Java Class desiredAssertionStatus()用法及代碼示例

java.lang.Class類的desiredAssertionStatus()方法用於獲取此類的聲明狀態，該狀態將在調用此方法時分配給該類。該方法以布爾值的形式返回此類的斷言狀態。

用法:

public boolean desiredAssertionStatus()

參數：此方法不接受任何參數

返回值：此方法以布爾值的形式返回此類的指定斷言狀態。

下麵的程序演示了desiredAssertionStatus()方法。

範例1：

// Java program to demonstrate 
// desiredAssertionStatus() method 
  
import java.util.*; 
  
public class Test { 
  
    public Object obj; 
  
    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 Assertion Status of myClass 
        // using desiredAssertionStatus() method 
        System.out.println("Assertion Status of myClass:"
                           + myClass.desiredAssertionStatus()); 
    } 
}

輸出：

Class represented by myClass:class Test
Assertion Status of myClass:false

範例2：

// Java program to demonstrate 
// desiredAssertionStatus() method 
  
import java.util.*; 
  
class Main { 
  
    private Object obj; 
  
    public static void main(String[] args) 
        throws ClassNotFoundException, NoSuchFieldException 
    { 
  
        try { 
  
            // returns the Class object for this class 
            Class myClass = Class.forName("Main"); 
  
            System.out.println("Class represented by myClass:"
                               + myClass.toString()); 
  
            // Get the Assertion Status of myClass 
            // using desiredAssertionStatus() method 
            System.out.println("Assertion Status of myClass:"
                               + myClass.desiredAssertionStatus()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Class represented by myClass:class Main
Assertion Status of myClass:false

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

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