream
i.(iStream N= null)
iStreamclose();
i.(bis N= null)
bisclose();
$
$
$
Output
Char : A
Char : B
Char : C
Char : D
reset() invoked
Char : D
Char : E
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%hread Example program for run()
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## +%read &'ample *rogram .or run()
#::
aut%or? ,andid!avacom
description? +%is program runs t%e run() met%od .irst
t%en e'ecutes t%e main met%od
:#
publicclass4e/ implements@unnable
{
publicvoidrun() ## run met%od starts %ere
{
tr"{
.or(inti=0;i711;iJJ)
{
S"stemoutprintln(i);
+%readsleep(1000); ##/aiting .or one second
$
$
catc%(&'ception e){$
$
publicstaticvoidmain(String a[])
{
4e/ n=ne/4e/(); ## creating a ne/ ob!ect
+%read t1=ne/+%read(n); ## creating a t%read ob!ect
t1run(); ## starting t%e run met%od
tr"{
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.or(int!=11;!721;!JJ)
{
S"stemoutprintln(!);
+%readsleep(1000);
$
$
catc%(&'ception e){$
$
$
output:
,
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.
/
+
)
*
0
1
2-,
--
-.
-/
-+
-)
-*
-0
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.,
&ava Program used to get the pathname of the file using getPath() method
Get Filepath program to get the pathname of the file.
"3ample Pro&ram
?
1 packageservice1;
http://candidjava.com/java-program-used-to-get-the-pathname-of-the-file-using-getpath-method/http://candidjava.com/java-program-used-to-get-the-pathname-of-the-file-using-getpath-method/ -
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import!avaioCile;
publicclassStrCilepat% {
publicstaticvoidmain(String[] args) {
Cile . = null;
String v;
booleanbool = .alse;
tr"{
## create ne/ .ile
. = ne/Cile(>testt't>);
## pat%name string .rom abstract pat%name
v = .get*at%();
## true i. t%e .ile pat% e'ists
bool = .e'ists();
## i. .ile e'ists
i.(bool) {
## prints
S"stemoutprint(>pat%name? >J v);
$
$ catc%(&'ception e) {
## i. an" error occurs
eprintStack+race();
$
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$
$
Output
pathname: test.txt
Description
Thejava.io.File.getPath()method converts the abstract pathname into pathname string. To separate the names in the name sequence the
resulting string uses the default name-separator character.
Declaration
Following is the declaration for java.io.File.getPath() method:
public StringgetPath()
Parameters
Not Applicable.
Return Value
The method returns pathname string form of this abstract pathname.
Exception
Not Applicable.