java 强制类型转换示例

//强制类型转换 public class CastType { public static void main(String args[]) { Father<Double> father = new Father<Double>(1.0); Child<Double, String> child = new Child<Double, String>(200.0, "中国您好"); // 试图将子类对象转换成父类，正确 if ((Father<Double>) child instanceof Father) System.out.println("子类对象转换成父亲对象."); // 试图将父类对象转换成子类，错误 try { if ((Child<Double, String>) father instanceof Child) System.out.println("父类对象转换成子亲对象."); } catch (Exception e) { System.out.println(e); System.out.println("发生异常的原因：父类对象不能强制转换成子亲对象."); } } }