android list集合遍历,Java list集合遍历操作崩溃问题

都在子线程动态修改正在进行遍历的list集合，下边是五中遍历的是否崩溃的情况

public class MainActivity extends AppCompatActivity {

    private TextView test;
    private TextView test_2;
    public List<Person> mPersonList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        test = findViewById(R.id.test);
        test_2 = findViewById(R.id.test_2);

        test.setOnClickListener(v -> {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    Person personNew = new Person();
                    personNew.age = 1;
                    personNew.name = "haha";
                    mPersonList.add(personNew);
                    Log.e("zzt_log", "增加了一个，size"+mPersonList.size());
                }
            }).start();

        });

        test_2.setOnClickListener(v -> {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    searchList1();
//                    searchList2();
//                    searchList3();
//                    searchList4();
//                    searchList5();
                }
            }).start();
        });

        for (int i = 0; i < 10; i++) {
            Person personNew = new Person();
            personNew.age = i;
            personNew.name = "haha";
            mPersonList.add(personNew);
        }

    }

    /**
     * TODO for i 的形式，动态修改list集合大小
     *  结果：不会崩溃
     *  list大小会改变（循环次数会随着增多或减少），不会崩溃！！
     */
    public synchronized   void searchList1(){
        for (int i=0; i< mPersonList.size(); i++){
            Person person = mPersonList.get(i);
            Log.e("zzt_log", "i===="+i+", size"+mPersonList.size()+", age:"+person.getAge());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * TODO foreach 的形式，动态修改list集合大小
     *  结果：崩溃！！
     *  底层就是iterator，所以同iterator情况一致
     */
    public synchronized void searchList2(){

        int i = 0;
        for (Person person:mPersonList){
            i++;
            Log.e("zzt_log", "i===="+i+", size"+mPersonList.size()+", age:"+person.getAge());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * TODO foreach + copy 的形式，动态修改list集合大小
     *  结果：不会崩溃！！
     *  mPersonList大小会改变
     *  mPersonListCopy大小不会改变
     */
    public synchronized void searchList3(){

        int i = 0;

        List<Person> mPersonListCopy = new ArrayList(mPersonList);
        for (Person person:mPersonListCopy){
            i++;
            Log.e("zzt_log", "i===="+i+", size"+mPersonListCopy.size()+", age:"+person.getAge()+", mPersonList size:"+mPersonList.size());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * TODO iterator的形式，动态修改list集合大小
     *  结果：崩溃！！
     */
    public synchronized void searchList4(){

        Iterator<Person> iterators = mPersonList.iterator();
        while (iterators.hasNext()) {
            Person session = iterators.next();
            if (session.getAge() == 5) {
                iterators.remove();
            }
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            Log.e("zzt_log", "while size"+mPersonList.size());
        }


    }

    /**
     * TODO iterator + copy 的形式，动态修改list集合大小
     *  结果：不会崩溃！！
     *  mPersonList大小会改变
     *  mPersonListCopy大小不会改变
     */
    public synchronized void searchList5(){
        List<Person> mPersonListCopy = new ArrayList(mPersonList);
        Iterator<Person> iterators = mPersonListCopy.iterator();
        while (iterators.hasNext()) {
            Person session = iterators.next();
            if (session.getAge() == 5) {
                iterators.remove();
            }
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            Log.e("zzt_log", "mPersonListCopy size"+mPersonListCopy.size()+", mPersonList size:"+mPersonList.size());
        }


    }
}