Java类类getConstructor()方法及示例
類的類getConstructor()方法 (Class class getConstructor() method)
getConstructor() method is available in java.lang package.
getConstructor()方法在java.lang包中可用。
getConstructor() method is used to return a Constructor object that reflects the given public constructor of the class denoted by this Class object.
getConstructor()方法用于返回一個Constructor對象,該對象反映此Class對象表示的類的給定公共構造方法。
getConstructor() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
getConstructor()方法是一個非靜態方法,只能通過類對象訪問,如果嘗試使用類名稱訪問該方法,則會收到錯誤消息。
getConstructor() method may throw an exception at the time of returning a Constructor object.
返回一個Constructor對象時, getConstructor()方法可能會引發異常。
- 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。
Syntax:
句法:
public Constructor getConstructor (Class ...paramType);Parameter(s):
參數:
Class ...paramType – represents the parameter array.
Class ... paramType –表示參數數組。
Return value:
返回值:
The return type of this method is Constructor, it returns Constructor object of the public constructor that meets the given parameter types.
此方法的返回類型為Constructor ,它返回滿足給定參數類型的公共構造方法的Constructor對象。
Example:
例:
// Java program to demonstrate the example // of Constructor getConstructor (Class ...paramType) method of Class import java.lang.reflect.*;public class GetConstructorOfClass {public static void main(String[] args) throws Exception {// Creating an array of Class typeClass[] cl = new Class[] {String.class};// It return the Constructor object that denotes// the public Constructor of the class denoted by// the Class objectConstructor con = String.class.getConstructor(cl);// Display public Constructor of String ClassSystem.out.println("Constructor of the Class: " + con);} }Output
輸出量
Constructor of the Class: public java.lang.String(java.lang.String)翻譯自: https://www.includehelp.com/java/class-class-getconstructor-method-with-example.aspx
總結
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