一行代碼實現java list去重

1.不帶類型寫法：

?

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

2.帶類型寫法（以String類型爲例）：
1)Java 7如下寫法：

?

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

2)Java 7及以上寫法：

?

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

樣例：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

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>

樣例運行結果： list with dup:[1, 2, 3, 1]
list without dup:[3, 2, 1]