Java know how much (52) built-in exceptions

In standard package Java.lang, Java defines a number of exception classes. Some of the previous examples have been used. These exceptions are generally subclasses of the standard class runtimeexception. Since Java.lang is actually introduced by all Java programs, most exceptions derived from RuntimeException are automatically available. Furthermore, they do not need to be included in the throws list of any method. In the Java language, this is called an unchecked exception (unchecked exceptions). Because the compiler does not check it to see if a method handles or throws these exceptions. The unchecked exceptions defined in Java.lang are listed in table 10-1. Table 10-2 lists the exceptions defined by Java.lang that must be included in the throws list of methods if they can produce an exception but cannot handle it on their own. These are called checked exceptions (checked exceptions). Java defines several other exception types that are related to non-homogeneous libraries.

table 10-1 Non-checked exception subclasses defined in Java Java.lang

Exception	Description
ArithmeticException	Arithmetic errors, such as being removed by 0
ArrayIndexOutOfBoundsException	Array subscript out of bounds
Arraystoreexception	Array element assignment type is incompatible
ClassCastException	Illegal cast type
IllegalArgumentException	Invalid argument for calling method
Illegalmonitorstateexception	Illegal monitoring of operations, such as waiting for an unlocked thread
IllegalStateException	The environment or application status is incorrect
Illegalthreadstateexception	The request operation is incompatible with the current thread state
Indexoutofboundsexception	Some types of indexes are out of bounds
NullPointerException	Illegal use of NULL references
NumberFormatException	String to number format illegal conversion
SecurityException	Attempting to violate security
Stringindexoutofbounds	Attempting to index outside the bounds of a string
Unsupportedoperationexception	An unsupported operation was encountered

Table 10-2 Check exceptions defined in Java.lang

Exception	meaning
ClassNotFoundException	The class could not be found
Clonenotsupportedexception	Attempting to clone an object that cannot implement the Cloneable interface
Illegalaccessexception	Access to a class is denied
Instantiationexception	An object that attempts to create an abstract class or an abstract interface
Interruptedexception	One thread is interrupted by another thread
Nosuchfieldexception	The requested field does not exist
Nosuchmethodexception	The requested method does not exist

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