studentproduct.java

用java实现的一个随机抽查学生回答问题的一个软件

package speech;

import java.util.HashMap;

public class StudentProduct {
	
	
	private static Student[] students = null;
	
	private static HashMap stuMap = null;
	
	public static Student[] productStu(){
		if(students == null){
			SaveAndQuery saq = SaveAndQuery.getInstance();
			students = saq.loadStudent();
		}
		return students;
	}
	
	public static HashMap stuHash(){
		if(stuMap == null){
			Student[] stu = productStu();
			stuMap = new HashMap();
			for(int i = 0;i < stu.length;i ++){
				stuMap.put(stu[i].toString(), stu[i]);
			}
		}
		return stuMap;
	}

}