Java by API/java.lang/Enum
Содержание
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>
