我要建立一個(gè)寵物商店- =先建立一個(gè)animal類(lèi)package pethome;public class Animal {? ? ? ? private int age;? ? ? ? private String name ;? ? ? ??? ? ? ? public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public void show(){? ? ? ? System.out.println(getAge()+"\t"+getName());? ? ? ? }}?然后開(kāi)始寫(xiě)主函數(shù)package pethome;import java.util.*;public class Demo { public static void main(String[] args) { Scanner in=new Scanner(System.in); Animal[] animal=new Animal[9]; int k=0; System.out.println("welcome to the pethome! What do you want to do ? "); while(true) { System.out.println("1.add the pet"); System.out.println("2.delete the pet"); ? ? for(int i=0;i<9 ;i++){ ? ? if(animal[i]!=null){ animal[i].show();? System.out.println("\n"); } } ? ??? ? ? ? ?int a=in.nextInt(); switch(a){ case 1: System.out.println("please inset the name "); String b=in.nextLine(); animal[k].setName(b); System.out.println("please inset the age"); ? ? ?int c=in.nextInt(); ? animal[k].setAge(c); k++; break; } } }} 這個(gè)程序我沒(méi)做完，想測(cè)試一下第一個(gè)添加寵物的函數(shù)。問(wèn)題是在這里，這是我的運(yùn)行界面welcome to the pethome! What do you want to do ??1.add the pet2.delete the pet1please inset the name?Exception in thread "main" java.lang.NullPointerException at pethome.Demo.main(Demo.java:27)說(shuō)我的animal[]數(shù)組沒(méi)有內(nèi)存，b和c的值并沒(méi)有錄入到animal【0】的name和age里!求大神解答