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similar question,but ans is different so much?

 
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read following code:
code1:
public class AQuestion
{
public static void main(String args[])
{
System.out.println("Before Try");
try
{
}
catch(Throwable t)
{
System.out.println("Inside Catch");
}
System.out.println("At the End");
}
}
code2:
public class AQuestion
{
public static void main(String args[])
{
System.out.println("Before Try");
try
{
}
catch(java.io.IOException t)
{
System.out.println("Inside Catch");
}
System.out.println("At the End");
}
}
the code1 ans :3(No compiler error. The lines "Before Try" and "At the end" are printed on the screen. )
the code2 ans :1(Compiler error complaining about the catch block where no IOException object can ever be thrown. )
I cant understand why the two question so fimiliar ,but the result have distance so much?
 
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IOException is a Checked Exception, so you have to throw it explicitly to catch it!!
Try writing ArithmeticException instead of IOException in the catch block, compiler won't complain.!!
 
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