JAVA中List 排序

第一种方法，就是list中对象实现Comparable接口，代码如下：

public class SortEntity implements Comparable<SortEntity>{
	private String name;
	private Integer age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	@Override
	public int compareTo(SortEntity o) {
		return this.getName().compareTo(o.getName());
	}
}

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

import org.junit.Test;

public class JUnitTest {
	@Test
	public void testSort(){
		List<SortEntity> selist=new ArrayList<>();
		SortEntity se=new SortEntity();
		se.setName("abc");
		se.setAge(50);
		selist.add(se);
		SortEntity se1=new SortEntity();
		se1.setName("abd");
		se1.setAge(13);
		selist.add(se1);
		SortEntity se2=new SortEntity();
		se2.setName("aaa");
		se2.setAge(324);
		selist.add(se2);
		SortEntity se3=new SortEntity();
		se3.setName("abe");
		se3.setAge(5);
		selist.add(se3);
		Collections.sort(selist);
		for (SortEntity s:selist) {
			System.out.println(s.getName());
		}
	}
}

第二种方法，就是在重载Collections.sort方法，代码如下：

public class SortEntity{
	private String name;
	private Integer age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
}

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.junit.Test;

public class JUnitTest {
	@Test
	public void testSort(){
		List<SortEntity> selist=new ArrayList<>();
		SortEntity se=new SortEntity();
		se.setName("abc");
		se.setAge(50);
		selist.add(se);
		SortEntity se1=new SortEntity();
		se1.setName("abd");
		se1.setAge(13);
		selist.add(se1);
		SortEntity se2=new SortEntity();
		se2.setName("aaa");
		se2.setAge(324);
		selist.add(se2);
		SortEntity se3=new SortEntity();
		se3.setName("abe");
		se3.setAge(5);
		selist.add(se3);
		Collections.sort(selist,new Comparator<SortEntity>() {

			@Override
			public int compare(SortEntity o1, SortEntity o2) {
				return o1.getName().compareTo(o2.getName());
			}
		});
		for (SortEntity s:selist) {
			System.out.println(s.getName());
		}
	}
}