class SuperClass
{
public SuperClass()
{
}
public SuperClass(String s)
{
s=" ";
}
public void doSomething()
{
System.out.println("这是SuperClass输出的!");
}
}
class SubClass1 extends SuperClass
{
public void doSomething()
{
System.out.println("这是SubClass1输出的!");
}
public void doSth1()
{
System.out.println("这是doSth1输出的!");
}
}
class SubClass2 extends SuperClass
{
public void doSomething()
{
System.out.println("这是SubClass2输出的!");
}
public void doSth1()
{
System.out.println("这是doSth2输出的!");
}
}
public class testLayer
{
public static void main(String arge[])
{
SuperClass x = new SuperClass();
SuperClass y = new SubClass1();
SuperClass z = new SubClass2();
x.doSomething();
y.doSth1();
z.doSth2();
}
}
请高手改正!!谢谢!
{
public SuperClass()
{
}
public SuperClass(String s)
{
s=" ";
}
public void doSomething()
{
System.out.println("这是SuperClass输出的!");
}
}
class SubClass1 extends SuperClass
{
public void doSomething()
{
System.out.println("这是SubClass1输出的!");
}
public void doSth1()
{
System.out.println("这是doSth1输出的!");
}
}
class SubClass2 extends SuperClass
{
public void doSomething()
{
System.out.println("这是SubClass2输出的!");
}
public void doSth1()
{
System.out.println("这是doSth2输出的!");
}
}
public class testLayer
{
public static void main(String arge[])
{
SuperClass x = new SuperClass();
SuperClass y = new SubClass1();
SuperClass z = new SubClass2();
x.doSomething();
y.doSth1();
z.doSth2();
}
}
请高手改正!!谢谢!
public SuperClass() {
} public SuperClass(String s) {
s = " ";
} public void doSomething() {
System.out.println("这是SuperClass输出的!");
} public void doSth1() {
// TODO Auto-generated method stub }
}class SubClass1 extends SuperClass {
public void doSomething() {
System.out.println("这是SubClass1输出的!");
} public void doSth1() {
System.out.println("这是doSth1输出的!");
}
}class SubClass2 extends SuperClass {
public void doSomething() {
System.out.println("这是SubClass2输出的!");
} public void doSth1() {
System.out.println("这是doSth2输出的!");
}
}public class testLayer {
public static void main(String arge[]) {
SuperClass x = new SuperClass();
SuperClass y = new SubClass1();
SuperClass z = new SubClass2();
x.doSomething();
y.doSomething();
z.doSomething();
y.doSth1();
z.doSth1();
}
}
SuperClass x = new SuperClass();
SuperClass y = new SubClass1();
SuperClass z = new SubClass2();
x.doSomething();
y.doSomething(); //y.doSth1(); 这里错了
z.doSomething(); // z.doSth2(); 着了错了
}你不用IDE 吗? 换 eclipse 吧!
不能调用 SubClass2 里面的 doSth1;
虽然他自己是 SubClass2();当然,运行期间,是以实际的为准,也就是调用的是 SubClass2 的 doSomething,
构造一个类SuperClass,构造属于这个类的两个构造方法及一个普通的成员方法doSomething。再构造两个子类SubClass1及SubClass2继承自SuperClass。在两个子类中重写doSomething方法。在SubClass1类中新加一个doSth1方法。在SubClass2类中新建doSth2方法。声明三个SuperClass引用变量分别指向SuperClass对象,SubClass1对象和SubClass2对象,用它们分别调用成员方法doSomething、doSth1和doSth2看看结果是什么?分析为什么?
请高手再次赐教!
public SuperClass() {
} public SuperClass(String s) {
s = " ";
} public void doSomething() {
System.out.println("这是SuperClass输出的!");
}
}class SubClass1 extends SuperClass {
public void doSomething() {
System.out.println("这是SubClass1输出的!");
} public void doSth1() {
System.out.println("这是doSth1输出的!");
}
}class SubClass2 extends SuperClass {
public void doSomething() {
System.out.println("这是SubClass2输出的!");
} public void doSth2() {
System.out.println("这是doSth2输出的!");
}
}public class testLayer {
public static void main(String arge[]) {
SuperClass x = new SuperClass();
SuperClass y = new SubClass1();
SuperClass z = new SubClass2();
SubClass1 a = new SubClass1();
SubClass2 b = new SubClass2();
x.doSomething();
y.doSomething();//父类的方法被屏蔽了,调用的是子类里的方法
z.doSomething();//父类的方法被屏蔽了,调用的是子类里的方法
//y.doSth1();这里是不可见的,所以不能调用
//z.doSth2();这里是不可见的,所以不能调用
a.doSth1();
b.doSth2();
}
}