java.lang.UnsupportedOperationException
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转载地址:http://blog.csdn.net/tolcf/article/details/38597217
代码:
- public static void main(String[] args) {
- String[] arr ={”a”,“b”,“c”};
- List<String> list = Arrays.asList(arr);
- list.add(”d”);
- list.add(”e”);
- }
public static void main(String[] args) { String[] arr ={"a","b","c"}; List<String> list = Arrays.asList(arr); list.add("d"); list.add("e"); }
运行结果:
- Exception in thread “main” java.lang.UnsupportedOperationException
- at java.util.AbstractList.add(AbstractList.java:131)
- at java.util.AbstractList.add(AbstractList.java:91)
- at com.cn.test.main(test.java:11)
Exception in thread "main" java.lang.UnsupportedOperationException at java.util.AbstractList.add(AbstractList.java:131) at java.util.AbstractList.add(AbstractList.java:91) at com.cn.test.main(test.java:11)
修改方法:
List arrayList =new ArrayList(a);
例如:
- public static void main(String[] args) {
- String[] arr ={”a”,“b”,“c”};
- List<String> list = Arrays.asList(arr);
- List arrList = new ArrayList(list);
- arrList.add(”d”);
- arrList.add(”e”);
- }
public static void main(String[] args) { String[] arr ={"a","b","c"}; List<String> list = Arrays.asList(arr); List arrList = new ArrayList(list); arrList.add("d"); arrList.add("e"); }
原因:
在使用Arrays.asList()后调用add,remove这些method时出现java.lang.UnsupportedOperationException异常。这是由于Arrays.asList() 返回java.util.Arrays
原创不易,参考文件:http://blog.csdn.net/thunderous/article/details/3693362
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