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Java Class getDeclaredMethods()用法及代码示例


java.lang.Class类的getDeclaredMethods()方法用于获取此类的方法,这些方法是私有,公共,受保护或默认的方法,及其成员或其成员类和接口的成员,但不是继承的方法方法。该方法以Method对象数组的形式返回此类的方法。

用法:

public Method[] getDeclaredMethods()
               throws SecurityException

参数:此方法不接受任何参数。


返回值:此方法以Method对象数组的形式返回此类的方法。

异常如果存在安全管理器且不满足安全条件,则此方法将引发SecurityException。

下面的程序演示了getDeclaredMethods()方法。

示例1:

// Java 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())); 
    } 
}
输出:

Class represented by myClass: class Test
DeclaredMethods of myClass: [public static void Test.main(java.lang.String[]) throws java.lang.ClassNotFoundException]

示例2:

// 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:

Class represented by myClass: class Main
DeclaredMethods of myClass: [public static void Main.main(java.lang.String[]) throws java.lang.ClassNotFoundException, private void Main.function()]

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



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注:本文由纯净天空筛选整理自srinam大神的英文原创作品 Class getDeclaredMethods() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。