org.jupiter.common.util

类 Preconditions

java.lang.Object

org.jupiter.common.util.Preconditions

public class Preconditions
extends Object

Simple static methods to be called at the start of your own methods to verify correct arguments and state. jupiter org.jupiter.common.util

作者:

jiachun.fjc

方法概要

方法

限定符和类型	方法和说明
static void	checkArgument(boolean expression) Ensures the truth of an expression involving one or more parameters to the calling method.
static void	checkArgument(boolean expression, Object errorMessage) Ensures the truth of an expression involving one or more parameters to the calling method.
static <T> T	checkNotNull(T reference) Ensures that an object reference passed as a parameter to the calling method is not null.
static <T> T	checkNotNull(T reference, Object errorMessage) Ensures that an object reference passed as a parameter to the calling method is not null.

从类继承的方法 java.lang.Object

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

方法详细资料

checkNotNull

public static <T> T checkNotNull(T reference)

Ensures that an object reference passed as a parameter to the calling method is not null.

参数:

reference - an object reference

返回:

the non-null reference that was validated

抛出:

NullPointerException - if reference is null

checkNotNull

public static <T> T checkNotNull(T reference,
                 Object errorMessage)

Ensures that an object reference passed as a parameter to the calling method is not null.

参数:

reference - an object reference

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

返回:

the non-null reference that was validated

抛出:

NullPointerException - if reference is null

checkArgument

public static void checkArgument(boolean expression)

Ensures the truth of an expression involving one or more parameters to the calling method.

参数:

expression - a boolean expression

抛出:

IllegalArgumentException - if expression is false

checkArgument

public static void checkArgument(boolean expression,
                 Object errorMessage)

Ensures the truth of an expression involving one or more parameters to the calling method.

参数:

expression - a boolean expression

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

抛出:

IllegalArgumentException - if expression is false