в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

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2010-05-31T14:40:14Z

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== Enum: compareTo(Object o) ==



<source lang="java">
/*
A comes before B
*/
enum Apple {
A, B, C, D, E
}

public class MainClass {
public static void main(String args[])
{
Apple ap, ap2, ap3;

ap = Apple.A;
ap2 = Apple.B;
ap3 = Apple.C;
if(ap.rupareTo(ap2) < 0)
System.out.println(ap + " comes before " + ap2);

if(ap.rupareTo(ap2) > 0)
System.out.println(ap2 + " comes before " + ap);

if(ap.rupareTo(ap3) == 0)
System.out.println(ap + " equals " + ap3);

System.out.println();

if(ap.equals(ap2))
System.out.println("Error!");

if(ap.equals(ap3))
System.out.println(ap + " equals " + ap3);

if(ap == ap3)
System.out.println(ap + " == " + ap3);
}
}

</source>



== Enum: equals(Object other) ==



<source lang="java">
/*
A comes before B
*/
enum Apple {
A, B, C, D, E
}

public class MainClass {
public static void main(String args[])
{
Apple ap, ap2, ap3;

ap = Apple.A;
ap2 = Apple.B;
ap3 = Apple.C;
if(ap.rupareTo(ap2) < 0)
System.out.println(ap + " comes before " + ap2);

if(ap.rupareTo(ap2) > 0)
System.out.println(ap2 + " comes before " + ap);

if(ap.rupareTo(ap3) == 0)
System.out.println(ap + " equals " + ap3);

System.out.println();

if(ap.equals(ap2))
System.out.println("Error!");

if(ap.equals(ap3))
System.out.println(ap + " equals " + ap3);

if(ap == ap3)
System.out.println(ap + " == " + ap3);
}
}

</source>



== Enum: name() ==



<source lang="java">
enum ProgramFlags {
showErrors(0x01),
includeFileOutput(0x02),
useAlternateProcessor(0x04);
private int bit;
ProgramFlags(int bitNumber)
{
bit = bitNumber;
}
public int getBitNumber()
{
return(bit);
}
}
public class EnumBitmapExample {
public static void main(String args[])
{
ProgramFlags flag = ProgramFlags.showErrors;
System.out.println("Flag selected is: " +
flag.ordinal() +
" which is " +
flag.name());
}
}

</source>



== Enum: ordinal() ==



<source lang="java">
/*
A 0
B 1
C 2
D 3
E 4
*/
enum Apple {
A, B, C, D, E
}

public class MainClass {
public static void main(String args[])
{
for(Apple a : Apple.values())
System.out.println(a + " " + a.ordinal());

}
}

</source>



== Enum: valueOf(String v) ==



<source lang="java">
/*
Here are all Apple constants
A
B
C
D
E
ap contains C
*/
enum Apple {
A, B, C, D, E
}

public class MainClass {
public static void main(String args[])
{
Apple ap;

System.out.println("Here are all Apple constants");
Apple allapples[] = Apple.values();
for(Apple a : allapples)
System.out.println(a);

System.out.println();

ap = Apple.valueOf("C");
System.out.println("ap contains " + ap);

}
}

</source>



== Enum: values() ==



<source lang="java">
/*
Here are all Apple constants
A
B
C
D
E
ap contains C
*/
enum Apple {
A, B, C, D, E
}

public class MainClass {
public static void main(String args[])
{
Apple ap;

System.out.println("Here are all Apple constants");
Apple allapples[] = Apple.values();
for(Apple a : allapples)
System.out.println(a);

System.out.println();

ap = Apple.valueOf("C");
System.out.println("ap contains " + ap);

}
}

</source>

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