Question

你好，我有一个关于使用类型实现的类的问题。我在下面有类代码和Main。我正在尝试读取文本文件，该文件包含Main中的状态行，例如“ Alaska，Ak，10”。然后将对象加载到数组中并使用sort。我想通过输出数组列表中的所有实例对象来检查的正确实现。我无法理解如何通过输出实例对象来检查实现是否正确。

package com.company;

public class State implements Comparable<State> {
public String name;
public String code;
public int region;

public State(String name, String code, int region) {
    this.name = name;
    this.code = code;
    this.region = region;
}

@Override
public String toString() {
    return "State{" +
            "name='" + name + '\'' +
            ", code='" + code + '\'' +
            ", region=" + region +
            '}';
}

@Override
public int compareTo(State o) {
    while (this.region != o.region) {
        if (this.region < o.region)
            return o.region;
         else
            return this.region;}
    if(this.code.compareTo(o.code)< 0 )
        return -1;
    else if(this.code.compareTo(o.code) > 0)
        return 1;
    else return 0;}}

在主屏幕中：

 public static void main(String[] args) {

    File myStates = new File("states.txt");
    ArrayList<State> stateList = new ArrayList<>();

    try { Scanner input = new Scanner(myStates);
        while (input.hasNextLine()) {
            String line = input.nextLine();
            String[] array = line.split(",");
            int x = Integer.parseInt(array[2]);
            stateList.add(new State(array[0], array[1],x));
            java.util.Collections.sort(stateList);
            for(State s : stateList)
            System.out.println(s);

<Comparable>类型类Java

0 个答案: