Android crash记录

CopyOnWriteArrayList arrayList;
HashMap<Integer,String> map = new HashMap<Integer,String>();

public void operationHashMap(){

    for(int i=0;i<10;i++){
        map.put(i,"value"+i);
    }

    // 错误删除map的方式
    for (Map.Entry<Integer,String> entry:map.entrySet()){
        Integer key = entry.getKey();
        if (key % 2 == 0){
            map.remove(key);
        }
    }

    // 正确删除map方式
    List delList = new ArrayList();
    for (Map.Entry<Integer,String> entry:map.entrySet()){
        Integer key = entry.getKey();
        if (key % 2 == 0){
            delList.add(key);
        }
    }

    for (int i=0;i<delList.size();i++){
        map.remove(delList.get(i));
    }

}

Comparator comparator;

static ArrayList<Integer> list = new ArrayList<Integer>();

void testScenario2(){
    for (int i=0;i<100;i++){
        list.add(i);
    }

    Thread1 thread1 = new Thread1();
    thread1.start();
    Thread2 thread2 = new Thread2();
    thread2.start();
}

class Thread1 extends Thread{
    @Override
    public void run() {
        while (true){
            Iterator<Integer> iterator = list.iterator();
            while (iterator.hasNext()){
                System.out.println(iterator.hasNext());
            }
        }
    }
}

class Thread2 extends Thread{
    @Override
    public void run() {
        while (true){
            for (int j=101;j<200;j++){
                list.add(j);
            }
        }
    }
}