又是把Java基础知识学废的一天，new 一个对象数组，操作时报空指针异常

 public class ThirdInfo {
     private String title;
     private int number;
     private String pay;
     private String count;
 ​
     @Override
     public String toString() {
         return "ThirdInfo{" +
                 "title='" + title + ''' +
                 ", number=" + number +
                 ", pay='" + pay + ''' +
                 ", count='" + count + ''' +
                 '}';
     }
 ​
     public ThirdInfo(String title, String count, String pay) {
         this.title = title;
         this.pay = pay;
         this.count = count;
     }
 ​
     public ThirdInfo(String title, int number, String pay) {
         this.title = title;
         this.number = number;
         this.pay = pay;
     }
     public ThirdInfo(String title, String pay) {
         this.title = title;
         this.pay = pay;
     }
     public String getTitle() {   return title;  }
 ​
     public void setTitle(String title) {    this.title = title; }
 ​
     public int getNumber() {   return number;  }
 ​
     public void setNumber(int number) {  this.number = number; }
 ​
     public String getPay() { return pay;}
 ​
     public void setPay(String pay) { this.pay = pay;}
 ​
     public String getCount() {  return count; }
 ​
     public void setCount(String count) {this.count = count;}
 }
 ​
 class testal{
     public static void main(String[] args) {
         ThirdInfo [] thirdInfos = new ThirdInfo[6];
 ​
         String vipPay[] = new String[]{
                 "3笔", "¥1000.00", "¥100.00", "100积分", "¥10.00", "100积分"
         };
         String vipPaytitle[] = new String[]{
                 "会员消费笔数","储值余额消费","赠送余额消费","积分抵线变动","积分抵扣金额","积分赠送变动"
         };
 ​
         for (int i = 0;i<vipPay.length;i++){
             thirdInfos[i].setTitle(vipPaytitle[i]);
             thirdInfos[i].setPay(vipPay[i]);
         }
 ​
         for (ThirdInfo info : thirdInfos) {
             System.out.println(info);
         }
     }
 }

 String[] str = new String[6];
 String vipPaytitle[] = new String[]{
     "会员消费笔数", "储值余额消费", "赠送余额消费", "积分抵线变动", "积分抵扣金额", "积分赠送变动"
 };
 for (int i=0;i<vipPaytitle.length;i++){
     str[i]=vipPaytitle[i];
 }
 for (int i=0;i<vipPaytitle.length;i++){
     System.out.println(str[i]);
 }

 bipush 6 // 将6压入操作数堆栈。
 anewarray #2 <com/ThirdInfo> //创建一个引用型(如类，接口，数组)的数组，并将其引用值压入栈顶
 astore_1 //把栈顶的值存到第一个变量（thirdInfos ）

 new #2 <com/ThirdInfo> // 创建一个对象
 dup // 复制栈顶数值(数值不能是long或double类型的)并将复制值压入栈顶
 invokespecial #3 <com/ThirdInfo.<init> : ()V> // 调用超类构造方法，实例初始化方法，私有方法
 pop // 出栈

 public class Test {
 ​
     public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
         Class<?> aClass = Class.forName("com.ThirdInfo");
         ThirdInfo o =(ThirdInfo) aClass.newInstance();
         System.out.println(o);
 ​
         ThirdInfo [] thirdInfos = new ThirdInfo[6];
         System.out.println(thirdInfos[0]);
     }
 }

 ThirdInfo [] thirdInfos = new ThirdInfo[6];
 thirdInfos[0]=new ThirdInfo();
 System.out.println(thirdInfos[0]);

 String[] str = new String[6];
 for (int i = 0; i < 6; i++) {
     str[i] = ""+i;
 }
 for (int i = 0; i < 6; i++) {
     System.out.println(str[i]);
 }

 public static void main(String[] args) {
     String str1 = "hello";
     String str2 = "hello";
     str1="abc,hao";
     // 判断地址， 它由true -->false
     System.out.println(str1 == str2);
 }