单继承

package lianxii;

public class TestAnimals {

public static void main(String[] args) {

Horse b = new Horse();
System.out.println(b.getI());
// Animal b = new Animal();
// int yy = b.getI();
// System.out.println(yy);
}

}

class Animal {

private final int i = 3;

public int getI() {

return i;
}

// public void setI(int i) {
//
// this.i = i;
// } 这块设置值打开，上面final去掉，结果同样是3

}

class Horse extends Animal {

int i = 2;
}

结果：3