What are the flow control statements in java? , JAVA Programming

Assignment Help:

The flow control statements give you to conditionally execute statements, to repeatedly operate a block of statements, or to just modify the sequential flow of control.

Looping

while, do-while, for

 

The body of the while loop is run only if the expression is true, so it cannot be executed even once:

 

while(i < 5){...}

 

The body of the do-while loop is run at least once because the test expression is evaluated only  after executing  the  loop  body.  Also, don't  forget  the  ending  semicolon  after  the  while expression.

 

do { ... } while(i < 5);

 

The for loop syntax is:

 

for(expr1; expr2; expr3)

{

// body

}

 

expr1 Æ is for initialization, expr2 Æ is the conditional test, and expr3 Æ is the iteration expression. Any of these sections may be omitted and the syntax will still be legal:

 

for( ; ; ) {} // an endless loop

Decision making

if-else, switch-case

 

The if-else statement is used for decision-making -- that is, it decides which course of action have to be taken.

 

if (x == 5) {...} else {..}

 

The switch statement is also used for decision-making, based on an integer expression. The argument passed to the switch and case statements could be int, char, short, or byte. The argument passed to the case statement could be a literal or a final variable. If no case matches, the default statement (which is optional) is executed.

 

int i = 1;

switch(i)

{

case 0:

System.out.println("Zero");break; //if break; is omitted case 1: also executed

case 1:

System.out.println("One");break; //if break; is omitted default: also executed

default: System.out.println("Default");break;

}

Branching

break, continue, label:, return

 

The break statement is needed to exit from a loop or switch statement, while the continue statement is needed to skip just the current iteration and continue with the next. The return is used to return from a function based on a condition. The label statements may lead to unreadable and unmaintainable spaghetti code hence should be avoided.

Exception handling

try-catch-finally, throw

 

Exceptions may be used to define ordinary flow control. This is a misuse of the idea of exceptions, which are meant only for exceptional conditions and hence should be avoided.

 


Related Discussions:- What are the flow control statements in java?

How many modules are there in spring, Spring comprises of seven modules. Th...

Spring comprises of seven modules. They are.. a) The core container b) Spring context c) Spring AOP d) Spring DAO e) Spring ORM f)  Spring Web module g)  Sprin

State the verify phase of java program development, State the Verify phase ...

State the Verify phase of Java Program Development Before the bytecodes in an application are executed by the java interpreter, they are verified by the bytecode verifier in

Write a programme to create a webpage that prints the name o, Write a progr...

Write a programme to create a webpage that prints the name of the STUDENT database in Wide Latin font and set the subtitle with description of the STUDENT to the screen. Set the pa

Determine about the runtime security manager, Determine about the runtime S...

Determine about the runtime Security Manager Java also has a runtime Security Manager can check which operations a specific piece of code is allowed to do. Consequently, java c

Loop statements, A loop is a set of commands which executes repeatedly till...

A loop is a set of commands which executes repeatedly till a denoted condition is met. JavaScript supports two loop statements: for & while. Additionally, you can employ the break

How can we define a computer screen, How can we define a computer screen? ...

How can we define a computer screen? A computer screen is define as use to display output of computer to the user. Computer screen is consists of pixels.

Confidentiality and privacy - security, The confidentiality and privacy may...

The confidentiality and privacy may be accomplished through encryption. Encryption may be: Private-key or symmetric: This is based on a single key. This needs the sender and the

What are the components of struts, Struts components can be classify into M...

Struts components can be classify into Model, View and Controller: ? Model: Components like business logic /business processes and data are the type of model. ? View: HTML, J

Create plug-in for adobe after effects, Project Description: We are seek...

Project Description: We are seeking software engineers to create a plug-in for Adobe after Effects (CS4 and above) that allows 3D extrusions for a layer. We are seeking somethin

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