Arrays.asList()

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class SimpleArrays {

public static void main(String[] args) {

String[] string = new String[] { "111", "222", "333" };

List<String> list =Arrays.asList(string);;

list.add("444");

System.out.println(list);

}

}

这样必然会报错

Exception in thread "main" java.lang.UnsupportedOperationException

at java.util.AbstractList.add(AbstractList.java:148)

at java.util.AbstractList.add(AbstractList.java:108)

at SimpleArrays.main(SimpleArrays.java:16)

正确的写法应该这样

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class SimpleArrays {

public static void main(String[] args) {

String[] string = new String[] { "111", "222", "333" };

List<String> list =new ArrayList<String>(Arrays.asList(string));

list.add("444");

System.out.println(list);

}

}

完美运行

[111, 222, 333, 444]