首先是eclipse的使用
https://blog.csdn.net/qq_36243942/article/details/81607906
其次是PTA里面Java的格式
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int n=s.nextInt();
int a[]=new int[n];//数组的创建
for(int i=0;i<n;i++) {
a[i]=s.nextInt();//输入
}
System.out.print(j+" "+o);//输出
}
}
Java父类对象调用子类实体：方法重写与动态调用
class Father{
public void announce(){
System.out.println("Father");
}
}
class Child extends Father{
@Override//覆盖
public void announce(){
System.out.println("Child");
}
}
public class Hello {
public static void main(String[] args){
System.out.println("Hello");
Father father=new Child();
father.announce();
}
}
https://www.cnblogs.com/cielosun/p/6580871.html
http://www.voidcn.com/article/p-mgphykic-cb.html
https://www.cnblogs.com/qbdj/p/10869931.html
来源：https://www.cnblogs.com/noraxu/p/12152151.html