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Detailed explanation of Java sorting method sort usage

高洛峰
Release: 2017-01-17 12:00:04
Original
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The examples in this article share Java's sorting methods for arrays and collections for your reference. The specific content is as follows

Sort arrays:

//对数组排序
public void arraySort(){
  int[] arr = {1,4,6,333,8,2};
  Arrays.sort(arr);//使用java.util.Arrays对象的sort方法
  for(int i=0;i<arr.length;i++){
    System.out.println(arr[i]);
  }
}
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Sort the collection:

//对list升序排序
  public void listSort1(){
    List<Integer> list = new ArrayList<Integer>();
    list.add(1);
    list.add(55);
    list.add(9);
    list.add(0);
    list.add(2);
    Collections.sort(list);//使用Collections的sort方法
    for(int a :list){
      System.out.println(a);
    }
  }
  //对list降序排序
  public void listSort2(){
    List<Integer> list = new ArrayList<Integer>();
    list.add(1);
    list.add(55);
    list.add(9);
    list.add(0);
    list.add(2);
    Collections.sort(list, new Comparator<Integer>() {
      public int compare(Integer o1, Integer o2) {
        return o2 - o1;
      }
    });//使用Collections的sort方法,并且重写compare方法
    for(int a :list){
      System.out.println(a);
    }
}
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Note: The sort method of Collections is arranged in ascending order by default. If you need to sort in descending order, you need to override the compare method

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