Java Modifier isAbstract(mod)用法及代碼示例

java.lang.reflect.Modifier的isAbstract(mod)方法用於檢查整數參數是否包含abstract修飾符。如果此整數參數表示抽象類型Modifier，則方法返回true，否則返回false。

用法:

public static boolean isAbstract(int mod)

參數：此方法接受整數名稱，因為mod代表一組修飾符。

返回：如果mod包含abstract修飾符，則此方法返回true；否則，此方法返回true。否則為假。

以下示例程序旨在說明isAbstract()方法：
示例1:

// Java program to illustrate isAbstract() method 
  
import java.lang.reflect.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // get Method class object 
        Method[] methods 
            = Shape.class.getMethods(); 
  
        // get Modifier Integer value 
        int mod = methods[0].getModifiers(); 
  
        // check Modifier is Abstract or not 
        boolean result = Modifier.isAbstract(mod); 
  
        System.out.println("Mod integer value "
                           + mod + " is Abstract : "
                           + result); 
    } 
  
    abstract class Shape { 
  
        public abstract String drawShape(); 
    } 
}

輸出：

Mod integer value 1025 is Abstract : true

示例2:

// Java program to illustrate isAbstract() 
  
import java.lang.reflect.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // get Method class object 
        Method[] methods = Numbers.class.getMethods(); 
  
        // get Modifier Integer value 
        int mod1 = methods[0].getModifiers(); 
        int mod2 = methods[1].getModifiers(); 
  
        // check Modifiers are Abstract or not 
        boolean result1 = Modifier.isAbstract(mod1); 
        boolean result2 = Modifier.isAbstract(mod2); 
  
        // print results 
        System.out.println("Mod integer value "
                           + mod1 + " for method "
                           + methods[0].getName() 
                           + " is Abstract : "
                           + result1); 
  
        System.out.println("Mod integer value "
                           + mod2 + " for method"
                           + methods[1].getName() 
                           + " is Abstract : "
                           + result2); 
    } 
  
    // sample abstract class 
    abstract class Numbers { 
  
        public abstract int initializeNumber(); 
        public final int declareNumbers() 
        { 
            return 0; 
        }; 
    } 
}

輸出：

Mod integer value 1025 for method initializeNumber is Abstract : true
Mod integer value 17 for methoddeclareNumbers is Abstract : false

參考文獻： https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Modifier.html#isAbstract(int)

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 Modifier isAbstract(mod) method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。