我正在尝试比较一堆同一类的对象来搜索匹配的 ID? 这是 GroupClass,当输入新条目时,它将根据 idNumber 进行测试以查看是否存在匹配。
Public GroupClass {
private int idNumber;
private String name;
private double income;
public GroupClass(int id, String name, double income){
this.idNumber = id;
this.name = name;
this.income = income;
}
public int getIdNumber() {
return idNumber;
}
public void setIdNumber(int idNumber) {
this.idNumber = idNumber;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getIncome() {
return income;
}
public void setIncome(double income) {
this.income = income;
}
}
这是主要方法
import static java.lang.reflect.Array.set;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Scanner;
import java.util.Set;
public class ListTester {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
Set<GroupClass> groupArray = new LinkedHashSet<>();
System.out.println("Enter a ID Number");
int id = input.nextInt();
System.out.println("Enter a First Name");
String name = input.next();
System.out.println("Enter a an Income");
double income = input.nextDouble();
groupArray.add(new GroupClass(1111, "Billy", 178000));
groupArray.add(new GroupClass(1112, "Sam", 78000));
groupArray.add(new GroupClass(1113, "Mark", 79000));
groupArray.add(new GroupClass(id, name, income));
printTheClass(groupArray);
}
public static void printTheClass(Set group){
for(Object theArray: group){
System.out.println(theArray + " ");
}
}
}
我见过一些类似的问题,但无法让它适用于我的特定情况,提前致谢。
最佳答案
根据上面的评论,您重写了 equals
方法,但这可能不适合该类的长期增长。
但是使用您现有的代码尝试
public static void printTheClass(Set<GroupClass> group){
for(GroupClass theArray: group){
System.out.println(theArray + " ");
}
}
和
public static GroupClass findTheClass(Set<GroupClass> group, int id){
for(GroupClass obj: group){
if(obj.getIdNumber == id) return obj;
}
return null;
}
这可以用作
if (findTheClass (groupArray, id) == null) {
groupArray.add (new GroupClass(id, name, income));
}
关于java - 如何查看对象列表以查找匹配项?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39159732/