例子:java
package com.test;ide
import java.util.Arrays;
import java.util.List;spa
public class TestUnsupported {
public static void main(String[] args) {
String[] s = {
"one", "two", "three", "four", "five",
"six", "seven", "eight", "nine", "ten",
};繼承
List a = Arrays.asList(s);
System.out.println(
"a.contains(" + s[0] + ") = " +
a.contains(s[0]));
a.add("eleven"); // Unsupported
a.remove(s[0]); // Unsupported
}
}three
運行後,拋出異常以下:rem
Exception in thread "main" java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:151)
at java.util.AbstractList.add(AbstractList.java:89)
at com.test.TestUnsupported.main(TestUnsupported.java:28)io
解決方法是使用Iterator,或者轉換爲ArrayListclass
List arrayList = new ArrayList(a);thread