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?

Padovan series, write a program in java using array and scanner class to ge...

write a program in java using array and scanner class to generate padovan series

Determine the meaning of finalize, Determine the meaning of finalize W...

Determine the meaning of finalize When  a  finalize method  is  defined  in  a  class,  Java  run  time  calls  finalize() whenever  it's  about  to  recycle  an object  of  t

Continue statement in javascript, It terminates execution of the block of s...

It terminates execution of the block of statements in while or for loop & continues execution of the loop along with the next iteration. On the contrary to the break statement, con

What is a variable in java program, What is a variable in Java program? ...

What is a variable in Java program? It's a memory location. Memory location is given some name. Memory location is being assigned some value. Value may change o

What are the sub categories of artificial intelligence, What are the Sub ca...

What are the Sub categories of Artificial Intelligence? Briefly explain any two? 1. Expert systems: Expert system is in which system that is in some limited sense, could repl

What type of information can be stored in a database, What type of informat...

What type of information can be stored in a database? In a database we can store several types of informations like: • Numbers, Booleans, text • Sounds • Images • Video

Develop a desktop application with lync 2013, Develop a desktop application...

Develop a desktop application with Lync 2013 Project Description: We want to make desktop application which interfaces to Lync 2013 ? Skills required are .NET, ASP, Java,

Explain the concept of inheritance, Question: (a) (i) Explain the conc...

Question: (a) (i) Explain the concept of inheritance. Illustrate your answer with a suitable Java example. (ii) Java does not support multiple inheritance but does provide

What is an immutable object, What is an immutable object? An immutable ...

What is an immutable object? An immutable object is one that we can't change once it's created. Steps involved in creation of an immutable object are: Make all of its data f

Write a program on filling rectangles, Write a program on Filling Rectangle...

Write a program on Filling Rectangles ? The drawRect() method draws an open rectangle, a box if you prefer. If you need to draw a filled rectangle, use the fillRect() method. O

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