集合：排序例子（根据年龄排序）

╰半夏微凉° 2021-12-20 14:03 309阅读 0赞

Person类：

package day14;
    
    public class Person {
        
    	public int id;
    	public String nameString;
    	public int age;
    
    	public Person(int id, String nameString, int age) {
        
    		super();
    		this.id = id;
    		this.nameString = nameString;
    		this.age = age;
    	}
    
    	public int getId() {
        
    		return id;
    	}
    
    	public void setId(int id) {
        
    		this.id = id;
    	}
    
    	public String getNameString() {
        
    		return nameString;
    	}
    
    	public void setNameString(String nameString) {
        
    		this.nameString = nameString;
    	}
    
    	public int getAge() {
        
    		return age;
    	}
    
    	public void setAge(int age) {
        
    		this.age = age;
    	}
    
    }

PersonSort类：

package day14;
    
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Comparator;
    import java.util.List;
    
    public class PersonSort {
        
    	static List<Person> list = new ArrayList<Person>();
    
    	public static void main(String[] args) {
        
    		// TODO Auto-generated method stub
    
    		list.add(new Person(1001, "消声量", 23));
    		list.add(new Person(1002, "孙悟空", 900));
    		list.add(new Person(1003, "猪八戒", 700));
    		System.out.println("排序前的结果：" + list);
    		for (int i = 0; i < list.size(); i++) {
        
    			System.out.println("姓名：" + list.get(i).getNameString() + "\t" + "学号：" + list.get(i).getId() + "\t" + "年龄："
    					+ list.get(i).getAge());
    		}
    		Collections.sort(list, new Comparator<Person>() {
        
    
    			@Override
    			public int compare(Person o1, Person o2) {
        
    				// TODO Auto-generated method stub
    				if (o1.getAge() > o2.getAge()) {
        
    					return 1;
    				}
    				if (o1.getAge() == o2.getAge()) {
        
    					return 0;
    
    				}
    
    				return -1;
    
    			}
    		});
    		System.out.println("排序后的结果：" + list);
    
    		for (int i = 0; i < list.size(); i++) {
        
    			System.out.println("姓名：" + list.get(i).getNameString() + "\t" + "学号：" + list.get(i).getId() + "\t" + "年龄："
    					+ list.get(i).getAge());
    		}
    
    	}
    
    }