com.helger.commons.system

Enum EJavaVersion

java.lang.Object

java.lang.Enum<EJavaVersion>

com.helger.commons.system.EJavaVersion

All Implemented Interfaces:

Serializable, Comparable<EJavaVersion>

public enum EJavaVersion
extends Enum<EJavaVersion>

Enum for representing the current Java JDK version.

Author:

Philip Helger

Enum Constant Summary

Enum Constants

Enum Constant and Description
JDK_11
JDK_12
JDK_13
JDK_14
JDK_15
JDK_16
JDK_17
JDK_18
UNKNOWN

Method Summary

Methods

Modifier and Type	Method and Description
static EJavaVersion	getCurrentVersion()
static EJavaVersion	getFromMajorAndMinor(int nMajor, int nMinor) Get the matching Java version from a class version.
static EJavaVersion	getFromVersionNumber(double dVersion)
boolean	isCurrentVersion()
protected boolean	isMatchingVersion(double dVersion)
boolean	isNewerOrEqualsThan(EJavaVersion eJavaVersion) Check if this java version is newer or equals than the passed version
boolean	isSupportedVersion()
static EJavaVersion	valueOf(String name) Returns the enum constant of this type with the specified name.
static EJavaVersion[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

UNKNOWN

public static final EJavaVersion UNKNOWN

JDK_11

public static final EJavaVersion JDK_11

JDK_12

public static final EJavaVersion JDK_12

JDK_13

public static final EJavaVersion JDK_13

JDK_14

public static final EJavaVersion JDK_14

JDK_15

public static final EJavaVersion JDK_15

JDK_16

public static final EJavaVersion JDK_16

JDK_17

public static final EJavaVersion JDK_17

JDK_18

public static final EJavaVersion JDK_18

Method Detail

values

public static EJavaVersion[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (EJavaVersion c : EJavaVersion.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static EJavaVersion valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

isMatchingVersion

protected boolean isMatchingVersion(double dVersion)

isCurrentVersion

public boolean isCurrentVersion()

Returns:

true if this is the current version, false otherwise

isSupportedVersion

public boolean isSupportedVersion()

Returns:

true if this Java version is supported by the current Java Version. It is expected that all versions are backward compatible.

isNewerOrEqualsThan

public boolean isNewerOrEqualsThan(@Nonnull
                          EJavaVersion eJavaVersion)

Check if this java version is newer or equals than the passed version

Parameters:

eJavaVersion - the Java version to be checked. May not be null.

Returns:

true if this Java version is supported by the current Java Version. It is expected that all versions are backward compatible.

getCurrentVersion

@Nonnull
public static EJavaVersion getCurrentVersion()

Returns:

The current Java version. If the Java version could not be determined, UNKNOWN is returned and never null.

getFromMajorAndMinor

@Nonnull
public static EJavaVersion getFromMajorAndMinor(int nMajor,
                                        int nMinor)

Get the matching Java version from a class version.

Parameters:

nMajor - Major version number

nMinor - Minor version number

Returns:

UNKNOWN if the version could not be determined.

getFromVersionNumber

@Nonnull
public static EJavaVersion getFromVersionNumber(double dVersion)