java list去重

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1.不帶類型寫法：

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

2.帶類型寫法（以String類型為例）：
1)Java 7以下寫法：

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>

範例：

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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>

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

java list去重