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2010-06-01T05:19:02Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Java"s "labeled while" loop ==



<source lang="java">
public class MainClass {
public static void main(String[] args) {
int i = 0;
outer: while (true) {
System.out.println("Outer while loop");
while (true) {
i++;
System.out.println("i = " + i);
if (i == 1) {
System.out.println("continue");
continue;
}
if (i == 3) {
System.out.println("continue outer");
continue outer;
}
if (i == 5) {
System.out.println("break");
break;
}
if (i == 7) {
System.out.println("break outer");
break outer;
}
}
}
}
}</source>



<pre class=codeResult>Outer while loop
i = 1
continue
i = 2
i = 3
continue outer
Outer while loop
i = 4
i = 5
break
Outer while loop
i = 6
i = 7
break outer</pre>

== The while Statement ==

<OL><LI>One way to create a loop is by using the while statement.</LI><LI>Another way is to use the for statement</LI></OL>
<p>The while statement has the following syntax.</p>



<source lang="java">
while (booleanExpression) {
statement (s)
}</source>



== Using the while loop to calculate sum ==



<source lang="java">
public class MainClass {
public static void main(String[] args) {
int limit = 20;
int sum = 0;
int i = 1;
while (i <= limit) {
sum += i++;
}
System.out.println("sum = " + sum);
}
}</source>



<pre class=codeResult>sum = 210</pre>

== While loop with double value ==



<source lang="java">
public class MainClass {
public static void main(String[] args) {
double r = 0;
while(r < 0.99d) {
r = Math.random();
System.out.println(r);
}
}
}</source>



<pre class=codeResult>0.4377278997305387
0.2688654455422754
0.36392537297385574
0.15254413511361042
0.6688621030424611
0.143156733550304
0.3867695752401421
0.6348496031126075
0.8262243996358971
0.057290108917235516
0.48887104413122007
0.9181002018325309
0.03580026338719999
0.6915245271034702
0.06281957479185263
0.7484170566879976
0.08309381253696246
0.7708638307798187
0.6586973690207539
0.3606321940413979
0.17404632324149583
0.1007512703731156
0.7971297767971545
0.4461084890266951
0.8627269068871244
0.04984737498714209
0.2597921665157922
0.5410470601800582
0.5779541886682865
0.1847556794086489
0.32127067165147705
0.12266607697656651
0.62729812639505
0.12191275953517977
0.72308829958122
0.5766115831015479
0.03444891261877858
0.3034596140603594
0.058872682884219985
0.85618745813345
0.07472991871327217
0.32676415639620604
0.6390549075075913
0.09246846051500635
0.9135703200463736
0.661365290176903
0.834153688687532
0.6340862529502882
0.3240420706550172
0.07246065490188025
0.35761285323105796
0.9964556875646731</pre>

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Java Tutorial/Statement Control/While Loop - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010