java，属性覆盖，方法覆盖

class Rootb

{
int x = 1;

public Rootb(int i)
{
}

public int getI()
{
return x;
}

public void setI(int x)
{
this.x = x;
}

}

class Stemb extends Rootb

{
private int x = 2;

public Stemb(int i)
{
super(i);
}

public int getI()
{
return x;
}

public void setI(int x)
{
this.x = x;
}

}

public class Test

{
public static void main(String args[])
{
Rootb stb = new Stemb(47);
stb.x = 3;
System.out.println(stb.x);
System.out.println(((Stemb) stb).getI());

System.out.println(stb.getI());
System.out.println(((Stemb) stb).getI());

stb.setI(5);
System.out.println(stb.x);
System.out.println(((Stemb) stb).getI());

System.out.println(stb.getI());
System.out.println(((Stemb) stb).getI());

Stemb rootb = (Stemb) new Rootb(47);
rootb.setI(3);
System.out.println(rootb.getI());
System.out.println(((Rootb) rootb).x);

}

}

3

2

2

2

3

5

5

5

Exception in thread "main" java.lang.ClassCastException: Rootb cannot be cast to Stemb
at Test.main(Test.java:59)

结论：java属性不覆盖，方法覆盖。