オブジェクトをソートする方法

public class Job {

	private String no;
	private String name;
	private String grade;
	private String ranking;

	public String getNo() {
		return no;
	}

	public void setNo(String no) {
		this.no = no;
	}

	public String getName() {
		return name;
	}

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

	public String getGrade() {
		return grade;
	}

	public void setGrade(String grade) {
		this.grade = grade;
	}

	public String getRanking() {
		return ranking;
	}

	public void setRanking(String ranking) {
		this.ranking = ranking;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((grade == null) ? 0 : grade.hashCode());
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + ((no == null) ? 0 : no.hashCode());
		result = prime * result + ((ranking == null) ? 0 : ranking.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Job other = (Job) obj;
		if (grade == null) {
			if (other.grade != null)
				return false;
		} else if (!grade.equals(other.grade))
			return false;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		if (no == null) {
			if (other.no != null)
				return false;
		} else if (!no.equals(other.no))
			return false;
		if (ranking == null) {
			if (other.ranking != null)
				return false;
		} else if (!ranking.equals(other.ranking))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "Job [no=" + no + ", name=" + name + ", grade=" + grade
				+ ", ranking=" + ranking + "]";
	}

}

import java.util.List;

public class TestSort {

	public static Job[] mySort(List<Job> list) {
		int len = list.size();
		Job[] array = new Job[len];
		for (int i = 0; i < len; i++) {
			array[i] = list.get(i);
		}
		Job temp = null;
		for (int i = 0; i < len; i++) {
			for (int j = 0; j < len - 1; j++) {
				int grade1 = Integer.parseInt(array[i].getGrade());
				int grade2 = Integer.parseInt(array[j].getGrade());
				if (grade1 > grade2) {
					temp = array[i];
					array[i] = array[j];
					array[j] = temp;
				}
			}
		}
		return array;
	}

	public static Job[] paixu(Job[] array) {
		int len = array.length;
		for (int i = 0; i < len; i++) {
			if (i != array.length && i != 0) {
				int grade1 = Integer.parseInt(array[i].getGrade());
				int grade2 = Integer.parseInt(array[i - 1].getGrade());
				if (grade1 == grade2) {
					array[i].setRanking(array[i - 1].getRanking());
				} else {
					array[i].setRanking(i + 1 + "");
				}
			} else {
				array[i].setRanking(1 + "");
			}
		}
		return array;
	}

}

import java.util.ArrayList;
import java.util.List;

public class JobDemo {

	public static void main(String[] args) {
		Job[] array = TestSort.mySort(init());
		for (int i = 0; i < array.length; i++) {
			System.out.println(array[i]);
		}
		System.out.println(" ========================  ");
		Job[] jobArray = TestSort.paixu(array);
		for (int i = 0; i < jobArray.length; i++) {
			System.out.println(jobArray[i]);
		}
	}

	private static List<Job> init() {
		List<Job> list = new ArrayList<Job>();
		Job job = null;
		job = new Job();
		job.setNo(" 11 ");
		job.setName(" test ");
		job.setGrade("67");
		list.add(job);
		
		job = new Job();
		job.setNo(" 22 ");
		job.setName(" test ");
		job.setGrade("67");
		list.add(job);
		
		job = new Job();
		job.setNo(" 33 ");
		job.setName(" test ");
		job.setGrade("78");
		list.add(job);
		
		job = new Job();
		job.setNo(" 44 ");
		job.setName(" test ");
		job.setGrade("55");
		list.add(job);
		
		job = new Job();
		job.setNo(" 55 ");
		job.setName(" test ");
		job.setGrade("99");
		list.add(job);

		job = new Job();
		job.setNo(" 66 ");
		job.setName(" test ");
		job.setGrade("78");
		list.add(job);
		
		job = new Job();
		job.setNo(" 77 ");
		job.setName(" test ");
		job.setGrade("55");
		list.add(job);
		return list;
	}

}