Java：集合，ArrayList，请选择你要执行的功能1.查询2.添加3.修改4.删除，增删改查
实现有功能“1.查询2.添加3.修改4.删除”的和ArrayList有关的程序
package a;
import java.util.ArrayList;
import java.util.Scanner;
public class lizi {
public static void main(String[] args) {
ArrayList<student> arr = new ArrayList<student>();
arr.add(new student(1, "诗名", '男', 95));
arr.add(new student(2, "书名", '男', 92));
arr.add(new student(3, "画名", '男', 90));
arr.add(new student(4, "唱名", '男', 111));
arr.add(new student(5, "帅名", '男', 134));
while (true) {
System.out.println("请选择你要执行的功能1.查询2.添加3.修改4.删除");
Scanner s = new Scanner(System.in);
int num = s.nextInt();
if (num == 1) {
// 查询：
System.out.println("执行查询功能");
for (student i : arr) {
System.out.println(i);
}
} else if (num == 2) {
// 添加：
System.out.println("已经执行添加“3, “张三”, '男', 88”功能，不信可执行查询功能");
arr.add(new student(3, "张三", '男', 88));
} else if (num == 3) {
// 修改：
System.out.println("执行修改功能");
System.out.println("请输入你要修改的学生的编号");
int bianhao = s.nextInt();
for (int i = 0; i < arr.size(); i++) {
if (bianhao == arr.get(i).bianhao) {
System.out.println("你要修改的成绩为多少?");
double d = s.nextDouble();
arr.get(i).ChengJi = d;
}
}
} else if (num == 4) {
// 删除：
System.out.println("执行删除功能");
System.out.println("请输入你要删除的学生的编号");
int bianhao = s.nextInt();
for (int i = 0; i < arr.size(); i++) {
if (bianhao == arr.get(i).bianhao) {
arr.remove(arr.get(i));
}
}
System.out.println("删除完毕");
}
}
}
}
class student {
int bianhao;
double ChengJi;
String name;
char sex;
public student(int bianhao, String name, char sex, double ChengJi) {
this.bianhao = bianhao;
this.name = name;
this.sex = sex;
this.ChengJi = ChengJi;
}
@Override
public String toString() {
return "编号:" + bianhao + ",\t名字:" + name + ",\t性别:" + sex + ",\t成绩:"
+ ChengJi;
}
}
