FeiGe快递系统——继承

父类

public class Uncle {
private String name;
private int age;
public Uncle(){
System.out.println("uncle构造方法");
}

public void fahongbao(){
    System.out.println("舅舅发红包");
}

}

子类一：

public class UncleOne extends Uncle{
public UncleOne(){
super();
System.out.println("uncleone的构造方法");
}
public void chouyan(){
System.out.println("大舅喜欢抽烟");
}
public void fahongbao(){
System.out.println("大舅家道中落，发不起红包了，该送祝福了");
}
}
多层继承：

public class UncleUneSon extends UncleOne{
public UncleUneSon(){

    System.out.println("UncleOneSon的构造方法");
}
public void fahongbao(){
    System.out.println("大舅的儿子厉害了，接着发红包");
}

}

子类二：

public class UncleTwo extends Uncle{
public void hejiu(){
System.out.println("二舅喜欢喝酒");
}
//方法的重写 复写 覆写
public void fahongbao(){
System.out.println("二舅不仅发红包还送茅台");
}

}

public class Demo {
public static void main(String[] args) {
/* UncleOne uncleOne=new UncleOne();
uncleOne.fahongbao();
uncleOne.chouyan();

    UncleTwo uncleTwo=new UncleTwo();
    uncleTwo.fahongbao();
    uncleTwo.hejiu();

    UncleUneSon uncleUneSon=new UncleUneSon();
    uncleUneSon.fahongbao();*/
   UncleUneSon uncleUneSon= new UncleUneSon();
}

}
package edu.xcdq;

public class Demo01 {
public static void main(String[] args) {
final double PI=3.14;
//PI=6.25;
final int[]a=new int[]{1,2,3};
a[0]=10;
a[1]=20;
a[2]=30;
int []b=new int[3];

    System.out.println(a[0]);
    System.out.println(a[1]);
    System.out.println(a[2]);
}

}