Difference between revisions of "While Loops"
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| − | {{1010Topic|Introduction=The while loop is a special form of [[Loops|loop]] that will continue to repeat as long as the [[test condition]] evaluates to ''true''.}} | + | {{1010Topic|Introduction=The while loop is a special form of [[Loops|loop]] that will continue to repeat as long as the [[test condition]] evaluates to ''true''.|Chapter_TOC=[[Loops]]}} |
==Syntax== | ==Syntax== | ||
Revision as of 21:47, 21 March 2007
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IntroductionThe while loop is a special form of loop that will continue to repeat as long as the test condition evaluates to true.
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{{{Body}}}
Syntax
In java, the while loop takes the form of
while(test condition)
{
...
statements
...
}
In this particular situation, the while loop will continue to iterate as long as the test condition evaluates to true
Uses
A while loop is useful in any situation where you don't know beforehand how often you want to repeat the block of code. Consider the following situation instance:
import javax.swing.JOptionPane;
public class Input
{
public static void main(String args[])
{
String done;
done = JOptionPane.showInputDialog("Enter a phrase, type quit to finish");
while(!done.equals("quit"))
{
System.out.println("Hello " + name);
done = JOptionPane.showInputDialog("Enter a phrase, type quit to finish");
}
}
}
This code will repeatedly ask the user for input, and display that input, until the user types quit.
