1.不带类型写法：
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List listWithoutDup = new ArrayList(new HashSet(listWithDup));
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2.带类型写法（以String类型为例）：
1)Java 7以下写法：
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List<string> listWithoutDup = new ArrayList<string>(new HashSet<string>(listWithDup));</string></string></string>
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2)Java 7及以上写法：
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List<string> listWithoutDup = new ArrayList<>(new HashSet<>(listWithDup));</string>
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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]