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Java Modifier isAbstract(mod)用法及代码示例


java.lang.reflect.Modifier的isAbstract(mod)方法用于检查整数参数是否包含abstract修饰符。如果此整数参数表示抽象类型Modifier,则方法返回true,否则返回false。

用法:

public static boolean isAbstract(int mod)

参数:此方法接受整数名称,因为mod代表一组修饰符。


返回:如果mod包含abstract修饰符,则此方法返回true;否则,此方法返回true。否则为假。

以下示例程序旨在说明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(); 
    } 
}
输出:
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; 
        }; 
    } 
}
输出:
Mod integer value 1025 for method initializeNumber is Abstract : true
Mod integer value 17 for methoddeclareNumbers is Abstract : false

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



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注:本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 Modifier isAbstract(mod) method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。