java list去重

1.不带类型写法：

1	`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：

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

2)Java 7及以上写法：

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

样例：

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]

That which didn't kill me makes me stronger

巴特西