實現(xiàn)有功能“1.查詢2.添加3.修改4.刪除”的和ArrayList有關(guān)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, "詩名", '男', 95));

arr.add(new student(2, "書名", '男', 92));

arr.add(new student(3, "畫名", '男', 90));

arr.add(new student(4, "唱名", '男', 111));

arr.add(new student(5, "帥名", '男', 134));

while (true) {

System.out.println("請選擇你要執(zhí)行的功能1.查詢2.添加3.修改4.刪除");

Scanner s = new Scanner(System.in);

int num = s.nextInt();

if (num == 1) {

// 查詢：

System.out.println("執(zhí)行查詢功能");

for (student i : arr) {

System.out.println(i);

}

} else if (num == 2) {

// 添加：

System.out.println("已經(jīng)執(zhí)行添加“3, “張三”, '男', 88”功能，不信可執(zhí)行查詢功能");

arr.add(new student(3, "張三", '男', 88));

} else if (num == 3) {

// 修改：

System.out.println("執(zhí)行修改功能");

System.out.println("請輸入你要修改的學(xué)生的編號");

int bianhao = s.nextInt();

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

if (bianhao == arr.get(i).bianhao) {

System.out.println("你要修改的成績?yōu)槎嗌?");

double d = s.nextDouble();

arr.get(i).ChengJi = d;

}

}

} else if (num == 4) {

// 刪除：

System.out.println("執(zhí)行刪除功能");

System.out.println("請輸入你要刪除的學(xué)生的編號");

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("刪除完畢");

}

}

}

}

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 "編號:" + bianhao + ",\t名字:" + name + ",\t性別:" + sex + ",\t成績:"

+ ChengJi;

}

}