java 随机抽取案例，不重复抽取

package cn.sasa.demo1;

public class Student {

	private int id;

	private String name;

	public int getId() {

		return this.id;

	}

	public void setId(int id) {

		if(id<0) {

			this.id = 0;

		}else {

			this.id = id;

		}

	}

	public String getName() {

		return this.name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public void SayHi() {

		System.out.println(this.id + "======" + this.name);

	}

}

package cn.sasa.demo1;

import java.util.ArrayList;

import java.util.Random;

public class TestStudent {

	public static void main(String[] args) {

		//要求随机抽取三次，不重复

		ArrayList<Student> stuList = addStu();

		showStuList(stuList);

		getRanStu(stuList);

		showStuList(stuList);

		getRanStu(stuList);

		showStuList(stuList);

		getRanStu(stuList);

		showStuList(stuList);

	}

	public static ArrayList<Student> addStu() {

		ArrayList<Student> stuList = new ArrayList<Student>();

		Student s1 = new Student();

		s1.setId(1);

		s1.setName("abc");

		Student s2 = new Student();

		s2.setId(2);

		s2.setName("bcd");

		Student s3 = new Student();

		s3.setId(3);

		s3.setName("cde");

		Student s4 = new Student();

		s4.setId(4);

		s4.setName("def");

		Student s5 = new Student();

		s5.setId(5);

		s5.setName("efg");

		Student s6 = new Student();

		s6.setId(6);

		s6.setName("fgh");

		stuList.add(s1);

		stuList.add(s2);

		stuList.add(s3);

		stuList.add(s4);

		stuList.add(s5);

		stuList.add(s6);

		return stuList;

	}

	public static void showStuList(ArrayList<Student> stuList) {

		System.out.println("====================================");

		for(int i = 0; i < stuList.size(); i++) {

			stuList.get(i).SayHi();

		}

	}

	public static Student getRanStu(ArrayList<Student> stuList) {

		System.out.println("====================================");

		Random ran = new Random();

		int i = ran.nextInt(stuList.size());

		Student stu = stuList.get(i);

		stuList.remove(i);

		stu.SayHi();

		return stu;

	}

}