java - 如何从Class的HashSet或HashMap修改变量类

Question

我有一个 HashSet 和一个 HashMap 类。如何修改类变量？所以我有一个数据类，然后我创建数据的 HashSet 和数据的 HashMap然后做人口。后来我想修改值名称和数量。

class Data {
private String name;
private int number;

public Data(String name, int number) {
    this.name = name;
    this.number = number;
}

public String toString() {
    return name + ":" + number;
}
public void modifyNumber (int i) {
    this.number+=i;
} }

public class Main {

public static void main(String[] args) {
Set<Data> dataSet = new LinkedHashSet<Data>();
 Map<String, Data> map = new LinkedHashMap<String, Data>();
 // I do the dataSet and map population, then do something else
 //now I want to modify the value of name and number  for HashSet and HashMap of Class
}}

Answer 1

为Data类创建getter和setter方法然后获取对象并更改它

public void setName(String name){
this.name=name;
}

map.get("id").setName("newname");
map.get("id").modifyNumber(number);