📜  Java中的类 getComponentType() 方法和示例

📅  最后修改于: 2022-05-13 01:55:22.573000             🧑  作者: Mango

Java中的类 getComponentType() 方法和示例

Java.lang.Class 类getComponentType()方法用于获取表示数组的组件类型的Class,如果该类代表一个。否则返回 null。
句法:

public Class getComponentType()

参数:此方法不接受任何参数。
返回值:如果该类表示一个,则该方法返回表示数组的组件类型的。否则返回 null。
下面的程序演示了 getComponentType() 方法。
示例 1:

Java
// Java program to demonstrate getComponentType() 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 type of interfaces of myClass
        // using getComponentType() method
        System.out.println("ComponentType of myClass: "
                           + myClass.getComponentType());
    }
}


Java
// Java program to demonstrate getComponentType() method
 
import java.util.*;
 
public class Test {
 
    public static void main(String[] args)
        throws ClassNotFoundException
    {
 
        int[] Arr = new int[5];
 
        // returns the Class object
        Class arrClass = Arr.getClass();
 
        // Get the ComponentType of arrClass
        // using getComponentType() method
        System.out.println("ComponentType of myClass: "
                           + arrClass.getComponentType());
    }
}


输出:
Class represented by myClass: class Test
ComponentType of myClass: null

示例 2:

Java

// Java program to demonstrate getComponentType() method
 
import java.util.*;
 
public class Test {
 
    public static void main(String[] args)
        throws ClassNotFoundException
    {
 
        int[] Arr = new int[5];
 
        // returns the Class object
        Class arrClass = Arr.getClass();
 
        // Get the ComponentType of arrClass
        // using getComponentType() method
        System.out.println("ComponentType of myClass: "
                           + arrClass.getComponentType());
    }
}
输出:
ComponentType of myClass: int

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