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Java has checked and unchecked exceptions.
Checked exceptions are those which are checked at compile time.
The designers of java believe that the program can recover from checked exceptions eg: IOException, FileNotFoundException.

The unchecked exceptions are those that occur at run time.
It is not possible to recover from unchecked exceptions like RunTimeExceptions, NullPointerExceptions.

those exception that has to checked at compile time called checked exception

Exception which are caught at compile time are checked exceptions. For more questions and answers please visit - javadiscover.blogspot.com

exception that must be handled in code like IO Exception

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There are 2 types of Exception in Java:
1) Checked
2) UnChecked

1) Checked exception are those exceptions which you have to catch At compile time, when you compile your java programe your compiler check for checked exceptions in your program if it occurs it gives you Exception Stack. Eg, IOException, FileNotFoundException etc.

Note: All Exceptions are Checked except RunTimeException and its sub classes.