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Java Platform 1.2 Beta 4 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.lang.reflect.AccessibleObject | +--java.lang.reflect.Constructor
Constructor permits widening conversions to occur when matching the actual parameters to newInstance() with the underlying constructor's formal parameters, but throws an IllegalArgumentException if a narrowing conversion would occur.
Member
,
Class
,
Class.getConstructors()
,
java.lang.Class#getConstructor()
,
Class.getDeclaredConstructors()
Method Summary | |
boolean | equals(Object obj)
Compares this Constructor against the specified object. |
Class | getDeclaringClass()
Returns the Class object representing the class that declares the constructor represented by this Constructor object. |
Class[] | getExceptionTypes()
Returns an array of Class objects that represent the types of the checked exceptions thrown by the underlying constructor represented by this Constructor object. |
int | getModifiers()
Returns the Java language modifiers for the constructor represented by this Constructor object, as an integer. |
String | getName()
Returns the name of this constructor, as a string. |
Class[] | getParameterTypes()
Returns an array of Class objects that represent the formal parameter types, in declaration order, of the constructor represented by this Constructor object. |
int | hashCode()
Returns a hashcode for this Constructor. |
Object | newInstance(Object[] initargs)
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters. |
String | toString()
Return a string describing this Constructor. |
Methods inherited from class java.lang.reflect.AccessibleObject | |
isAccessible , setAccessible , setAccessible |
Methods inherited from class java.lang.Object | |
clone , finalize , getClass , notify , notifyAll , wait , wait , wait |
Method Detail |
public Class getDeclaringClass()
public String getName()
public int getModifiers()
Modifier
public Class[] getParameterTypes()
public Class[] getExceptionTypes()
public boolean equals(Object obj)
public int hashCode()
public String toString()
public java.util.Hashtable(int,float)
The only possible modifiers for constructors are the access modifiers public, protected or private. Only one of these may appear, or none if the constructor has default (package) access.
public Object newInstance(Object[] initargs) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException
Creation proceeds with the following steps, in order:
If the class that declares the underlying constructor represents an abstract class, the creation throws an InstantiationException.
If this Constructor object enforces Java language access control and the underlying constructor is inaccessible, the creation throws an IllegalAccessException.
If the number of actual parameters supplied via initargs is different from the number of formal parameters required by the underlying constructor, the creation throws an IllegalArgumentException.
A new instance of the constructor's declaring class is created, and its fields are initialized to their default initial values.
For each actual parameter in the supplied initargs array:
If the corresponding formal parameter has a primitive type, an unwrapping conversion is attempted to convert the object value to a value of the primitive type. If this attempt fails, the creation throws an IllegalArgumentException.
If, after possible unwrapping, the parameter value cannot be converted to the corresponding formal parameter type by an identity or widening conversion, the creation throws an IllegalArgumentException.
Control transfers to the underlying constructor to initialize the new instance. If the constructor completes abruptly by throwing an exception, the exception is placed in an InvocationTargetException and thrown in turn to the caller of newInstance.
If the constructor completes normally, returns the newly created and initialized instance.
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Java Platform 1.2 Beta 4 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |