What is throw and throws exception?
❮ Java Keywords Show ExampleThrow an exception if age is below 18 (print "Access denied"). If age is 18 or older, print "Access granted":
Try it Yourself » Definition and UsageThe There are many exception types available in Java: Differences between
Related PagesRead more about exceptions in our Java Try..Catch Tutorial. ❮ Java Keywords In this guide, we will discuss the difference between throw and throws keywords. Before going though the difference, refer my previous tutorials about throw and throws. 1. Throws clause is used to declare an exception, which means it works similar to the try-catch block. On the other hand throw keyword is used to throw an exception explicitly. 2. If we see syntax wise than throw is followed by an instance of Exception class and throws is followed by exception class names. throw new ArithmeticException("Arithmetic Exception"); and throws ArithmeticException; 3. Throw keyword is used in the method body to throw an exception, while throws is used in method signature to declare the exceptions that can occur in the statements present in the method. For example: ... void myMethod() { try { //throwing arithmetic exception using throw throw new ArithmeticException("Something went wrong!!"); } catch (Exception exp) { System.out.println("Error: "+exp.getMessage()); } } ... Throws: ... //Declaring arithmetic exception using throws void sample() throws ArithmeticException{ //Statements } ... 4. You can throw one exception at a time but you can handle multiple exceptions by declaring them using throws keyword. void myMethod() { //Throwing single exception using throw throw new ArithmeticException("An integer should not be divided by zero!!"); } .. Throws: //Declaring multiple exceptions using throws void myMethod() throws ArithmeticException, NullPointerException{ //Statements where exception might occur } These were the main differences between throw and throws in Java. Lets see complete examples of throw and throws keywords. Throw ExampleTo understand this example you should know what is throw keyword and how it works, refer this guide: throw keyword in java. public class Example1{ void checkAge(int age){ if(age<18) throw new ArithmeticException("Not Eligible for voting"); else System.out.println("Eligible for voting"); } public static void main(String args[]){ Example1 obj = new Example1(); obj.checkAge(13); System.out.println("End Of Program"); } } Output: Exception in thread "main" java.lang.ArithmeticException: Not Eligible for voting at Example1.checkAge(Example1.java:4) at Example1.main(Example1.java:10) Throws ExampleTo understand this example you should know what is throws clause and how it is used in method declaration for exception handling, refer this guide: throws in java. public class Example1{ int division(int a, int b) throws ArithmeticException{ int t = a/b; return t; } public static void main(String args[]){ Example1 obj = new Example1(); try{ System.out.println(obj.division(15,0)); } catch(ArithmeticException e){ System.out.println("You shouldn't divide number by zero"); } } } Output: You shouldn't divide number by zero What is difference between throws and throw exception?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 is a throw exception?Creating an exception object and handing it to the runtime system is called throwing an exception. After a method throws an exception, the runtime system attempts to find something to handle it.
What is throw in OOP?The keyword throw is used to raise exceptions. It could be used within a catch block to resolve another exception. It could also be used whenever we would like to raise an exception.
What is throws in Java?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.
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