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| − | == 任务二 JAVA程序开发基础 ==
| + | *[[商苑面馆：Java程序开发基础]] |
| − | | |
| − | ===2.1变量和表达式===
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| − | *[[Java练习：面馆点餐]] | |
| − | | |
| − | *Java控制台输入：
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| − | | |
| − | <nowiki>import java.util.Scanner;
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| − |
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| − | public class Test {
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| − | public static void main(String[] args) {
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| − | Scanner scan = new Scanner(System.in);
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| − | // 从键盘接收数据
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| − |
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| − | // next方式接收字符串
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| − | System.out.println("next方式接收：");
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| − |
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| − | String str1 = scan.next();
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| − | String str2 = "刀削面";
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| − | if(str1.equals(str2)){
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| − | System.out.println("您选择的是：" + str1);
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| − | }
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| − |
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| − | scan.close();
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| − | }
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| − | }</nowiki>
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| − | | |
| − | ===2.2智能决策：选择结构===
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| − | ====三目运算符====
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| − | | |
| − | <nowiki>package demo1;
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| − | import java.util.Scanner;
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| − | public class happy08 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | //int a = 10 ;int b = 20;
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| − | //System.out.println(a==b);
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| − | Scanner sc = new Scanner(System.in);
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| − | System.out.println("客官，您是堂吃还是外卖？1.堂吃； 2.外卖");
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| − | String s = sc.next();
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| − | String s2 = (s.equals("1")) ? "堂吃一位" : "外送一位";
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| − | System.out.println(s2);
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| − | | |
| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ====if条件语句====
| |
| − | | |
| − | 第一种形式：
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| − | | |
| − | <nowiki>public class Hello123 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | // TODO Auto-generated method stub
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| − | float mian = 10.0f;//面的价格
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| − | float suan = 2.0f;//酸梅汤
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| − | float total_pay =0f;//总钱数
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| − | Scanner sc = new Scanner(System.in);
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| − | //问用户要几碗面？
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| − | System.out.println("请问您要几碗面？");
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| − | int num = sc.nextInt();
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| − | total_pay = num * mian;
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| − |
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| − | //问顾客需不需要饮料（饮料2元一杯）
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| − |
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| − | System.out.println("请问您是否需要饮料？Y/n");
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| − | String s = sc.next( );
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| − | if( s.equals("y")){
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| − | total_pay = total_pay + num * suan;
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| − | }
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| − |
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| − | System.out.printf("您一共消费了%f元",total_pay);
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| − | sc.close();
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | 第2种形式：
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| − | | |
| − | <nowiki>package demo1;
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| − | import java.util.Scanner;
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| − | public class Tangchi {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | Scanner sc = new Scanner(System.in);
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| − | System.out.println("客官，请问您是堂吃还是外送？"
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| − | +"1.堂吃/2.外送");
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| − | String s = sc.next();
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| − | if(s.equals("1")){
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| − | System.out.println("堂吃一位！");
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| − | }else{
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| − | System.out.println("外送一位！");
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| − | }
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | 第3种形式：
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| − | | |
| − | <nowiki>package demo1;
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| − | import java.util.Scanner;
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| − | public class MianType {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | Scanner sc = new Scanner(System.in);
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| − | System.out.println("客官，您几位？");
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| − | int num = sc.nextInt();
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| − | System.out.println("请问你们吃什么面？");
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| − | System.out.println("a.老北京炸酱面;b.刀削面"
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| − | +"c.油泼面");
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| − | String s = sc.next();
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| − | if(s.equals("a")){
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| − | System.out.printf("老北京炸酱面%d碗",num);
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| − | }else if(s.equals("b")){
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| − | System.out.printf("刀削面%d碗",num);
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| − | }else if(s.equals("c")){
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| − | System.out.printf("油泼面%d碗",num);
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| − | }else{
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| − | System.out.println("不好意思，您需求的面我们这里没有");
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| − |
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| − | }
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | | |
| − | ====if语句的嵌套====
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| − | | |
| − | <nowiki>询问顾客吃什么面，并询问其是否加蛋、加油渣 ？将结果反馈给后台。</nowiki>
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| − | | |
| − | ====if语句的多条件====
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| − | | |
| − | <nowiki>import java.util.Scanner;
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| − | public class happy09 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | float price ;boolean fenqi;boolean firstpay;
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| − | System.out.println("老板，请问手机多少钱？");
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| − | Scanner sc = new Scanner(System.in);
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| − | price = sc.nextFloat();
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| − | System.out.println("老板，请问支不支持分期?");
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| − | fenqi = sc.nextBoolean();
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| − | System.out.println("老板，请问支不支持零首付?");
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| − | firstpay = sc.nextBoolean();
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| − |
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| − | if(price <=1000 && fenqi == true && firstpay == true) {
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| − | System.out.println("小Case!");
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| − | }else {
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| − | System.out.println("太贵了，买不起~");
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| − | }
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ====switch语句====
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| − | | |
| − | <nowiki>package test;
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| − | import java.util.Scanner;
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| − | public class a7 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO 自动生成的方法存根
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| − | Scanner sc = new Scanner (System.in);
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| − | while (true){
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| − | System.out.println("客观，请问您需要什么面：");
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| − | System.out.print("1.刀削面\n2.蛋黄面\n3.玉米面\n4.牛筋面\n5.幸福小丸仔面\n");
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| − | int m = sc.nextInt();
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| − | switch (m){
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| − | case 1:
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| − | System.out.println("您选择的是刀削面");
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| − | break;
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| − | case 2:
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| − | System.out.println("您选择的是蛋黄面");
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| − | break;
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| − | case 3:
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| − | System.out.println("您选择的是玉米面");
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| − | break;
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| − | case 4:
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| − | System.out.println("您选择的是牛筋面");
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| − | break;
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| − | case 5:
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| − | System.out.println("您选择的是幸福小丸仔面");
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| − | break;
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| − | default:
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| − | System.out.println("对不起 输入错误");
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| − | break;
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| − | }
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| − | }
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| − | | |
| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ===2.3重复迭代：循环结构===
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| − | ====while循环====
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| − | <nowiki>package test;
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| − | import java.util.Scanner;
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| − | public class a7 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO 自动生成的方法存根
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| − | Scanner sc = new Scanner (System.in);
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| − | while (true){
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| − | System.out.println("客观，请问您需要什么面：");
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| − | System.out.print("1.刀削面\n2.蛋黄面\n3.玉米面\n4.牛筋面\n5.幸福小丸仔面\n");
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| − | int m = sc.nextInt();
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| − | switch (m){
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| − | case 1:
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| − | System.out.println("您选择的是刀削面");
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| − | break;
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| − | case 2:
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| − | System.out.println("您选择的是蛋黄面");
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| − | break;
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| − | case 3:
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| − | System.out.println("您选择的是玉米面");
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| − | break;
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| − | case 4:
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| − | System.out.println("您选择的是牛筋面");
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| − | break;
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| − | case 5:
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| − | System.out.println("您选择的是幸福小丸仔面");
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| − | break;
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| − | default:
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| − | System.out.println("对不起 输入错误");
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| − | break;
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| − | }
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| − | }
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| − | | |
| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ====for循环====
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| − | <nowiki>public class test02 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | //String a ="hello";
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| − | String [] menu = {"阳春面","油泼面","鸡汤面","火鸡面","安徽板面"};
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| − | for(int i=0;i <5;i++){
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| − | System.out.println(menu[i]);
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| − | }
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| − |
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ====循环的嵌套====
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| − | <nowiki>public class test03 {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | String [] menu = {"阳春面","油泼面","鸡汤面","火鸡面","安徽板面"};
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| − | String [] drink = {"可乐","啤酒","雪碧"};
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| − | for(int i=0;i<5;i++){
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| − | for(int j=0;j<3;j++){
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| − | System.out.println(menu[i]+"+"+drink[j]);
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| − | }
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| − | }
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| − | }
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| − | | |
| − | }</nowiki>
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| − | | |
| − | ===2.4 数据的存储--数组===
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| − | ====Java一维数组====
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| − | *面馆老板现在需要重新定义一份菜单，使用一维数组，他有几种方法呢 ？
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| − | | |
| − | <nowiki>public class HelloWorld {
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| − | public static void main(String []args) {
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| − | //System.out.println("Hello World!");
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| − | String menu = new String[5];
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| − | menu[0] = "炸酱面";
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| − | menu[1] = "刀削面";
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| − | menu[2] = "安徽板面";
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| − | menu[3] = "葱油拌面";
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| − | menu[4] = "兰州拉面";
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| − |
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| − |
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| − |
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| − | }
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| − | }</nowiki>
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| − | | |
| − | ====Java二维数组====
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| − | *面馆老板现在需要根据周一到周五，每天推出三款特价面，利用二维数组，他该怎么做呢 ？
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| − | <nowiki>
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| − | | |
| − | public class erweishuzu {
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| − | | |
| − | public static void main(String[] args) {
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| − | // TODO Auto-generated method stub
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| − | //double [][] priec = new double [4] [3];
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| − | String [][] price = {{"炸酱面","方便面","版面"},{"刀削面","拉面","炒面"},{"牛肉面","鸡汤面","红烧面"},{"炒面","拉面","刀削面"},{"牛肉面","红烧面","鸡汤面"}};
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| − |
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| − | for(int i=0;i<5;i++) {
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| − | System.out.println("周"+(i+1));
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| − | for(int j = 0;j<3;j++) {
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| − | System.out.println(price[i][j]);
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| − | }
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| − | }
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| − | }
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| − | | |
| − | }
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| − | </nowiki>
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| − | | |
| − | ====Javva for语句循环遍历数组====
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| − | *面馆老板用foreach语句遍历打印每一种面。
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| − | <nowiki></nowiki>
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| | | | |
| | ==任务三、四、五 JAVA面向对象程序编程（一）== | | ==任务三、四、五 JAVA面向对象程序编程（一）== |
