Java ExceptionInInitializerError类

ExceptionInInitializerError类重点
抛出ExceptionInInitializerError错误表示静态初始值设定项中发生意外异常。即计算静态初始值设定项或静态变量初始值设定项期间发生异常。

ExceptionInInitializerError类源码

package java.lang;/*** Signals that an unexpected exception has occurred in a static initializer.* An <code>ExceptionInInitializerError</code> is thrown to indicate that an* exception occurred during evaluation of a static initializer or the* initializer for a static variable.* 表示静态初始值设定项中发生意外异常。* 抛出ExceptionInInitializerError以指示在计算静态初始值设定项* 或静态变量初始值设定项期间发生异常。** <p>As of release 1.4, this exception has been retrofitted to conform to* the general purpose exception-chaining mechanism.  The "saved throwable* object" that may be provided at construction time and accessed via* the {@link #getException()} method is now known as the <i>cause</i>,* and may be accessed via the {@link Throwable#getCause()} method, as well* as the aforementioned "legacy method."* 从1.4版开始，此异常已进行了改装，以符合通用异常链接机制。* 可以在构造时提供并通过getException()方法访问的“保存的可丢弃对象”现在称为原因，* 可以通过 Throwable#getCause()方法以及前面提到的“遗留方法”访问** @author  Frank Yellin* @since   1.1*/
public class ExceptionInInitializerError extends LinkageError {/*** Use serialVersionUID from JDK 1.1.X for interoperability*/private static final long serialVersionUID = 1521711792217232256L;/*** This field holds the exception if the* ExceptionInInitializerError(Throwable thrown) constructor was* used to instantiate the object** @serial**/private Throwable exception;/*** Constructs an <code>ExceptionInInitializerError</code> with* <code>null</code> as its detail message string and with no saved* throwable object.* A detail message is a String that describes this particular exception.*/public ExceptionInInitializerError() {initCause(null);  // Disallow subsequent initCause}/*** Constructs a new <code>ExceptionInInitializerError</code> class by* saving a reference to the <code>Throwable</code> object thrown for* later retrieval by the {@link #getException()} method. The detail* message string is set to <code>null</code>.** @param thrown The exception thrown*/public ExceptionInInitializerError(Throwable thrown) {initCause(null);  // Disallow subsequent initCausethis.exception = thrown;}/*** Constructs an ExceptionInInitializerError with the specified detail* message string.  A detail message is a String that describes this* particular exception. The detail message string is saved for later* retrieval by the {@link Throwable#getMessage()} method. There is no* saved throwable object.*** @param s the detail message*/public ExceptionInInitializerError(String s) {super(s);initCause(null);  // Disallow subsequent initCause}/*** Returns the exception that occurred during a static initialization that* caused this error to be created.** <p>This method predates the general-purpose exception chaining facility.* The {@link Throwable#getCause()} method is now the preferred means of* obtaining this information.** @return the saved throwable object of this*         <code>ExceptionInInitializerError</code>, or <code>null</code>*         if this <code>ExceptionInInitializerError</code> has no saved*         throwable object.*/public Throwable getException() {return exception;}/*** Returns the cause of this error (the exception that occurred* during a static initialization that caused this error to be created).** @return  the cause of this error or <code>null</code> if the*          cause is nonexistent or unknown.* @since   1.4*/public Throwable getCause() {return exception;}
}

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