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java list去重
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]
java list去重
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