In an attempt to remove duplicate elements from list, I go to the lengths to take advantage of methods in the java api. After investiagting the document of java api, the result is so satisfying that I speak hightly of wisdom of developer of java language.Next
I will introduce charming usage about set in the java.
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.TreeSet;
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public class SetUtil
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{
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public static List<String> testStrList = Arrays.asList("Apple", "Orange",
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"Pair", "Grape", "Banana", "Apple", "Orange");
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public static void sort()
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{
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Set<String> sortSet = new TreeSet<String>(testStrList);
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System.out.println(sortSet);
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}
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public static void removeDuplicate()
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{
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Set<String> uniqueSet = new HashSet<String>(testStrList);
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System.out.println(uniqueSet);
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<span style="font-family: Arial, Helvetica, sans-serif;">
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}
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public static void reverse()
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{
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Set<String> sortSet = new TreeSet<String>(testStrList);
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List<String> sortList = new ArrayList<String>(sortSet);
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Collections.reverse(sortList);
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System.out.println(sortList);
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}
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public static void swap()
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{
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Set<String> sortSet = new TreeSet<String>(testStrList);
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List<String> sortList = new ArrayList<String>(sortSet);
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Collections.swap(sortList, 0, sortList.size() - 1);
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System.out.println(sortList);
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output : [Apple, Orange, Grape, Banana, Pair]
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}
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public static void main(String[] args)
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{
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SetUtil.sort();
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SetUtil.reverse();
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SetUtil.swap();
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SetUtil.removeDuplicate();
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}
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}
【DataStructure】Charming usage of Set in the java,布布扣,bubuko.com
【DataStructure】Charming usage of Set in the java
原文：http://blog.csdn.net/sxb0841901116/article/details/38548919
