使用TreeSet和Comparator,写TreeSetTest2 要求:对TreeSet中的元素1,2,3,4,5,6,7,8,9,10进行排列,排序逻辑为奇数在前偶数在后,奇数按照升序排列,偶数按照降序排列

/*

 * 使用TreeSet和Comparator,写TreeSetTest2

 *要求:对TreeSet中的元素1,2,3,4,5,6,7,8,9,10进行排列,

 *排序逻辑为奇数在前偶数在后,奇数按照升序排列,偶数按照降序排列

 */

import java.util.Comparator;

import java.util.TreeSet;

 

public class TreeTest2 {

 

public static void main(String[] args) {

// TODO Auto-generated method stub

TreeSet<Integer> treeSet = new TreeSet<>(new SetComparator());

//treeSet.add(-1);

treeSet.add(1);

treeSet.add(2);

treeSet.add(3);

treeSet.add(4);

treeSet.add(5);

treeSet.add(6);

treeSet.add(7);

treeSet.add(8);

treeSet.add(9);

treeSet.add(10);

System.out.println(treeSet);

for (Integer integer : treeSet) {

System.out.print(integer+" ");

}

}

 

}

class SetComparator implements Comparator<Integer>{

 

@Override

public int compare(Integer o1, Integer o2) {

// TODO Auto-generated method stub

if(o1%2==1&&o2%2==0) {

return -1;

}

if(o1%2==0&&o2%2==1) {

return 1;

}

if (o1%2==1&&o2%2==1) {

return o1-o2;

}

if (o1%2==0&&o2%2==0) {

return o2-o1;

}

return 0;

}

 

}

 

/* * 使用TreeSet和Comparator,写TreeSetTest2 *要求:对TreeSet中的元素1,2,3,4,5,6,7,8,9,10进行排列, *排序逻辑为奇数在前偶数在后,奇数按照升序排列,偶数按照降序排列 */import java.util.Comparator;import java.util.TreeSet;
public class TreeTest2 {
public static void main(String[] args) {// TODO Auto-generated method stubTreeSet<Integer> treeSet = new TreeSet<>(new SetComparator());//treeSet.add(-1);treeSet.add(1);treeSet.add(2);treeSet.add(3);treeSet.add(4);treeSet.add(5);treeSet.add(6);treeSet.add(7);treeSet.add(8);treeSet.add(9);treeSet.add(10);System.out.println(treeSet);for (Integer integer : treeSet) {System.out.print(integer+" ");}}
}class SetComparator implements Comparator<Integer>{
@Overridepublic int compare(Integer o1, Integer o2) {// TODO Auto-generated method stubif(o1%2==1&&o2%2==0) {return -1;}if(o1%2==0&&o2%2==1) {return 1;}if (o1%2==1&&o2%2==1) {return o1-o2;}if (o1%2==0&&o2%2==0) {return o2-o1;}return 0;}}

posted @ 2019-06-04 17:08  心丶晨  阅读(778)  评论(0编辑  收藏  举报