Java Class isInterface()用法及代碼示例

java.lang.Class類的isInterface()方法用於檢查此Class是否是接口。如果此類是接口，則該方法返回true。否則返回false。

用法:

public boolean isInterface()

參數：此方法不接受任何參數。

返回值：如果此Class是接口，則此方法返回true。否則返回false。

下麵的程序演示了isInterface()方法。

示例1:

// Java program to demonstrate isInterface() method 
  
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()); 
  
        // Check if this class is an interface 
        // using isInterface() method 
        System.out.println("Is Test an interface: "
                           + myClass.isInterface()); 
    } 
}

輸出：

Class represented by myClass: class Test
Is Test an interface: false

示例2:

// Java program to demonstrate isInterface() method 
  
interface T { 
} 
  
public class Test { 
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
  
        // returns the Class object for this class 
        Class myClass = Class.forName("T"); 
  
        // Check if T is an interface 
        // using isInterface() method 
        System.out.println("Is T an interface: "
                           + myClass.isInterface()); 
    } 
}

輸出：

Is T an interface: true

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

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