Throws Clause
package com.myjava.exceptions;
public class MyThrowsClause
{
public static void main(String a[])
{
MyThrowsClause
mytc = new MyThrowsClause();
try
{
for(int i=0; i<5 i="" span="">
{
mytc.getJunk();
System.out.println(i);
}
}
catch (InterruptedException iex)
{
iex.printStackTrace();
}
}
public void getJunk() throws InterruptedException
{
Thread.sleep(1000);
}
}
Throw Clause
package com.myjava.exceptions;
public class MyExplicitThrow
{
public static void main(String a[])
{
try
{
MyExplicitThrow
met = new MyExplicitThrow();
System.out.println("length
of Junk is "+met.getStringSize("Junk"));
System.out.println("length
of Wrong is "+met.getStringSize("Wrong"));
System.out.println("length
of null string is "+met.getStringSize(null));
}
catch (Exception ex)
{
System.out.println("Exception
message: "+ex.getMessage());
}
}
public int getStringSize(String str)
throws Exception
{
if(str
== null)
{
throw new Exception("String
input is null");
}
return str.length();
}
}
Multiple Cache Blocks
package com.myjava.exceptions;
import java.net.MalformedURLException;
import java.net.URL;
public class MyMultipleCatchBlocks
{
public static void main(String a[])
{
MyMultipleCatchBlocks
mmcb = new MyMultipleCatchBlocks();
mmcb.execute(1);
mmcb.execute(2);
}
public void execute(int i)
{
try
{
if(i
== 1)
{
getIntValue("7u");
}
else
{
getUrlObj("www.junksite.com");
}
}
catch (NumberFormatException nfe)
{
System.out.println("Inside
NumberFormatException... "+nfe.getMessage());
}
catch (MalformedURLException mue)
{
System.out.println("Inside
MalformedURLException... "+mue.getMessage());
}
catch (Exception ex)
{
System.out.println("Inside
Exception... "+ex.getMessage());
}
}
public int getIntValue(String num)
{
return Integer.parseInt(num);
}
public URL getUrlObj(String
urlStr) throws MalformedURLException
{
return new URL(urlStr);
}
}
Finally Block
package com.myjava.exceptions;
public class MyFinallyBlock
{
public static void main(String[] a)
{
try
{
int i = 10/0;
}
catch(Exception ex)
{
System.out.println("Inside
1st catch Block");
}
finally
{
System.out.println("Inside
1st finally block");
}
try
{
int i = 10/10;
}
catch(Exception ex)
{
System.out.println("Inside
2nd catch Block");
}
finally
{
System.out.println("Inside
2nd finally block");
}
}
}
Java Custom Exception
package com.myjava.exceptions;
public class MyOwnException
{
public static void main(String[] a)
{
try
{
MyOwnException.myTest(null);
}
catch(MyAppException mae)
{
System.out.println("Inside
catch block: "+mae.getMessage());
}
}
static void myTest(String str) throws MyAppException
{
if(str
== null)
{
throw new MyAppException("String
val is null");
}
}
}
class MyAppException extends Exception
{
private String message = null;
public MyAppException()
{
super();
}
public MyAppException(String message)
{
super(message);
this.message
= message;
}
public MyAppException(Throwable cause)
{
super(cause);
}
public String toString()
{
return message;
}
public String getMessage()
{
return message;
}
}
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