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2010-06-01T05:18:59Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Execute the same statements for several different case labels ==



<source lang="java">
public class MainClass {

public static void main(String[] args) {
char yesNo = "N";
switch(yesNo) {
case "n": case "N":
System.out.println("No selected");
break;
case "y": case "Y":
System.out.println("Yes selected");
break;
}
}
}</source>



<pre class=codeResult>No selected</pre>

== Free Flowing Switch Statement Example ==



<source lang="java">
public class Main {
public static void main(String[] args) {
int i = 0;
switch (i) {
case 0:
System.out.println("i is 0");
case 1:
System.out.println("i is 1");
case 2:
System.out.println("i is 2");
default:
System.out.println("Free flowing switch example!");
}
}
}
/*
i is 0
i is 1
i is 2
Free flowing switch example!
*/</source>



== Nested Switch Statements Example ==



<source lang="java">
public class Main {
public static void main(String[] args) {
int i = 0;
switch (i) {
case 0:
int j = 1;
switch (j) {
case 0:
System.out.println("i is 0, j is 0");
break;
case 1:
System.out.println("i is 0, j is 1");
break;
default:
System.out.println("nested default case!!");
}
break;
default:
System.out.println("No matching case found!!");
}
}
}
//i is 0, j is 1</source>



== Switch statement with enum ==



<source lang="java">
public class MainClass {
enum Choice { Choice1, Choice2, Choice3 }
public static void main(String[] args) {
Choice ch = Choice.Choice1;
switch(ch) {
case Choice1:
System.out.println("Choice1 selected");
break;
case Choice2:
System.out.println("Choice2 selected");
break;
case Choice3:
System.out.println("Choice3 selected");
break;
}
}
}</source>



<pre class=codeResult>Choice1 selected</pre>

== The switch Statement ==

<OL><LI>An alternative to a series of else if is the switch statement.</LI><LI>The switch statement allows you to choose a block of statements to run from a selection of code, based on the return value of an expression.</LI><LI>The expression used in the switch statement must return an int or an enumerated value.</LI></OL>
<p>The syntax of the switch statement is as follows.</p>



<source lang="java">
switch (expression) {
case value_1 :
statement (s);
break;
case value_2 :
statement (s);
break;
.
.
.
case value_n :
statement (s);
break;
default:
statement (s);
}</source>



== The switch Statement: a demo ==



<source lang="java">
public class MainClass {
public static void main(String[] args) {
int choice = 2;
switch (choice) {
case 1:
System.out.println("Choice 1 selected");
break;
case 2:
System.out.println("Choice 2 selected");
break;
case 3:
System.out.println("Choice 3 selected");
break;
default:
System.out.println("Default");
break;
}
}
}</source>



<pre class=codeResult>Choice 2 selected</pre>

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Admin: 1 версия

в 17:44, 31 мая 2010