Explain switch statement in java language, JAVA Programming

Assignment Help:

Explain switch statement in java language?

Switch statements are shorthands for a certain type of if statement. It is not common to see a stack of if statements all related to the similar quantity like this:

if (x == 0) doSomething0();
else if (x == 1) doSomething1();
else if (x == 2) doSomething2();
else if (x == 3) doSomething3();
else if (x == 4) doSomething4();
else doSomethingElse();

Java has a shorthand for these kinds of multiple if statements, the switch-case statement. Here's how you'd write the above using a switch-case:

switch (x) {
  case 0: 
    doSomething0();
    break;
  case 1: 
    doSomething1();
    break;
  case 2: 
    doSomething2();
    break;
  case 3: 
    doSomething3();
    break;
  case 4: 
    doSomething4();
    break;
  default: 
    doSomethingElse();
}

In this fragment x must be a variable or expression in which can be cast to an int without loss of precision. This means the variable must be or the expression must return an int, byte, short or char. x is compared along with the value of each the case statements in succession until one matches. This fragment compares x to literals, other than these too could be variables or expressions as long as the variable or result of the expression is an byte, int, short or char. The default action is triggered if no cases are matched.

Once a match is found, all following statements are executed until the end of the switch block is reached or you break out of the block. This could trigger decidedly unexpected behavior. Thus it is general to involve the break statement at the end of each case block. It's excellent programming practice to put a break after each one unless you explicitly want all following statements to be executed.

It's significant to remember that the switch statement doesn't end while one case is matched and its action performs. A program then executes all statements in which follow in which switch block until specifically told to break.


Related Discussions:- Explain switch statement in java language

Java expert with tomcat tuning experience required, Java expert with tomcat...

Java expert with tomcat tuning experience needed Project Description: Want a Java expert to fix memory issues with tomcat. I need School java project - Threads Programm

Create objects of student class by calling default, Create objects of stude...

Create objects of student class by calling default Create objects of student class by calling default, parameterize and copy constructor Call student class different methods on

Calculates number of negative and positive numbers in array, Question 3 ...

Question 3 Using this line: var posneg : array [1..15] of integer; Write a program that calculates the number of negative and positive numbers in the array. Users will

Explain break statement in a loop, Explain break statement in a loop ? ...

Explain break statement in a loop ? A break statement exits a loop before an entry condition fails. For instance, in this variation on the CountWheat program an error messa

Difference between an application server and a web server, An application s...

An application server creates data for a Web server - as, collecting data from databases, processing security checks, applying relevant business programs, and/or storing the state

Explain ftp-telnet-voip and instant messaging, Write a brief note on each o...

Write a brief note on each of the following. FTP Telnet Instant messaging VoIP FTP: File Transfer Protocol: This protocol is used to upload and download the

Data structures programming, Colossus has just purchased a computer for it...

Colossus has just purchased a computer for its new automated reservation system. You have been asked to program the new system.  You are to write a program to assign seats on ea

I need ios and android developer, We need a very good iOS and/or Android de...

We need a very good iOS and/or Android developer preferred to be from Egypt. He will be responsible in developing iOS or/ and Android apps for a company. All details will be provid

What are the basic advantages of jms, JMS is asynchronous in nature. Theref...

JMS is asynchronous in nature. Therefore not all the pieces need to be up all the time for the application to function as a whole. Even if the receiver is down the MOM will kept th

JDBC Assignment, If we have 2 tables like bankcustomer(cid,cname,addr,acc_t...

If we have 2 tables like bankcustomer(cid,cname,addr,acc_type) and customeraccount(cid,amount). How to Deposit amount into the given customer account.?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd