小编fah*_*eem的帖子

我是编程新手,我试图使用Switch case实现HashMaps,用户选择一个选项并添加或删除键.如果用户选择插入键值对的选项1,程序在此之后结束,我不能选择允许用户显示键集等的其他选项.我想编程以在成功案例之后继续执行执行.对不起,我的英语不好.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;


public class HashMapImplementation {
    public static void main(String args[]) throws Exception {
        HashMap<String, String> hashMap = new HashMap<String, String>();
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));


        System.out.println("Please select what you want to do:");
        System.out.println("1. Add Key-Value to HashMap ");
        System.out.println("2. Delete Key-Value from HashMap ");
        System.out.println("3. Display all Keys");
        System.out.println("4. Display all Values");
        System.out.println("5. Display Key-Value Set");
        System.out.println("6. Find a Value in HashMap");
        int c = Integer.parseInt(reader.readLine());
        switch (c) {
            case 1:
                System.out.println("Please …

我最近开始学习python.我正在解决一个问题.

class Person:
    age = 0
    def __init__(self,initial_Age):
        if initial_Age<0:
            age=0
            print("This person is not valid, setting age to 0.")
        else:
            age = initial_Age

    def amIOld(self):
        if(age<13):
            print("You are young.")
        elif(age>=13 and age<18):
            print("You are a teenager.")
        else:
            print("You are old.")
    def yearPasses(self):
        age = age + 1
T=int(input())
for i in range(0,T):
age=int(input())         
p=Person(age)  
p.amIOld()
for j in range(0,3):
    p.yearPasses();        
p.amIOld();
print ("") 

我得到的错误显示如下:

Traceback (most recent call last):
File "solution.py", line 27, in <module>
p.yearPasses();        
File "solution.py", line …