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

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.

 

Posted Date: 7/25/2012 3:01:58 AM | Location : United States







Related Discussions:- What are the flow control statements in java? , Assignment Help, Ask Question on What are the flow control statements in java? , Get Answer, Expert's Help, What are the flow control statements in java? Discussions

Write discussion on What are the flow control statements in java?
Your posts are moderated
Related Questions
How to Begin a Variable Name with a Number? If you need to starts a variable name along with a digit, prefix the name you'd like to have (e.g. 8ball) along with an underscore,

write a program to find the minimum no of colors to fill a board where some of the elements of different color are already placed.

What is the difference between a while statement and a do while statement? A while statement checks at the starting of a loop to see whether the next loop iteration should occu

There are two different types of data in a JSP page. 1. Static part which occurs copied directly to the response by the JSP Engine. 2. Dynamic part, which have anything that

Android and Universal iOS, Multipurpose Testing App Universal iOS and Android, versatile Testing App Based on Phonegap with the subsequent main features * Support single answ

I have a very simple app that I have developed and is in the AppStore. I need the app to be developed for Android as it is presently in Objective C only. All plist html/ lists s

A framework for building server-side user interfaces for Web applications is written in the Java programming language.

For what purposes FTP is used in networks? FTP is known as file transfer protocol it is basically used to download or upload files / data to a remote computer.

This project is based on the teams example of chapter 1. Instead of teams, you will consider employees working in a department in a company. (Departments and employees are analog

Determine the phase Loading- Java Program Development In phase 3, the program must first be placed in memory before it can be executed. This is done by the class loader, whic