List自定義排序根據Collections.sort過載方法來實現，實現Comparable介面。

實現Comparator ,重寫compare方法。

public class DataSort implements Comparator<Student>{

	
	/**
	 * 重寫方法 實現自定義排序
	 */
	@Override
	public int compare(Student o1, Student o2) {
		int i = o1.getAge() - o2.getAge();//按照年齡排序(從小到大)   
        //年齡相等的情況下
		if(i == 0){  
            return 0;  
        }  
        return i;  
	}
	
	
	public static void main(String[] args) {
		List<Student> students = new ArrayList<Student>();  
        students.add(new Student(11));  
        students.add(new Student(21));  
        students.add(new Student(31));  
        students.add(new Student(22));  
        students.add(new Student(15));  
        students.add(new Student(27));  
        for(Student stu : students) {  
            System.out.println("age:" + stu.getAge());  
        }  
        Collections.sort(students,new DataSort());  //排序
        for(Student stu : students) {  
            System.out.println("age:" + stu.getAge());  
        }  	
	}
}
 

student類：

public class Student {
	  
    private int age;  
   
    public Student(int age) {
		super();
		this.age = age;
	}
	public int getAge() {  
        return age;  
    }  
    public void setAge(int age) {  
        this.age = age;  
    }  

}