java 中的 java.lang.reflect.Parameter 类
原文:https://www . geesforgeks . org/Java-lang-reflect-parameter-class-in-Java/
java.lang.reflect.Parameter 类提供了关于方法参数的信息，包括它们的名称和修饰符。它还提供了获取参数属性的替代方法。
parameter 类的一些有用的方法有:
- Public GetModifiers (): It returns the modifier flag of the Parameter represented by this parameter object.
- Public string getName (): Returns the name of the method parameter.
- Public getParameterizedType (): Returns the type of the parameter.
java.lang.reflect.Parameter 类的所有方法如下:
| way | describe | | --- | --- | | 等于(对象对象) | Compare based on executable file and index. | | [获取注释类型（）](https://www.geeksforgeeks.org/field-getannotatedtype-method-in-java-with-examples/) | Returns an AnnotatedType object, which represents that a type is used to specify the type of formal parameter represented by the parameter. | | getAnnotation(类注释类) | Returns the comment of this element of the specified type, or null if such comment exists. | | [getAnnotations()](https://www.geeksforgeeks.org/class-getannotations-method-in-java-with-examples/) | Returns the comments that exist on this element. | | getAnnotationsByType(类)注释类) | Returns the comment associated with this element. | | getDeclaredAnnotations() | Returns the comment that appears directly on this element. | | getdeclaredannotation(类)annotation class) | Returns the comment of this element of the specified type, or null if such comment exists directly. | | getdeclaringxecutable() | Returns the executable file that declares this parameter. | | getdeclaredannotationbytype(类) annotationClass) | If the comment of the specified type exists directly or indirectly, the comment of the element is returned. | | [get coders()](https://www.geeksforgeeks.org/method-class-getmodifiers-method-in-java/) | Gets the modifier flag of this parameter represented by this parameter object. | | [获取名称（）](https://www.geeksforgeeks.org/file-getname-method-in-java-with-examples/) | Returns the name of the parameter. | | getparameterzedtype() | Returns a Type object that identifies the parameterized type of the parameter represented by the parameter object. | | [getType()](https://www.geeksforgeeks.org/field-gettype-method-in-java-with-examples/) | Returns a Class object that identifies the declaration type of the parameter represented by the parameter object. | | [hashCode()](https://www.geeksforgeeks.org/equals-hashcode-methods-java/) | Returns the hash code according to the hash code and index of the executable file. | | [Isimplicit](https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Parameter.html#isImplicit--)() | Returns true if the parameter is implicitly declared in the source code, otherwise returns false. | | [是名称÷](https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Parameter.html#isNamePresent--)() | Returns true if the parameter has a name. | | issynamic() | If a parameter is neither implicitly nor explicitly declared else false | | [返回真T3】](https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Parameter.html#toString--) |示例:
Java
// Java program to illustrate Parameter class of
// java.lang.reflect package
// Importing java.lang.reflect package to
// obtain reflective information about classes and objects
import java.lang.reflect.*;
// Class 1
// Helper class
class Calculate {
// Function 1
// To add to numbers
int add(int a, int b)
{
// Returning the sum
return (a + b);
}
// Function 2
// To multiply two numbers
int mul(int a, int b)
{
// Returning the number obtained
// after multiplying numbers
return (b * a);
}
// Function 3
// Substracting two numbers
long subtract(long a, long b)
{
// Return the numbers after substracting
// second number from the first number
return (a - b);
}
}
// Class 2
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating object of helper class
// in the main method
Class cls = Calculate.class;
// Getting all the methods of
// a particular class
Method[] methods = cls.getDeclaredMethods();
// Iterating over each method
// using the for each loop
for (Method method : methods) {
// Print and display the method name
// using getName() method
System.out.print(
"Method Name: " + method.getName() + " ");
// Getting all the parameters of
// a particular method
Parameter parameters[] = method.getParameters();
// Print and display
System.out.println("\nparameters of "
+ method.getName()
+ "() methods: ");
// Iterating over parameters
// using for each loop
for (Parameter parameter : parameters) {
// Display the type of parameters
System.out.print(
parameter.getParameterizedType() + " ");
// Print the parameters of method
System.out.print(parameter.getName() + " ");
}
// New line
System.out.print("\n\n");
}
}
}
输出
Method Name: subtract
parameters of subtract() methods:
long arg0 long arg1
Method Name: add
parameters of add() methods:
int arg0 int arg1
Method Name: mul
parameters of mul() methods:
int arg0 int arg1
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