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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.Method
A Method permits widening conversions to occur when matching the actual parameters to invokewith the underlying method's formal parameters, but it throws an IllegalArgumentException if a narrowing conversion would occur.
Member
,
Class
,
Class.getMethods()
,
java.lang.Class#getMethod()
,
Class.getDeclaredMethods()
,
java.lang.Class#getDeclaredMethod()
Method Summary | |
boolean | equals(Object obj)
Compares this Method against the specified object. |
Class | getDeclaringClass()
Returns the Class object representing the class or interface that declares the method represented by this Method object. |
Class[] | getExceptionTypes()
Returns an array of Class objects that represent the types of the checked exceptions thrown by the underlying method represented by this Method object. |
int | getModifiers()
Returns the Java language modifiers for the method represented by this Method object, as an integer. |
String | getName()
Returns the name of the method represented by this Method object, as a String. |
Class[] | getParameterTypes()
Returns an array of Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object. |
Class | getReturnType()
Returns a Class object that represents the formal return type of the method represented by this Method object. |
int | hashCode()
Returns a hashcode for this Method. |
Object | invoke(Object obj,
Object[] args)
Invokes the underlying method represented by this Method object, on the specified object with the specified parameters. |
String | toString()
Returns a string describing this Method. |
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 getReturnType()
public Class[] getParameterTypes()
public Class[] getExceptionTypes()
public boolean equals(Object obj)
public int hashCode()
public String toString()
public boolean java.lang.Object.equals(java.lang.Object)
The access modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: abstract, static, final, synchronized native.
public Object invoke(Object obj, Object[] args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException
Method invocation proceeds with the following steps, in order:
If the underlying method is static, then the specified object argument is ignored. It may be null.
Otherwise, the method is an instance method. If the specified object argument is null, the invocation throws a NullPointerException. Otherwise, if the specified object argument is not an instance of the class or interface declaring the underlying method, the invocation throws an IllegalArgumentException.
If this Method object enforces Java language access control and the underlying method is inaccessible, the invocation throws an IllegalAccessException.
If the number of actual parameters supplied via args is different from the number of formal parameters required by the underlying method, the invocation throws an IllegalArgumentException.
For each actual parameter in the supplied args array:
If the corresponding formal parameter has a primitive type, an unwrapping conversion is attempted to convert the object value to a value of a primitive type. If this attempt fails, the invocation 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 invocation throws an IllegalArgumentException.
If the underlying method is an instance method, it is invoked using dynamic method lookup as documented in The Java Language Specification, section 15.11.4.4; in particular, overriding based on the runtime type of the target object will occur.
If the underlying method is static, it is invoked as exactly the method on the declaring class.
Control transfers to the underlying method. If the method completes abruptly by throwing an exception, the exception is placed in an InvocationTargetException and thrown in turn to the caller of invoke.
If the method completes normally, the value it returns is returned to the caller of invoke; if the value has a primitive type, it is first appropriately wrapped in an object. If the underlying method return type is void, the invocation returns null.
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Java Platform 1.2 Beta 4 |
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