Java Class Cast() 方法

2025年3月21日 | 阅读 1 分钟

java Class 类的 cast() 方法将一个对象转换为由该 Class 对象表示的类或接口。

语法

参数

obj - 要转换的对象

返回值

转换后的对象，如果 obj 为 null 则返回 null

抛出

ClassCastException

示例 1

class Base {
   public Base() {
      System.out.println("Class Base ");
   }
}
class Derived extends Base {
   public static void Derived2() {
      System.out.println("Class Derived ");
   }
}
public class ClassasCastExample1 {
   public static void main(String[] args) {
      ClassasCastExample2 class1 = new ClassasCastExample2();
      Class obj = class1.getClass();      
      System.out.println(obj);  
      Base obj1 = new Base();        
      Derived obj2 = new Derived();
      Object obbj = Base.class.cast(obj1);

      System.out.println(obj1.getClass());
      System.out.println(obj2.getClass());
      System.out.println(obbj.getClass());               
   }
} 

输出

class ClassasCastExample2
class Base
class Derived
class Base

示例 2

class Base {
   public static void Display() {
      System.out.println("Class Base Display() function");
   }
}
class Derived extends Base {
   public static void Display() {
      System.out.println("Class Derived Display() function");
   }
}
public class ClassasCastExample2  {
   public static void main(String[] args) {
      ClassasCastExample2 class1 = new ClassasCastExample2();
      Class obj = class1.getClass();      
      System.out.println(obj);  

      Object obj1 = new Base();        
      Derived obj2 = new Derived();
      obj2.Display();

      Object obbj = Base.class.cast(obj1);
      System.out.println(obj1.getClass());
      System.out.println(obj2.getClass());
      System.out.println(obbj.getClass());               
   }
} 

输出

class ClassasCastExample2
Class Derived Display() function
class Base
class Derived
class Base

下一个主题Java类

Java Class Cast() 方法

语法

参数

返回值

抛出

示例 1

示例 2

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Java Class Cast() 方法

语法

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示例 1

示例 2

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