com.github.netty.core.util

类 SystemPropertyUtil

java.lang.Object

com.github.netty.core.util.SystemPropertyUtil

public final class SystemPropertyUtil
extends Object

Created by wangzihao on 2018/11/8/008. A collection of utility methods to retrieve and parse the values of the Java system properties.

方法概要

限定符和类型	方法和说明
static boolean	contains(String key) Returns true if and only if the system property with the specified key exists.
static String	get(String key) Returns the value of the Java system property with the specified key, while falling back to null if the property access fails.
static String	get(String key, String def) Returns the value of the Java system property with the specified
static boolean	getBoolean(String key, boolean def) Returns the value of the Java system property with the specified
static float	getFloat(String key, float def) Returns the value of the Java system property with the specified
static int	getInt(String key, int def) Returns the value of the Java system property with the specified
static long	getLong(String key, long def) Returns the value of the Java system property with the specified

从类继承的方法 java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

contains

public static boolean contains(String key)

Returns true if and only if the system property with the specified key exists.

参数:

key - key

返回:

contains boolean

get

public static String get(String key)

Returns the value of the Java system property with the specified key, while falling back to null if the property access fails.

参数:

key - key

返回:

the property value or null

get

public static String get(String key,
                         String def)

Returns the value of the Java system property with the specified

参数:

key - while falling back to the specified default value if the property access fails.

def - if there's no such property or if an access to the specified property is not allowed.

返回:

the property value.

getBoolean

public static boolean getBoolean(String key,
                                 boolean def)

Returns the value of the Java system property with the specified

参数:

key - while falling back to the specified default value if the property access fails.

def - if there's no such property or if an access to the specified property is not allowed.

返回:

the property value.

getFloat

public static float getFloat(String key,
                             float def)

Returns the value of the Java system property with the specified

参数:

key - while falling back to the specified default value if the property access fails.

def - if there's no such property or if an access to the specified property is not allowed.

返回:

the property value.

getInt

public static int getInt(String key,
                         int def)

Returns the value of the Java system property with the specified

参数:

key - while falling back to the specified default value if the property access fails.

def - if there's no such property or if an access to the specified property is not allowed.

返回:

the property value.

getLong

public static long getLong(String key,
                           long def)

Returns the value of the Java system property with the specified

参数:

key - while falling back to the specified default value if the property access fails.

def - if there's no such property or if an access to the specified property is not allowed.

返回:

the property value.