Java 中的 Class getDeclaredClasses()方法，带示例
原文:https://www . geesforgeks . org/class-getdeclaredclasses-method-in-Java-with-examples/
Java . lang . class的 getDeclaredClasses() 方法用于获取该类的类，这些类是私有的、公共的、受保护的或默认的类及其成员，而不是继承的类。方法以类对象数组的形式返回该类的类。
语法:
public Class[] getDeclaredClasses()
throws SecurityException
参数:此方法不接受任何参数。
返回值:这个方法以 class 对象数组的形式返回这个类的类。
异常如果有安全经理在场且不满足安全条件，此方法抛出安全异常。
下面的程序演示了 getDeclaredClasses()方法。
例 1:
// Java program to demonstrate
// getDeclaredClasses() method
import java.util.*;
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 classes of myClass
// using getDeclaredClasses() method
System.out.println(
"DeclaredClasses of myClass: "
+ Arrays.toString(
myClass.getDeclaredClasses()));
}
}
输出:
Class represented by myClass: class Test
DeclaredClasses of myClass: []
例 2:
// Java program to demonstrate
// getDeclaredClasses() method
import java.util.*;
class Main {
private class Arr {
};
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Class.forName("Main");
System.out.println("Class represented by myClass: "
+ myClass.toString());
// Get the classes of myClass
// using getDeclaredClasses() method
System.out.println(
"DeclaredClasses of myClass: "
+ Arrays.toString(
myClass.getDeclaredClasses()));
}
}
输出:
Class represented by myClass: class Main
DeclaredClasses of myClass: [class Main$Arr]
参考:https://docs . Oracle . com/javase/9/docs/API/Java/lang/class . html # getDeclaredClasses–
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