java.lang.Exception
An exception is an event, which occurs during the execution of a program that disrupts the normal flow of the program's instructions.
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| Exception hierarchy |
The class Exception and its subclasses are a form of Throwable.
All the subclass of Exception class (except Sub class of RuntimeException) are called checked exceptions.
Checked exceptions need to be declared in a method or constructor'sthrows clause if they can be thrown by the execution of the method or constructor and propagate outside the method or constructor boundary.
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| Complete Hierarchy |
Exception extends Throwable
public class Exception extends Throwable {
static final long serialVersionUID = -3387516993124229948L;
public Exception() {
super();
}
public Exception(String message) {
super(message);
}
public Exception(String message, Throwable cause) {
super(message, cause);
}
public Exception(Throwable cause) {
super(cause);
}
protected Exception(String message, Throwable cause, boolean enableSuppression,
boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}
Unchecked Exception extends RuntimeException
package java.lang;
public class NullPointerException extends RuntimeException {
private static final long serialVersionUID = 5162710183389028792L;
public NullPointerException() {
super();
}
public NullPointerException(String s) {
super(s);
}
}
Checked Exception extends Exception
public class SQLException extends Exception implements Iterable<Throwable> {
public SQLException(String reason, String SQLState, int vendorCode) {
super(reason);
this.SQLState = SQLState;
this.vendorCode = vendorCode;
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
DriverManager.println("SQLState("+SQLState+
") vendor code(" + vendorCode + ")");
printStackTrace(DriverManager.getLogWriter());
}
}
}
public SQLException(String reason, String SQLState) {
super(reason);
this.SQLState = SQLState;
this.vendorCode = 0;
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
DriverManager.println("SQLException:SQLState("+SQLState+")");
}
}
}
public SQLException(String reason) {
super(reason);
this.SQLState = null;
this.vendorCode = 0;
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
}
}
}
public SQLException() {
super();
this.SQLState = null;
this.vendorCode = 0;
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
}
}
}
public SQLException(Throwable cause) {
super(cause);
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
}
}
}
public SQLException(String reason, Throwable cause) {
super(reason,cause);
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
}
}
}
public SQLException(String reason, String sqlState, Throwable cause) {
super(reason,cause);
this.SQLState = sqlState;
this.vendorCode = 0;
if (!(this instanceof SQLWarning)) {
if (DriverManager.getLogWriter() != null) {
printStackTrace(DriverManager.getLogWriter());
DriverManager.println("SQLState(" + SQLState + ")");
}
}
}
private static final long serialVersionUID = 2135244094396331484L;
}
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