java的空指针异常？明明没有显示，却总是错误

[猫咪爷爷]

我是java初学者，写了个老师给的作业，但是如题，明明都没有红线画出，却总是显示：
Exception in thread "main" java.lang.NullPointerException
at mywares.Mywares.main(Mywares.java:59)
这是什么缘故呢？我现在只大概知道是 ware[i].setId(a1)那部分出了问题，能帮忙解决一下吗，大神们，求助啊，如何能成功运行我的代码。

package mywares;

/**
 *
 * @author Administrator
 */

import java.io.*;
import java.util.*;

public  class Ware implements Serializable
{
    public int id;
    private static final long serialVersionUID = 1L;

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 89 * hash + this.id;
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Ware other = (Ware) obj;
        if (this.id != other.id) {
            return false;
        }
        return true;
    }
    
    public String name;
    public int num;
    public int my_money;
    public int sell_money;

    public  Ware(int id, String name, int num, int my_money, int sell_money) 
    {
        this.id = id;
        this.name = name;
        this.num = num;
        this.my_money = my_money;
        this.sell_money = sell_money;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }

    public int getMy_money() {
        return my_money;
    }

    public void setMy_money(int my_money) {
        this.my_money = my_money;
    }

    public int getSell_money() {
        return sell_money;
    }

    public void setSell_money(int sell_money) {
        this.sell_money = sell_money;
    }

    @Override
    public String toString() {
        return "商品：" + "商品号：" + id + ",商品名：" + name + ", 库存数量：" + num + ", 入库价格：" + my_money + ", 销售价格：" + sell_money ;
    }
    
}

import java.util.Scanner;
import java.util.HashMap; 
import java.util.Iterator;
import java.io.* ;
import java.text.*;
import java.util.*;
import java.awt.*;

public class Mywares {

   

    public static void write(String path,Object obj)throws IOException
    {
        File f = new File(path) ;
	OutputStream out = new FileOutputStream(f,true) ;
        
	ObjectOutputStream oos = new ObjectOutputStream(out) ;//写入对象
	oos.writeObject(obj) ;
	oos.close() ;
	System.out.println("-----写入成功....");
    }
    public static Object read(String path) throws Exception
    {
	File f = new File(path) ;
	InputStream in = new FileInputStream(f) ;
        
	ObjectInputStream ois = new ObjectInputStream(in) ;//读取对象
	Object obj = ois.readObject();
	ois.close();
	return obj ;
    }
    
    
    
    public static void main(String[] args) throws Exception,IOException
    {

       Scanner in=new Scanner(System.in);
       Ware [] ware=new Ware[100];
       int i=0;
       String path="f:\\test.txt";
       HashMap<Integer,Ware> map=new HashMap<Integer,Ware>();//哈希表内<>必须有类，inteGer是一个包装类
       int s=in.nextInt();
       if(s==1)
       {
         while(true)
           {
               
               
              System.out.println("输入商品id");
              int a1=in.nextInt();
              ware[i].setId(a1);
              
              System.out.println("输入商品名称");              
              String a2=in.next();
              ware[i].setName(a2);
              
              System.out.println("输入商品入库价");
              int a3=in.nextInt();
              ware[i].setMy_money(a3);
              
              System.out.println("输入商品数量");
              int a4=in.nextInt();
              ware[i].setNum(a4);
              
              System.out.println("输入商品出售价格");
              int a5=in.nextInt();
              ware[i].setSell_money(a5);
              
              System.out.println("已成功输入商品  "+ware[i]);
              
              map.put(ware[i].getId(), ware[i]);
              write(path,ware[i]);
              i++; 
           } 
       }
       
       
    }
}

[teemai]

Ware [] ware=new Ware[100]; 这里面的ware没有初始化

[teemai]

ware[i] = new Ware();

[Rdxer]

ware[i]=new Ware(a1, a2,a3, a4,a5); write(path,ware[i]); System.out.println("已成功输入商品 "+ware[i]); map.put(ware[i].getId(), ware[i]); 后面改成这个啊 先new 对象到数组里 然后把前面的 赋值的都注释掉...

[javakeffer]

main方法里是死循环吧

[猫咪爷爷]

3楼的答案完美执行，本来还想去百度发的，看来不用了