Java Arrays自定义排序的五种写法

Java Arrays自定义排序的几种写法

1. 类对象实现Comparable接口

public class Sort01 {
   
   
    public static void main(String[] args) {
   
   
        A[] arr = new A[4];
        arr[0] = new A("aaa", 10);
        arr[1] = new A("cc", 8);
        arr[2] = new A("dddd", 11);
        arr[3] = new A("bb", 3);

        // 类实现Comparable接口
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));
    }
}

class A implements Comparable<A>{
   
   
    private String name;

    private int grade;

    public A(String name, int grade) {
   
   
        this.name = name;
        this.grade = grade;
    }

    public String getName() {
   
   
        return name;
    }

    public int getGrade() {
   
   
        return grade;
    }
  	
  	@Override
    public String toString() {
   
   
        return "A{" +
                "name='" + name + '\'' +
                ", grade=" + grade +
                '}';
    }

    @Override
    public int compareTo(@NotNull A o) {
   
   
        return grade - o.grade;
    }
}

2. 创建实现Comparator接口的类/匿名内部类

public class Sort01 {
   
   
    public static void main(String[] args) {
   
   
        A[] arr = new A[4];
        arr[0] = new A("aaa", 10);
        arr[1] = new A("cc", 8);
        arr[2] = new A("dddd", 11);
        arr[3] = new A("bb", 3);

        // 创建实现Comparator的类/匿名类
        Arrays.sort(arr, new Comparator<A>() {
   
   
            @Override
            public int compare(A o1, A o2) {
   
   
                return o1.getName().compareTo(o2.getName());
            }
        });
        System