java.lang
Class Throwable
java.lang.Object
|
+--java.lang.Throwable
- Direct Known Subclasses:
- Error, Exception
- public class Throwable
- extends Object
The Throwable
class is the superclass of all errors
and exceptions in the Java language. Only objects that are
instances of this class (or of one of its subclasses) are thrown
by the Java Virtual Machine or can be thrown by the Java
throw
statement. Similarly, only this class or one of
its subclasses can be the argument type in a catch
clause.
A Throwable
class contains a snapshot of the
execution stack of its thread at the time it was created. It can
also contain a message string that gives more information about
the error.
Here is one example of catching an exception:
try {
int a[] = new int[2];
a[4];
} catch (IndexOutOfBoundsException e) {
System.out.println("exception: " + e.getMessage());
e.printStackTrace();
}
- Since:
- JDK1.0
Constructor Summary |
Throwable()
Constructs a new Throwable with no detail message. |
Throwable(String message)
Constructs a new Throwable with the specified detail
message. |
Method Summary |
String |
getMessage()
Returns the detail message of this throwable object. |
String |
toString()
Returns a short description of this throwable object. |
Throwable
public Throwable()
- Constructs a new
Throwable
with no detail message.
The stack trace is automatically filled in.
- Since:
- JDK1.0
Throwable
public Throwable(String message)
- Constructs a new
Throwable
with the specified detail
message. The stack trace is automatically filled in.
- Parameters:
message
- the detail message.- Since:
- JDK1.0
getMessage
public String getMessage()
- Returns the detail message of this throwable object.
- Returns:
- the detail message of this
Throwable
,
or null
if this Throwable
does not
have a detail message. - Since:
- JDK1.0
toString
public String toString()
- Returns a short description of this throwable object.
- Overrides:
- toString in class Object
- Returns:
- a string representation of this
Throwable
. - Since:
- JDK1.0