Java的一些练习

1.飞机票的购买

package com.zaizai.hello.over;

import java.util.Scanner;

public class hello {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("机票原价");
        double price= sc.nextDouble();
        System.out.println("月份");
        int month= sc.nextInt();
        System.out.println("类型（头等舱或者经济舱）");
        String type= sc.next();
        double re=cale(price,month,type);
        System.out.println(re);
    }
    public static double cale(double money,int month,String type) {
        if(month>=5&&month<=10){
            switch(type){
                case"头等舱":
                    money*=0.9;
                    break;
                case"经济舱":
                    money*=0.85;
                    break;
                default:
                    System.out.println("wrong space");
                    money=-1;
                    break;
            }
        }
        else if(month==11||month==12||month>=1&&month<=4){
            switch(type){
                case"头等舱":
                    money*=0.7;
                    break;
                case"经济舱":
                    money*=0.65;
                    break;
                default:
                    System.out.println("wrong space");
                    money=-1;
                    break;
            }
        }
        else {
            System.out.println("wrong month");
            money=-1;
        }
        return money;
    }
}

2.101到200素数的输出

package com.zaizai.hello.text;

public class text2 {
    public static void main(String[] args) {
        int re=0;
        for(int i=101;i<=200;i++){
            re=sushu(i);
            if(re==0){
                System.out.println(i);
            }
        }
    }
    public static int sushu(int a) {
        for(int i=2;i 
package com.zaizai.hello.text;

public class text2_2 {
    public static void main(String[] args) {

        for(int i=101;i<=200;i++){
            boolean flag=true;
            for(int j=2;j