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TreeSetTest.java
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38 lines (31 loc) · 927 Bytes
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package treeSet;
import java.util.Comparator;
import java.util.SortedSet;
import java.util.TreeSet;
public class TreeSetTest {
public static void main(String[] args) {
SortedSet<Item> parts=new TreeSet<>();
parts.add(new Item("aom",123));
parts.add(new Item("cack",234));
parts.add(new Item("boaster",456));
//按照添加顺序输出--说明TreeSet是有序的
System.out.println(parts);
//比较器，一般用匿名函数给出---比较方法的持有器
/*new TreeSet<>(Comparator<? super E> comparator)
构造一个新的空 TreeSet，它根据指定比较器进行排序。
*
*/
SortedSet<Item> sortByDescription=new TreeSet<>(
new Comparator<Item>(){
@Override
public int compare(Item a, Item b) {
String descA=a.getDescription();
String descB=b.getDescription();
return descA.compareTo(descB);
}
}
);
sortByDescription.addAll(parts);
System.out.println(sortByDescription);
}
}