Java Class getDeclaredMethods()用法及代碼示例

java.lang.Class類的getDeclaredMethods()方法用於獲取此類的方法，這些方法是私有，公共，受保護或默認的方法，及其成員或其成員類和接口的成員，但不是繼承的方法方法。該方法以Method對象數組的形式返回此類的方法。

用法:

public Method[] getDeclaredMethods()
               throws SecurityException

參數：此方法不接受任何參數。

返回值：此方法以Method對象數組的形式返回此類的方法。

異常如果存在安全管理器且不滿足安全條件，則此方法將引發SecurityException。

下麵的程序演示了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())); 
    } 
}

輸出：

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())); 
    } 
}

輸出：

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()]

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

相關用法

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