Java循环遍历中直接修改遍历对象

Java 循环遍历中直接修改遍历对象如下，会报异常：
      for (ShopBaseInfo sp: sourceList) {
            if(sp.getId()==5){
                sourceList.remove(sp);
            }
        }

Exception in thread "main" java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
    at java.util.ArrayList$Itr.next(ArrayList.java:859)

如果有需要修改循环遍历对象的需求，可以使用迭代器来实现，代码如下：

/**
 * @author jack
 **/
public class ForLoopTest {

    public static void main(String[] args) {
        List<ShopBaseInfo> sourceList = new ArrayList<ShopBaseInfo>();
        ShopBaseInfo shop = null;
        for (long i=0 ;i<8;i++){
            shop = new ShopBaseInfo();
            shop.setId(i);
            shop.setShopName("shop"+i);
            sourceList.add(shop);
        }
        System.out.println("sourcelist init --------");
        printList(sourceList);
/*        for (ShopBaseInfo sp: sourceList) {
            if(sp.getId()==5){
                sourceList.remove(sp);
            }
        }*/

        Iterator<ShopBaseInfo> iterator = sourceList.iterator();
        while (iterator.hasNext()) {
            ShopBaseInfo sbi = iterator.next();
            if(sbi.getId() == 5){
                iterator.remove();
            }
        }
        System.out.println("after sourcelist remove --------");
        printList(sourceList);
    }

    private static void printList(List<ShopBaseInfo> sourceList){
        StringBuilder builder = new StringBuilder();
        for (ShopBaseInfo shop : sourceList ) {
            builder.append("->").append(shop.getShopName());
        }

        System.out.println(builder);
    }
}

运行结果：
sourcelist init --------
->shop0->shop1->shop2->shop3->shop4->shop5->shop6->shop7
after sourcelist remove --------
->shop0->shop1->shop2->shop3->shop4->shop6->shop7

Java循环遍历中直接修改遍历对象

原文：https://www.cnblogs.com/xuzhujack/p/10880821.html