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37afcbe | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | Write the method
public static void start()
which initialises the HashMap object needed in the phone book and prints a menu,
where the user can choose which operation to perform.
The program then calls either the method
- addNumber,
- findNumber or
- listBook.
It is not necessary to define the methods, it is sufficient to call them.
All methods get a HashMap object as a parameter.
An example of program execution:
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 1
Name: Pete
Number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 1
Name: Jack
Number: 54321
1. Add number
2. Find number
3. List numbers
0. Exit
Choice: 3
Name: Jack, number: 54321
Name: Pete, number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 2
Name: Pete
Number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 0
================================================
import java.util.Random;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Collections;
import java.util.ArrayList;
import java.util.Scanner;
public class Test{
public static void main(String[] args){
final Random r = new Random();
// <hide>
String[] s = {"1","Pete","12345","1","Jack","54321", "1", "Maya", "99999", "3", "2", "Pete", "2", "Jack", "0"};
Scanner.setStream(s);
start();
}
//q22
public static void start() {
HashMap<String, String> numbers = new HashMap<>();
Scanner reader = new Scanner(System.in);
while (true) {
// Options Menu
System.out.println("1. Add number");
System.out.println("2. Find number");
System.out.println("3. List numbers");
System.out.println("0. Exit");
// User inputs what 'option' they want
System.out.print("Option: ");
int option = Integer.parseInt(reader.nextLine());
// Exit if option is 0
if (option == 0) {
break;
}
// Add Number if option is 1
else if (option == 1) {
addNumber(numbers);
}
else if (option == 2) {
findNumber(numbers);
}
else if (option == 3) {
listBook(numbers);
}
// if none of the options exist - continue. no printouts
else {
continue;
}
// print 1 extra line separating subsequent option selections
System.out.println("");
}
}
}
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 1
Name: Pete
Number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 1
Name: Jack
Number: 54321
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 1
Name: Maya
Number: 99999
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 3
Name: Jack, number: 54321
Name: Maya, number: 99999
Name: Pete, number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 2
Name: Pete
Number: 12345
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 2
Name: Jack
Number: 54321
1. Add number
2. Find number
3. List numbers
0. Exit
Option: 0
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