```
public class temp 
{
    public int data0;//整数
    public int data1;//小数
    public int data2;
    public int data3;
    public long firsttime;
    public temp(int type,int data0, int data1, int data2, int data3,
             long firsttime) {
        super();
        this.data0 = data0;
        this.data1 = data1;
        this.data2 = data2;
        this.data3 = data3;
        this.firsttime = firsttime;
    }

}
public class ShareDate {

   public static temp mtemp=null;
   public static date mdate=null;

}

```

the problem is in `MainActivity` I did like this 

```
ShareDate.mtemp.date0=20; 

```

then the program was stopped unexpected. I don't know where it's wrong?