类类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()方法用于返回具有给定class_name的Class的类对象。

• 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()方法是一个静态方法，可以使用类名进行访问，如果尝试使用类对象访问该方法，则不会出现任何错误。

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

  forName()方法在返回Class对象时可能会引发异常。

  • LinkageError: This exception may throw when we get linking error.LinkageError ：当我们获得链接错误时，可能会抛出此异常。
  • ExceptionInInitializeError: In this exception when the initialization is done by this method fails.ExceptionInInitializeError ：在此方法中，初始化失败的此异常。
  • ClassNotFoundException: In this exception when the given class does not exist.ClassNotFoundException ：如果给定的类不存在，则在此异常中。

Syntax:

句法：

public static Class forName(String class_name);

Parameter(s):

参数：

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

  字符串class_name –代表给定类的完全限定名称。

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.

该方法的返回类型为Class ，它将为具有给定名称的类返回此Class对象。

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 name        Class cl = Class.forName("java.lang.Object");        // Display Name, Package and Interfaces        System.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

输出量

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

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