Java Class getInterfaces()用法及代碼示例

java.lang.Class類的getInterfaces()方法用於獲取由此實體直接實現的接口。該實體可以是類或接口。該方法返回由該實體直接實現的接口數組。

用法:

public Class<T>[] getInterfaces()

參數：此方法不接受任何參數。

返回值：此方法返回由該實體直接實現的接口數組。

下麵的程序演示了getInterfaces()方法。

示例1:

// Java program to demonstrate getInterfaces() 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 interfaces of myClass 
        // using getInterfaces() method 
        System.out.println( 
            "Interfaces of myClass: "
            + Arrays.toString( 
                  myClass.getInterfaces())); 
    } 
}

輸出：

Class represented by myClass: class Test
Interfaces of myClass: []

示例2:

// Java program to demonstrate getInterfaces() method 
  
import java.util.*; 
  
interface Arr { 
} 
  
public class Test implements Arr { 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object 
        Class myClass = Class.forName("Test"); 
  
        // Get the interfaces of myClass 
        // using getInterfaces() method 
        System.out.println( 
            "Interfaces of myClass: "
            + Arrays.toString( 
                  myClass.getInterfaces())); 
    } 
}

輸出：

Interfaces of myClass: [interface Arr]

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

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