類類forName()方法 (Class class forName() method)

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

  forName()方法在java.lang包中可用。

• forName() method is used to return the class object for the Class with the given class_name.

  forName()方法用于返回具有給定class_name的Class的類對(duì)象。

• forName() method is a static method, it is accessible with the class name and if we try to access the method with the class object then we will not get any error.

  forName()方法是一個(gè)靜態(tài)方法，可以使用類名進(jìn)行訪問，如果嘗試使用類對(duì)象訪問該方法，則不會(huì)出現(xiàn)任何錯(cuò)誤。

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

  forName()方法在返回Class對(duì)象時(shí)可能會(huì)引發(fā)異常。

  • LinkageError: This exception may throw when we get linking error.LinkageError ：當(dāng)我們獲得鏈接錯(cuò)誤時(shí)，可能會(huì)拋出此異常。
  • ExceptionInInitializeError: In this exception when the initialization is done by this method fails.ExceptionInInitializeError ：在此方法中，初始化失敗的此異常。
  • ClassNotFoundException: In this exception when the given class does not exist.ClassNotFoundException ：如果給定的類不存在，則在此異常中。

Syntax:

句法：

public static Class forName(String class_name);

Parameter(s):

參數(shù)：

• String class_name – represents the fully qualified name of the given class.

  字符串class_name –代表給定類的完全限定名稱。

Return value:

返回值：

The return type of this method is Class, it returns this Class object for the class with the given name.

該方法的返回類型為Class ，它將為具有給定名稱的類返回此Class對(duì)象。

Example:

例：

// Java program to demonstrate the example // of Class forName (String class_name) method of Class public class ForNameOfClass {public static void main(String[] args) throws Exception {// It returns the Class 'java.lang.Object' object for the class // with the given class nameClass cl = Class.forName("java.lang.Object");// Display Name, Package and InterfacesSystem.out.print("Class 'java.lang.Object' Name: ");System.out.println(cl.getName());System.out.print("Class 'java.lang.Object' Package: ");System.out.println(cl.getPackage());System.out.print("Class 'java.lang.Object' Interface: ");System.out.println(cl.getInterfaces());} }

Output

輸出量

Class 'java.lang.Object' Name: java.lang.Object Class 'java.lang.Object' Package: package java.lang Class 'java.lang.Object' Interface: [Ljava.lang.Class;@68f7aae2

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

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