visual basic 2008 barcode generator The do while Loop in Java

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The do while Loop
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The do while loop is another iteration statement that works nearly identically to a while loop, with one exception As you learned in the previous section, the conditional expression in a while loop must be true for statements within the body of the while loop to execute at least once If the conditional expression is never true, those statements will never be executed However, statements within a do while loop execute at least once, even if the conditional expression is false Think of the do while loop as telling Java, Execute these statements and then check to see if the condition is true
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The do while loop has six components: the keyword do, the body of the do while loop defined by opening and closing braces, statements within the body of the do while loop, the keyword while, the conditional expression contained within parentheses, and a semicolon The following example shows how to use a do while loop in your program In this example, Java displays the value of x on the screen before evaluating the con ditional expression x > 0 Notice that the conditional expression is false, causing Java to exit the loop However, the statement within the body of the do while loop executed once Programmers commonly use a do while loop to display a menu and then read the menu selection from the keyboard because the menu is displayed at least once before the conditional expression evaluates the menu selection
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class Demo { public static void main (String args[]) { int x = 0; do { Systemoutprintln("Current value of x = " + x); } while (x > 0); } }
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A jump statement is another control statement that transfers control to another part of the program There are three kinds of jump statements: break, continue, and return
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break
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You were introduced to the break statement when you learned about the switch statement, the for loop, and the while loop The break statement tells Java to exit a code block defined by opening and closing braces and used in a loop or a switch statement
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CHAPTER 4 Control Structures
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continue
The continue statement is used within the body of a loop to tell Java to immediately return to the top of the loop without executing statements that appear below the continue statement This has the same effect as Java reaching the end of the loop The following example shows how the continue statement works in a program You ll notice that this example is a slight modification of the example used in the while loop section of this chapter The example begins by initializing variable x to zero Java is then told to enter the body of the while loop if the value of x is less than 5, which it is Inside the body of the while loop, Java displays the value of x before the continue statement has an opportunity to execute The value of x is then incremented, and Java is then told to determine whether the value of x is 3 If it s not, Java displays the value of x again before returning to the top of the loop However, when the value of x is 3, Java enters the body of the if statement and executes the continue statement The continue statement tells Java to return to the top of the loop and reevaluate the conditional expression of the while loop The while loop conditional expression is true, so Java reenters the body of the while loop and continues to executes those statements Notice that the second Systemoutprintln() statement isn t executed when the value of x is 3 because Java is told to skip that statement and return to the top of the loop
class Demo { public static void main (String args[]) { int x = 0; while (x < 5) { Systemoutprintln ("Before continue x = " + x); x++; if (x == 3) continue; Systemoutprintln ("After continue x = " + x); } } }
Here is the output of this program:
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