Java 中的类 getDeclaredMethod()方法，带示例
原文:https://www . geesforgeks . org/class-getdeclaredmethod-method-in-Java-with-examples/
java.lang.Class 类 的 getDeclaredMethod() 方法用于获取该类的具有指定参数类型的指定方法。方法以方法对象的形式返回此类的指定方法。
语法:
public Method getDeclaredMethod(String methodName,
Class[] parameterType)
throws NoSuchMethodException, SecurityException
参数:该方法接受两个参数:
- 方法名称是要获取的方法。
- 参数类型是指定方法的参数类型数组。
返回值:该方法以 method 对象的形式返回该类的指定方法。
异常此方法抛出:
- 如果找不到具有指定名称的方法，则 NoSuchMethodException 。
- 空指针异常如果名称为空
-
SecurityException if a security manager is present and the security conditions are not met.
下面的程序演示了 getDeclaredMethod()方法。
例 1:
```java // Java program to demonstrate // getDeclaredMethod() method
import java.util.*;
public class Test {
public void func() {}
public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException {
// returns the Class object for this class Class myClass = Class.forName("Test");
System.out.println("Class represented by myClass: " + myClass.toString());
String methodName = "func"; Class[] parameterType = null;
// Get the method of myClass // using getDeclaredMethod() method System.out.println( methodName + " Method of myClass: " + myClass.getDeclaredMethod( methodName, parameterType)); } } ```
Output:
```java Class represented by myClass: class Test func Method of myClass: public void Test.func()
```
例 2:
```java // Java program to demonstrate // getDeclaredMethod() method
import java.util.*;
class Main {
private void func() {}
public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException { // returns the Class object for this class Class myClass = Class.forName("Main");
System.out.println("Class represented by myClass: " + myClass.toString());
String methodName = "func"; Class[] parameterType = null;
try { // Get the method of myClass // using getDeclaredMethod() method System.out.println( methodName + " Method of myClass: " + myClass.getDeclaredMethod( methodName, parameterType)); } catch (Exception e) { System.out.println(e); } } } ```
Output:
```java Class represented by myClass: class Main func Method of myClass: private void Main.func()
```
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