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Exceptions are generated by the Java Virtual Machine during program execution. When the JVM comes across a piece of code that it cannot execute properly or a piece of code that will create issues when the JVM executes it will generate an exception. Ex: divide by 0 or trying to access a null variable etc
The language also has syntax that can catch and handle these situations. It is called the try - catch - finally construct.
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Is it essential to catch all the exceptions and justify your answer?
Checked exceptions should be caught. Otherwise, compile errors are generated.
Why use catch keyword in java?
no, because catch is used to handle exceptions which are generated from try block
What is the implication of catching all the exceptions with the type Exception?
though catching exceptions is a good practice inside java code, catching all exceptions of the type exception is not the best way to go. Specific exceptions need to be caught instead of the generic Exception being caught. Also, different types of exceptions need to be handled separately.
What is the computer generated information that is displayed?
The computer-generated information that is displayed is usually referred to as "output".
Describe the JAVA throwable class hierarchy and types of exceptions?
In Java there are two main types of Exceptions. * Checked Exceptions - The ones that can be checked & handled in our code. Ex: I/O Exception, SQL Exception etc. In most cases, the compiler itself forces us to catch & handle these exceptions * Un-checked Exceptions - The ones that we cannot & should not handle in our code. Ex. Null Pointer Exception The java.lang.Throwable is the super class of all errors and exceptions in Java. Only objects of this class can be thrown & caught and handled by try-catch blocks. Ex: try { ..... ..... } catch (Exception e){ ... } finally { ... }
