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Java Class getConstructors()用法及代码示例


java.lang.Class类的getConstructors()方法用于获取此类的构造函数,这些构造函数是公共的。该方法以构造函数对象数组的形式返回此类的构造函数。

用法:

public Constructor[] getConstructors()

参数:此方法不接受任何参数。


返回值:此方法以Constructor对象数组的形式返回此类的构造函数。

异常如果存在安全管理器且不满足安全条件,则此方法将引发SecurityException。

下面的程序演示了getConstructors()方法。

示例1:

// Java program to demonstrate getConstructors() 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 constructors of myClass 
        // using getConstructors() method 
        System.out.println( 
            "Constructors of myClass: "
            + Arrays.toString( 
                  myClass.getConstructors())); 
    } 
}
输出:
Class represented by myClass: class Test
Constructors of myClass: [public Test()]

示例2:

// Java program to demonstrate getConstructors() method 
  
import java.util.*; 
  
class Main { 
  
    public Object obj; 
  
    private Main() 
    { 
  
        class Arr { 
        }; 
  
        obj = new Arr(); 
    } 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object for this class 
        Class myClass = Class.forName("Main"); 
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString()); 
  
        // Get the constructors of myClass 
        // using getConstructors() method 
        System.out.println( 
            "Constructors of myClass: "
            + Arrays.toString( 
                  myClass.getConstructors())); 
    } 
}
输出:
Class represented by myClass: class Main
Constructors of myClass: []

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



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