Java 向下类型转换

public class Test {

public static void main(String[] args) {

Parent p = new Child();

Child child = (Child) p;//这种叫做向下类型转换，父类强转成子类，父在上、子在下，故叫做向下类型转换

child.single();

}

}

class Parent {
public void single() {
System.out.println("Parent single");
}

}

class Child extends Parent {

public void single() {
System.out.println("child single");
}

}