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on September 24, 2015

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Throw and Throws keyword in Java.

In interview room most probably asking the question. Throw keyword: First, Forget about java all this thing For example Suppose I want to throw then someone going to catch. assume that here it's a ball game. and I throw the ball to catch someone person, were in java the person who throw the ball is the programmer and the other person catching that exception by JVM for that throw keyword is required. where which is throwable type is only thrown the exception, no other object or class you may throw. Look like.. Let us explain with an example. class Test{ public static void main(String args[]){ System.out.println(10/0); } } exception in thread main java.lang.arithmaticException / by zero at Test.main() In this case, which is the responsible for exception arise. JVM, JVM is responsible for exception handling. it's responsible internally automati...

Java 7 features

Strings in switch statement. public class StringSwitchCase { public static void main(String args) { String day = "SAT"; switch (day) { // switch on String selector case "MON": System.out.println("Monday"); break; case "TUE": System.out.println("Tuesday"); break; case "WED": System.out.println("Wednesday"); break; case "THU": System.out.println("Thursday"); break; case "FRI": System.out.println("Friday"); break; case "SAT": System.out.println("Saturday"); break; case "SUN": System.out.println("Sunday"); break; default: System.out.println("Invalid"); } } } Binary integer literals. You can exprese liternal value with 0b for (int,long and so). You are also permitted to use underscore ( _ ) to break the digits to improve the readability ...

Overriding With Varargs method

Most of the Interview Room question what is varargs. Varargs method overriding, overloading. Varargs : new concept came varargs with 1.5 version. varargs allows the method to multiple arguments. if you don't know how many parameter or argument will have to pass in the method, so varargs is better to use. m1(int i){} we can call this method exactly one value but m1(int... i){} if I can take like we can call this method any by passing any value including 0 number... so, you can take like obj.m1(10,20,30,40); now, Overriding with varargs method. I'm using an example to explain overriding ,overloading varargs method. class parentclass{ public void m1(int... i){ System.out.println("Parent"); } } class childclass extends parentclass{ public void m1(int i){ System.out.println("child"); } } public class MainClass{ public static void main(String agrs[]){ parentclass p = new parentclass(); p.m1(10); c...

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