1.不带类型写法：
1 | List listWithoutDup =newArrayList(newHashSet(listWithDup));
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2.带类型写法（以String类型为例）：
1)Java 7以下写法：
1 | List<string> listWithoutDup =newArrayList<string>(newHashSet<string>(listWithDup));</string></string></string>
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2)Java 7及以上写法：
1 | List<string> listWithoutDup =newArrayList<>(newHashSet<>(listWithDup));</string>
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样例：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | importjava.util.ArrayList;
importjava.util.HashSet;
importjava.util.List;
publicclassTest {
publicstaticvoidmain(String[] args) {
List<string> listWithDup =newArrayList<string>();
listWithDup.add("1");
listWithDup.add("2");
listWithDup.add("3");
listWithDup.add("1");
List<string> listWithoutDup =newArrayList<string>(newHashSet<string>(listWithDup));
System.out.println("list with dup:"+ listWithDup);
System.out.println("list without dup:"+ listWithoutDup);
}
}</string></string></string></string></string>
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样例运行结果： list with dup:[1, 2, 3, 1]
list without dup:[3, 2, 1]
