Java类类getConstructor（）方法及示例

类的类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()方法用于返回一个Constructor对象，该对象反映此Class对象表示的类的给定公共构造方法。

• 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()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  返回一个Constructor对象时， getConstructor()方法可能会引发异常。

  • NoSuchMethodException: In this exception when a specifying method does not exist.NoSuchMethodException ：在此异常中，当指定方法不存在时。
  • SecurityException: In this exception, it may raise when the security manager exists.SecurityException ：在此异常中，当安全管理器存在时可能会引发此异常。

Syntax:

句法：

public Constructor getConstructor (Class ...paramType);

Parameter(s):

参数：

• Class ...paramType – represents the parameter array.

  Class ... paramType –表示参数数组。

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.

此方法的返回类型为Constructor ，它返回满足给定参数类型的公共构造方法的Constructor对象。

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 type
Class[] cl = new Class[] {
String.class
};
// It return the Constructor object that denotes
// the public Constructor of the class denoted by
// the Class object
Constructor con = String.class.getConstructor(cl);
// Display public Constructor of String Class
System.out.println("Constructor of the Class: " + con);
}
}

Output

输出量

Constructor of the Class: public java.lang.String(java.lang.String)

翻译自: https://www.includehelp.com/java/class-class-getconstructor-method-with-example.aspx