package com.imooc.collection;
/**
*Course类
*/
public class Course {
public String id;
public String name;
public Course() {
}
public Course(String id,String name) {
this.id =id;
this.name=name;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Course other = (Course) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
}
package com.imooc.collection;
import java.util.*;
/**
*SetTest类
*/
public static List<Course> coursesToSelect;
private static Scanner console=new Scanner(System.in);
public SetTest() { //初始化
coursesToSelect=new ArrayList<Course>();
console=new Scanner(System.in);
}
/*
*测试add()、addAll()方法
*/
public void testAdd() {
//添加元素到末尾(默认)
Course cr1=new Course("S0041","数据结构"); //创建一个课程对象
coursesToSelect.add(cr1); //通过调用add()方法,传入课程实例到备选课程List中
//添加元素到指定位置
Course cr2=new Course("C3256","C语言");
coursesToSelect.add(0, cr2);;
//批量添加
Course[] course= {new Course("L6693","离散数学"),new Course("H5567","汇编语言")};
coursesToSelect.addAll(Arrays.asList(course)); //传进collection 的具体实例,将course数组转换成List
//在指定位置批量添加
Course[] course2= {new Course("G6698","高等数学"),new Course("D6631","大学英语")};
coursesToSelect.addAll(2,Arrays.asList(course2));
}
/*
*测试ContainsAll( )方法
*/
public void testListContainsAll() {
System.out.println("你要查询多少个课程:"); //运行时赋值为2
int num=console.nextInt();
Course[] courses=new Course[num];
System.out.println("请输入你要查询的课程的名称:"); //运行时赋值为 数据结构 C语言
for(int i=0;i<num;i++) {
System.out.print((i+1)+":");
String name=console.next();
try{
courses[i]=new Course(); }
catch(NullPointerException e) {
System.out.println("空指针异常!!"); }
}
System.out.println(coursesToSelect.containsAll(Arrays.asList(courses))); //结果运行为false ??????
}
xYS1717
相关分类