In the standard package java.lang, Java class defines several exceptions. The previous example was used in some of them. These abnormalities typically standard class is a subclass of RuntimeException. Since java.lang actually introduced all Java programs, most derived from RuntimeException exceptions are automatically available. Moreover, they need not be included in any of the methods throws list. Java language, this is called unchecked exceptions (unchecked exceptions). It is because the compiler does not check to see whether a process or method throws these exceptions. java.lang defined unchecked exception listed in Table 10-1. Table 10-2 lists must be included in the exception list method throws defined by java.lang, if one of these methods which can produce abnormal but it can not deal with their own. These are called by the checked exceptions (checked exceptions). Java defines several other anomalies associated with different types of libraries.
| abnormal | Explanation |
|---|---|
| ArithmeticException | Arithmetic errors such as division by 0 |
| ArrayIndexOutOfBoundsException | Under an array boundary marked |
| ArrayStoreException | Array element assignment types are incompatible |
| ClassCastException | Illegal type coercion |
| IllegalArgumentException | Parameter method call illegal |
| IllegalMonitorStateException | Illegal monitoring operation, such as waiting an unlocked thread |
| IllegalStateException | Environment or application status is incorrect |
| IllegalThreadStateException | Requested operation is not compatible with the current thread state |
| IndexOutOfBoundsException | Certain types of index out of bounds |
| NullPointerException | Illegal use of a null reference |
| NumberFormatException | Illegal string conversion to digital format |
| SecurityException | Attempt to violate security |
| StringIndexOutOfBounds | In addition to trying to index a string boundary |
| UnsupportedOperationException | Encountered an unsupported operating |
| abnormal | significance |
|---|---|
| ClassNotFoundException | Class not found |
| CloneNotSupportedException | Attempting to clone an object that can not implement the Cloneable interface |
| IllegalAccessException | Access is denied to a class |
| InstantiationException | Trying to create an abstract class object or abstract interface |
| InterruptedException | A thread is interrupted by another thread |
| NoSuchFieldException | Requested field is not present |
| NoSuchMethodException | The method requested does not exist |
VII. Multithreaded programming
1. The concept of threads
2. the Java threading model
3. The main thread
4. Create a thread
5. Create a multithreaded
6. Use isAlive () and join () of
7. thread priority
8. thread synchronization
9. communication between the threads
10. a thread deadlock
11. the thread suspend, resume and terminate