一行代码实现java list去重

1.不带类型写法：

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1	List listWithoutDup = new ArrayList( new HashSet(listWithDup));

2.带类型写法（以String类型为例）：
1)Java 7如下写法：

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1	List<string> listWithoutDup = new ArrayList<string>( new HashSet<string>(listWithDup));</string></string></string>

2)Java 7及以上写法：

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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]