package abstracttest;
public class ShapeTest {
?shape s1 = new Rectangle();
?s1.zc();
?s1.mj();
?shape s2 = new Circle();
?s2.zc();
?s2.mj();

}

package abstracttest;

public abstract class shape {
?
?public abstract void zc();
?public abstract void mj();

}

package abstracttest;
public class Rectangle extends shape {
?int weight = 3;
?? int hight = 4;
?@Override
?public void zc() {
??// TODO Auto-generated method stub
?? int jxzc = 2*(weight+hight);
?? System.out.println("輸出矩形的周長(zhǎng)"+jxzc);
?}
?@Override
?public void mj() {
??// TODO Auto-generated method stub
??int jxmj = (weight * hight)/2;
??System.out.println("輸出矩形的面積"+jxmj);

?}

}

package abstracttest;

public class Circle extends shape {
int r=3;
?@Override
?public void zc() {
??// TODO Auto-generated method stub
??
??double rzc = 2*3.14*r;
??System.out.println("輸出圓的周長(zhǎng)"+rzc);
?}

?@Override
?public void mj() {
??// TODO Auto-generated method stub
??double rmj = 3.14*r*r;
??System.out.println("輸出圓的面積"+rmj);
????

?}

}