Eight-week course with the sixth test report summary

Experiment:
Source:

package exercise;

public class ArrayIndexOutOfBoundsException {
    public static void main(String args[]) {
        int a[] = null;                         //定义数组，初始化为null
        a = new int[5];                         //设置数组大小
        System.out.println("程序开始运行");           //程序开始运行
        try {
            for (int i = 1; i < 10; i++) {              //使数组越界
                a[i - 1] = i - 2;
            }
        } catch (Exception e) {                         //异常类型匹配
            System.out.println(e);                      
            System.out.println("数组越界");             //输出类型
        } finally {
            System.out.println("程序正常结束");               //程序正常结束
        }

    }

}

Run shot:
experimental ideas: because in the past had problems with an array of cross-border experiment to achieve this question is quite simple, the main treatment is given its own unusual enough.

Source:
~~~
Package Exercise;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class DangerEexception extends Exception {
String massage = null;

public DangerException() {
    massage = "bibibi 危险物品：";
}

public String toshow() {
    return massage;

}

}

class Goods {

String name;
boolean isDanger = true;

public Goods(String name) {
    this.name = name;
}

}

public class Machine {
static ArrayList list;

public Machine(ArrayList list) {
    this.list = list;
}

public void ListAdd(String name) {
    list.add(name);
}

public void ListRemove(String name) {
    if (list != null) {
        list.remove(name);
    }
}

void cheakBag(Goods goods) throws Myexception {
    if (goods.isDanger) {
        throw new Myexception();
    }

}

public static void main(String args[]) {
    String n = null;
    int flag = 0;
    list = new ArrayList();
    Machine machine = new Machine(list); 
    Goods goods = new Goods(n);
    machine.ListAdd("打火机");      //添加初始危险物品
    machine.ListAdd("管制刀具");
    machine.ListAdd("汽油");
    machine.ListAdd("化妆品");
    Scanner sc = new Scanner(System.in);
    System.out.println("1.添加危險物品");
    System.out.println("2.刪除危險物品");
    System.out.println("3.物品檢查");
    System.out.print("请输入操作类型:");
    flag = sc.nextInt();
    if (flag == 1) {
        System.out.print("请输入添加的物品：" + " ");
        String x = sc.next();
        machine.ListAdd(x);
        System.out.println("开始检查：");
        System.out.print("待检查物品：" + " ");
        n = sc.next();
        if (list.contains(n)) {
            try {
                machine.cheakBag(goods);
            } catch (Myexception e) {
                System.out.println(e.toshow() + n);
            }

        } else {
            System.out.println("安全通过");
        }
    }
    if (flag == 2) {
        System.out.print("请输入删除的物品：" + " ");
        String x = sc.next();
        machine.ListRemove(x);
        System.out.println("开始检查：");
        System.out.print("待检查物品：" + " ");
        n = sc.next();
        if (list.contains(n)) {
            try {
                machine.cheakBag(goods);
            } catch (Myexception e) {
                System.out.println(e.toshow() + n);
            }

        } else {
            System.out.println("安全通过");
        }
    }
    if (flag == 3) {
        System.out.println("开始检查：");
        System.out.print("待检查物品：" + " ");
        n = sc.next();
        if (list.contains(n)) {
            try {
                machine.cheakBag(goods);
            } catch (Myexception e) {
                System.out.println(e.toshow() + n);
            }

        } else {
            System.out.println("安全通过");
        }
    }
}

}
~~~

Run Screenshot:
Add:

Delete:

check:

thoughts: The subject teacher in the class I said, but when I got the topic, read a bit, and up to now I still do not know what use goods, if it is just a to determine isDanger is true, then can be defined as String name instead of Goods goods, then Goods class definition, but also saved a name and a isDanger, == not quite understand, should be a low level of knowledge, but still basically achieve the requirements of the subject. As well as in the use of the ArrayList class, the beginning I was directly instantiate a list of the queue, then list.add () added, list.remove () to delete, and then thought, required if to add, and then modify the directly defines a ArrayList lsit property, users can achieve the added and deleted at the end, the code, the flag judgment, emm, the code a bit redundant, but still own optimization slowly, because I think the problem a little trouble, then need to think it over and then make changes or because the technology does not work, we have to strengthen training.

summarize: