1.不带类型写法：
|
1
|
List listWithoutDup =
new
ArrayList(
new
HashSet(listWithDup));
|
2.带类型写法（以String类型为例）：
1)Java 7以下写法：
|
1
|
List<string> listWithoutDup =
new
ArrayList<string>(
new
HashSet<string>(listWithDup));</string></string></string>
|
2)Java 7及以上写法：
|
1
|
List<string> listWithoutDup =
new
ArrayList<>(
new
HashSet<>(listWithDup));</string>
|
样例：
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import
java.util.ArrayList;
import
java.util.HashSet;
import
java.util.List;
public
class
Test {
public
static
void
main(String[] args) {
List<string> listWithDup =
new
ArrayList<string>();
listWithDup.add(
"1"
);
listWithDup.add(
"2"
);
listWithDup.add(
"3"
);
listWithDup.add(
"1"
);
List<string> listWithoutDup =
new
ArrayList<string>(
new
HashSet<string>(listWithDup));
System.out.println(
"list with dup:"
+ listWithDup);
System.out.println(
"list without dup:"
+ listWithoutDup);
}
}</string></string></string></string></string>
|
样例运行结果： list with dup:[1, 2, 3, 1]
list without dup:[3, 2, 1]