[英]How to sort arrays of different datatypes
我正在尝试按字母顺序对候选人名称进行排序,同时对候选人获得的票进行排序,我采用了两个数组,一个用于名称,另一个用于投票,因为我按投票名称数组需要在这里进行排序,我无法对其进行排序,请帮助这里是我的码:
package com.sarga.Swinglearn;
import java.util.Scanner;
public class Project3 {
public static void main(String[] args)
{
int i=0,j=0;
Scanner s=new Scanner(System.in);
System.out.println("Enter number of candidates");
int candcount = Integer.parseInt(s.nextLine());
System.out.println("Enter name of the candiadates");
String names[]=new String[candcount];//create an array
for( i=0;i<names.length;i++)
{
names[i]=s.nextLine();
}
System.out.println("candidates are: ");
for(i=0;i<candcount;i++)
System.out.println(names[i]);
for(i=0;i<candcount;i++)
{
for(j=i;j<candcount;j++)
{
if(names[i].compareTo(names[j])>0)
{
String temp=names[i];
names[i]=names[j];
names[j]=temp;
}
}
}
/*To sort names alphabetically*/
System.out.println("alphabetical order of candidates");
for(i=0;i<candcount;i++)
{
System.out.println(names[i]);
}
System.out.println("Enter number of votes of each candidate");
int votes[]=new int[candcount];
for(i=0;i<candcount;i++)
{
votes[i]=s.nextInt();
System.out.println(names[i]+":"+votes[i]);
}
//sort names based on their votes
System.out.println("List of candidates according to their votes");
//int max= votes[1];
int temp=0;
for(i=0;i<candcount-1;i++)
{
for(j=i;j<candcount;j++)
{
if(votes[i]<votes[j])
{
temp=votes[i];
votes[i]=votes[j];
votes[j]=temp;
}
}
}
for(i=0;i<candcount;i++)
System.out.println(names[i]+":"+votes[i]);
s.close();
}
}
创建一个Candidate
类:
public class Candidate implements Comparable<Candidate> {
private String name;
private int votes;
public Candidate(String name, int votes) {
this.name = Objects.requireNotNull(name);
this.votes = votes;
}
// Getters and setters
@Override
public int compareTo(Candidate that) {
int c = this.name.compareTo(that.name);
if(c != 0) return c;
return this.votes - that.votes;
}
}
接下来,创建这些候选人的列表并对其进行排序:
List<Candidate> clist = new ArrayList<>();
// Add some Candidates to clist
Collections.sort(clist);
您应该使用面向对象的范例; 创建一个实现Comparable接口的Candidate
类:
public class Candidate
implements Comparable<Candidate>
{
public String name; /* should use getter and setter */
public int votes; /* idem */
public int compareTo(Candidate other)
{
/* implements the comparison, see Comparable doc */
}
}
然后在您的main中排序一个候选数组:
Candidate[] candidates = new Candidate[candcount];
/* populates the array */
Arrays.sort(candidates);
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