Java中的类 getPackageName() 方法和示例
Java.lang.Class 类的getPackageName()方法用于获取该实体的包名。该实体可以是类、数组、接口等。该方法以字符串形式返回该实体的包名。
句法:
public String getPackageName()
参数:此方法不接受任何参数。
返回值:该方法以字符串形式返回该实体的包名。
下面的程序演示了 getPackageName() 方法。
注意:此方法是在Java 9 中引入的。因此,要运行此方法,我们需要一个带有Java 9 的编译器。所以这不会在在线 IDE 中运行。
示例 1:
Java
// Java program to demonstrate getPackageName() method
public class Test {
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Class.forName("Test");
System.out.println("Class represented by myClass: "
+ myClass.toString());
// Get the package name of myClass
// using getPackageName() method
System.out.println("PackageName of myClass: "
+ myClass.getPackageName());
}
}
Java
// Java program to demonstrate getPackageName() method
public class Test {
class Arr {
}
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object
Class myClass = Class.forName("java.lang.String");
// Get the package name of myClass
// using getPackageName() method
System.out.println("PackageName of myClass: "
+ myClass.getPackageName());
}
}
输出:
Class represented by myClass: class Test
PackageName of myClass:
示例 2:
Java
// Java program to demonstrate getPackageName() method
public class Test {
class Arr {
}
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object
Class myClass = Class.forName("java.lang.String");
// Get the package name of myClass
// using getPackageName() method
System.out.println("PackageName of myClass: "
+ myClass.getPackageName());
}
}
输出:
Class represented by myClass: class java.lang.String
PackageName of myClass: java.lang
参考: https://docs.oracle.com/javase/9/docs/api/ Java/lang/Class.html#getPackageName–