類的類getDeclaredMethod()方法 (Class class getDeclaredMethod() method)

• getDeclaredMethod() method is available in java.lang package.

  getDeclaredMethod()方法在java.lang包中可用。

• getDeclaredMethod() method is used to return Method objects that indicate the given declared method of the class or an interface denoted by this Class object.

  getDeclaredMethod()方法用于返回Method對象，這些對象指示給定的類的聲明方法或由此Class對象表示的接口。

• getDeclaredMethod() method is a non-static method, it is accessible with the class objects only and if we try to access the method with the class name then we will get an error.

  getDeclaredMethod()方法是一個非靜態方法，只能使用類對象進行訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• getDeclaredMethod() method accepts two arguments, the first argument is of "String" type and the second argument is an array of "Class" type.

  getDeclaredMethod()方法接受兩個參數，第一個參數為“字符串”類型，第二個參數為“類”類型的數組。

• getDeclaredMethod() method may throw an exception at the time of returning a Method object.

  getDeclaredMethod()方法在返回Method對象時可能會引發異常。

  • NoSuchMethodException: In this exception when a specifying method does not exist.NoSuchMethodException ：在此異常中，當指定方法不存在時。
  • SecurityException: In this exception, it may raise when the security manager exists.SecurityException ：在此異常中，當安全管理器存在時可能會引發此異常。
  • NullPointerException: In this exception when the given Method name is null.NullPointerException ：在此異常中，當給定的Method名稱為null時。

Syntax:

句法：

public Method getDeclaredMethod (String method_name, Class ...paramType);

Parameter(s):

參數：

• String method_name – represents the name of the method.

  字符串method_name –表示方法的名稱。

• Class ...paramType – represents the parameter array of "Class" type.

  Class ... paramType –表示“類”類型的參數數組。

Return value:

返回值：

The return type of this method is Method, it returns the Method object for the method of this Class meets the given method_name and parameter array paramType.

該方法的返回類型為Method ，它返回該Class方法滿足給定method_name和參數數組paramType的Method對象。

Example:

例：

// Java program to demonstrate the example of Method // getDeclaredMethod (String method_name, Class ...paramType) // method of Class import java.lang.reflect.*;public class GetDeclaredMethodOfClass {public static void main(String[] args) throws Exception {String str = new String();GetDeclaredMethodOfClass dc = new GetDeclaredMethodOfClass();// Get Class object of StringClass cl = str.getClass();// Get Class object of GetDeclaredMethodOfClassClass dm = dc.getClass();// Calling No argument MethodMethod no_argument_method = cl.getDeclaredMethod("length", null);System.out.println(" String Method = " + no_argument_method.toString());Class[] method_arguments = new Class[2];method_arguments[0] = Integer.class;method_arguments[1] = Float.class;// Calling argument MethodMethod argument_method = dm.getDeclaredMethod("argumentMethod", method_arguments);System.out.println("This Class Method = " + argument_method.toString());}public void argumentMethod(Integer i, Float f) {this.i = i;this.f = f;}public int i = 10;private float f = 10.2f; }

Output

輸出量

String Method = public int java.lang.String.length() This Class Method = public void GetDeclaredMethodOfClass.argumentMethod(java.lang.Integer,java.lang.Float)

翻譯自: https://www.includehelp.com/java/class-class-getdeclaredmethod-method-with-example.aspx

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