What is the purpose of using throws IOException?

The Java throws keyword is used to declare an exception. It gives an information to the programmer that there may occur an exception. So, it is better for the programmer to provide the exception handling code so that the normal flow of the program can be maintained.

What does IOException mean?

IOException is the base class for exceptions thrown while accessing information using streams, files and directories. The Base Class Library includes the following types, each of which is a derived class of IOException : DirectoryNotFoundException. EndOfStreamException. FileNotFoundException.

What does public static void main mean?

The keyword public static void main is the means by which you create a main method within the Java application. It’s the core method of the program and calls all others. It can’t return values and accepts parameters for complex command-line processing.

What is the meaning of static void?

static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating an object of the class. void means that the method has no return value. If the method returned an int you would write int instead of void .

What is the purpose of the throw and throws keywords?

Both throw and throws are concepts of exception handling in Java. The throws keyword is used to declare which exceptions can be thrown from a method, while the throw keyword is used to explicitly throw an exception within a method or block of code.

What is the output public static void main String args?

public static void main(String[] args) Java main method is the entry point of any java program. Its syntax is always public static void main(String[] args) . You can only change the name of String array argument, for example you can change args to myStringArgs .

What causes IOException?

It can throw an IOException when the either the stream itself is corrupted or some error occurred during reading the data i.e. Security Exceptions, Permission Denied etc and/or a set of Exceptions which are derived from IOEXception .

Why does BufferedReader throw IOException?

Some programs use the readLine() method of BufferedReader for input. This method throws an IOException when there is a problem reading. Programs that use BufferedReader for input need to do something about possible exceptions.

What is the difference between throws and throw?

The throw keyword is used to throw an exception explicitly. It can throw only one exception at a time. The throws keyword can be used to declare multiple exceptions, separated by a comma.

What does it mean when public static void main(String[] args) throws IOException?

0 what does it mean -> public static void main(String[] args) throws IOException it means, the main method is not catching any exceptions, instead it handles the IOExceptionby throwing it to the source which invoked the main method. You throw Exceptionif you want it to be handled by higher function or calling function.

What is the difference between public void and static void in Java?

1 Public: It is an Access modifier, which specifies from where and who can access the method. 2 Static: It is a keyword which is when associated with a method, makes it a class related method. 3 Void: It is a keyword and used to specify that a method doesn’t return anything. 4 main: It is the name of Java main method.

How to throw an IOException from the method foo()?

If the goal is to throw the exception from the foo()method, you need to declare it as follows: public void foo() throws IOException{ //do stuff throw new IOException(“message”); } Then in your main:

What is the use of Static Static in Java?

Static: It is a keyword which is when associated with a method, makes it a class related method. The main() method is static so that JVM can invoke it without instantiating the class. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main() method by the JVM.