1.不带类型写法：
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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：
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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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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]