📜  Java中的类 getDeclaredMethods() 方法和示例

📅  最后修改于: 2022-05-13 01:54:22.498000             🧑  作者: Mango

Java中的类 getDeclaredMethods() 方法和示例

Java.lang.Class 类getDeclaredMethods()方法用于获取该类的方法,这些方法是private、public、protected或default及其成员或其成员类和接口的成员,但不是继承的方法。该方法以 Method 对象数组的形式返回该类的方法。
句法:

public Method[] getDeclaredMethods()
               throws SecurityException

参数:此方法不接受任何参数。
返回值:该方法以Method对象数组的形式返回该类的方法
异常如果存在安全管理器并且不满足安全条件,则此方法将引发SecurityException
下面的程序演示了 getDeclaredMethods() 方法。
示例 1:

Java
// Java program to demonstrate getDeclaredMethods() 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 methods of myClass
        // using getDeclaredMethods() method
        System.out.println(
            "DeclaredMethods of myClass: "
            + Arrays.toString(
                  myClass.getDeclaredMethods()));
    }
}


Java
// Java program to demonstrate getDeclaredMethods() method
 
import java.util.*;
 
class Main {
 
    public Object obj;
 
    private void function() {}
 
    Main()
    {
 
        class Arr {
        };
 
        obj = new 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 methods of myClass
        // using getDeclaredMethods() method
        System.out.println(
            "DeclaredMethods of myClass: "
            + Arrays.toString(
                  myClass.getDeclaredMethods()));
    }
}


输出:

myClass 代表的类:class Test
myClass 的声明方法:[public static void Test.main(Java.lang.String[]) throws Java.lang.ClassNotFoundException]

示例 2:

Java

// Java program to demonstrate getDeclaredMethods() method
 
import java.util.*;
 
class Main {
 
    public Object obj;
 
    private void function() {}
 
    Main()
    {
 
        class Arr {
        };
 
        obj = new 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 methods of myClass
        // using getDeclaredMethods() method
        System.out.println(
            "DeclaredMethods of myClass: "
            + Arrays.toString(
                  myClass.getDeclaredMethods()));
    }
}
输出:

myClass 所代表的类:class Main
myClass 的声明方法:[public static void Main.main(Java.lang.String[]) throws Java.lang.ClassNotFoundException, private void Main。函数()]

参考: https://docs.oracle.com/javase/9/docs/api/ Java/lang/Class.html#getDeclaredMethods–