snipplrCallback({"id":69567,"title":"basic-database-in-java-updated-version","source":"
  1. package<\/span> com.santi<\/span>;<\/span><\/div><\/li>
  2.  <\/div><\/li>
  3. import<\/span> java.io.BufferedReader<\/span>;<\/span><\/div><\/li>
  4. import<\/span> java.io.InputStreamReader<\/span>;<\/span><\/div><\/li>
  5. import<\/span> java.util.ArrayList<\/span>;<\/span><\/div><\/li>
  6. import<\/span> java.util.Date<\/span>;<\/span><\/div><\/li>
  7.  <\/div><\/li>
  8. public<\/span> class<\/span> Main {<\/span><\/div><\/li>
  9.  <\/div><\/li>
  10.  <\/div><\/li>
  11. \tpublic<\/span> static<\/span> void<\/span> main(<\/span>String<\/span><\/a>[<\/span>]<\/span> args)<\/span> {<\/span><\/div><\/li>
  12. \t\t\/\/declaration of arraylist-type variables<\/span><\/div><\/li>
  13. \t\tArrayList<<\/span>String><\/span> names=<\/span>new<\/span> ArrayList<<\/span>String><\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  14. \t\tArrayList<<\/span>String><\/span> last_names=<\/span>new<\/span> ArrayList<<\/span>String><\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  15. \t\tArrayList<<\/span>String><\/span> phones=<\/span>new<\/span> ArrayList<<\/span>String><\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  16. \t\tArrayList<<\/span>String><\/span> emails=<\/span>new<\/span> ArrayList<<\/span>String><\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  17. \t\t\/\/declaration of a Date-type variable<\/span><\/div><\/li>
  18. \t\tDate<\/span><\/a> date1 =<\/span> new<\/span> Date<\/span><\/a>(<\/span>)<\/span>;<\/span><\/div><\/li>
  19. \t\t\/\/rest of auxiliary variables<\/span><\/div><\/li>
  20. \t\tint<\/span> cont=<\/span>0<\/span>;<\/span><\/div><\/li>
  21. \t\tboolean<\/span> a =<\/span>true<\/span>;<\/span><\/div><\/li>
  22. \t\t\/\/end of variable declarations<\/span><\/div><\/li>
  23. \t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Program started on "<\/span> +<\/span> date1)<\/span>;<\/span><\/div><\/li>
  24. \t\t\/\/main while loop<\/span><\/div><\/li>
  25. \t\twhile<\/span> (<\/span>a==<\/span>true<\/span>)<\/span>{<\/span><\/div><\/li>
  26. \t\t\tif<\/span>(<\/span>names.size<\/span>(<\/span>)<\/span>==<\/span>0<\/span> &&<\/span> last_names.size<\/span>(<\/span>)<\/span>==<\/span>0<\/span> &&<\/span> phones.size<\/span>(<\/span>)<\/span>==<\/span>0<\/span> &&<\/span> emails.size<\/span>(<\/span>)<\/span>==<\/span>0<\/span>)<\/span> System<\/span><\/a>.out<\/span>.flush<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  27. \t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Please select an option: "<\/span>)<\/span>;<\/span><\/div><\/li>
  28. \t\tString<\/span><\/a> option2 =<\/span> getInput(<\/span>"1. Add contact."<\/span> +<\/span><\/div><\/li>
  29. \t\t\t\t"2. Show contacts."<\/span> +<\/span><\/div><\/li>
  30. \t\t\t\t"3. Remove contact. 0. Exit program. : "<\/span>)<\/span>;<\/span><\/div><\/li>
  31. \t\tint<\/span> opt=<\/span>Integer<\/span><\/a>.parseInt<\/span>(<\/span>option2)<\/span>;<\/span><\/div><\/li>
  32. \t\tswitch<\/span> (<\/span>opt)<\/span> {<\/span><\/div><\/li>
  33. \t\tcase<\/span> 1<\/span>:<\/span><\/div><\/li>
  34. \t\t\t\tnames.add<\/span>(<\/span>getInput(<\/span>"Name: "<\/span>)<\/span>)<\/span>;<\/span><\/div><\/li>
  35. \t\t\t\tlast_names.add<\/span>(<\/span>getInput(<\/span>"Last name: "<\/span>)<\/span>)<\/span>;<\/span><\/div><\/li>
  36. \t\t\t\tphones.add<\/span>(<\/span>getInput(<\/span>"Phone number: "<\/span>)<\/span>)<\/span>;<\/span><\/div><\/li>
  37. \t\t\t\temails.add<\/span>(<\/span>getInput(<\/span>"Email: "<\/span>)<\/span>)<\/span>;<\/span><\/div><\/li>
  38.  <\/div><\/li>
  39. \t\t\tbreak<\/span>;<\/span><\/div><\/li>
  40. \t\tcase<\/span> 2<\/span>:<\/span><\/div><\/li>
  41. \t\t\tif<\/span> (<\/span>names.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> last_names.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> phones.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> emails.isEmpty<\/span>(<\/span>)<\/span>)<\/span> {<\/span><\/div><\/li>
  42. \t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"There are no contacts yet!"<\/span>)<\/span>;<\/span><\/div><\/li>
  43. \t\t\t}<\/span><\/div><\/li>
  44. \t\t\telse<\/span> {<\/span><\/div><\/li>
  45. \t\t\t\tfor<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> names.size<\/span>(<\/span>)<\/span>;<\/span> i++<\/span>)<\/span> {<\/span><\/div><\/li>
  46. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>i+<\/span>1<\/span> +<\/span> "- "<\/span>)<\/span>;<\/span><\/div><\/li>
  47. \t\t\t\t\tString<\/span><\/a> aux_name =<\/span> names.get<\/span>(<\/span>i)<\/span>;<\/span><\/div><\/li>
  48. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>aux_name)<\/span>;<\/span><\/div><\/li>
  49. \t\t\t\t\tString<\/span><\/a> aux_last_name =<\/span> last_names.get<\/span>(<\/span>i)<\/span>;<\/span><\/div><\/li>
  50. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>aux_last_name)<\/span>;<\/span><\/div><\/li>
  51. \t\t\t\t\tString<\/span><\/a> aux_phone =<\/span> phones.get<\/span>(<\/span>i)<\/span>;<\/span><\/div><\/li>
  52. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>aux_phone)<\/span>;<\/span><\/div><\/li>
  53. \t\t\t\t\tString<\/span><\/a> aux_email =<\/span> emails.get<\/span>(<\/span>i)<\/span>;<\/span><\/div><\/li>
  54. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>aux_email)<\/span>;<\/span><\/div><\/li>
  55. \t\t\t\t}<\/span><\/div><\/li>
  56.  <\/div><\/li>
  57. \t\t}<\/span><\/div><\/li>
  58. \t\t\tbreak<\/span>;<\/span><\/div><\/li>
  59.  <\/div><\/li>
  60. \t\tcase<\/span> 3<\/span>:<\/span><\/div><\/li>
  61. \t\t\tif<\/span> (<\/span>names.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> last_names.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> phones.isEmpty<\/span>(<\/span>)<\/span> &&<\/span> emails.isEmpty<\/span>(<\/span>)<\/span>)<\/span> {<\/span><\/div><\/li>
  62. \t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"There are no contacts yet!"<\/span>)<\/span>;<\/span><\/div><\/li>
  63. \t\t\t}<\/span><\/div><\/li>
  64. \t\t\telse<\/span> if<\/span>(<\/span>names.size<\/span>(<\/span>)<\/span>==<\/span>1<\/span>)<\/span>{<\/span><\/div><\/li>
  65. \t\t\t\tnames.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  66. \t\t\t\tlast_names.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  67. \t\t\t\tphones.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  68. \t\t\t\temails.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  69. \t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"All contacts succesfully erased! No contacts in database anymore."<\/span>)<\/span>;<\/span><\/div><\/li>
  70. \t\t\t\tbreak<\/span>;<\/span><\/div><\/li>
  71. \t\t\t}<\/span><\/div><\/li>
  72. \t\t\telse<\/span> {<\/span><\/div><\/li>
  73. \t\t\t\tcont=<\/span>0<\/span>;<\/span><\/div><\/li>
  74. \t\t\t\tString<\/span><\/a> option=<\/span>getInput(<\/span>"1.REMOVE BY NAME. 2.REMOVE ALL. : "<\/span>)<\/span>;<\/span><\/div><\/li>
  75. \t\t\t\tint<\/span> option3 =<\/span> Integer<\/span><\/a>.parseInt<\/span>(<\/span>option)<\/span>;<\/span><\/div><\/li>
  76. \t\t\t\tswitch<\/span> (<\/span>option3)<\/span>{<\/span><\/div><\/li>
  77. \t\t\t\tcase<\/span> 1<\/span>:<\/span><\/div><\/li>
  78. \t\t\t\tString<\/span><\/a> chc =<\/span> getInput(<\/span>"Please enter the name of the contact you wish to erase: "<\/span>)<\/span>;<\/span><\/div><\/li>
  79. \t\t\t\tfor<\/span> (<\/span>String<\/span><\/a> name :<\/span> names)<\/span> {<\/span><\/div><\/li>
  80. \t\t\t\t\tif<\/span> (<\/span>chc.equals<\/span>(<\/span>name)<\/span>)<\/span> {<\/span><\/div><\/li>
  81. \t\t\t\t\t\t\/\/remove all fields of data in that position<\/span><\/div><\/li>
  82. \t\t\t\t\t\tnames.remove<\/span>(<\/span>chc)<\/span>;<\/span><\/div><\/li>
  83. \t\t\t\t\t\tlast_names.remove<\/span>(<\/span>chc)<\/span>;<\/span><\/div><\/li>
  84. \t\t\t\t\t\tphones.remove<\/span>(<\/span>chc)<\/span>;<\/span><\/div><\/li>
  85. \t\t\t\t\t\temails.remove<\/span>(<\/span>chc)<\/span>;<\/span><\/div><\/li>
  86. \t\t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Contact succesfully erased!"<\/span>)<\/span>;<\/span><\/div><\/li>
  87. \t\t\t\t\t\tbreak<\/span>;<\/span><\/div><\/li>
  88. \t\t\t\t\t}<\/span>cont++;<\/span><\/div><\/li>
  89. \t\t\t\t}<\/span><\/div><\/li>
  90. \t\t\t\tif<\/span> (<\/span>cont==<\/span>names.size<\/span>(<\/span>)<\/span>)<\/span> {<\/span><\/div><\/li>
  91. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"WARNING: No matches between provided name and stored names. Remember: this program is case-sensitive!"<\/span>)<\/span>;<\/span><\/div><\/li>
  92. \t\t\t\t}<\/span><\/div><\/li>
  93.  <\/div><\/li>
  94.  <\/div><\/li>
  95. \t\t\t\tbreak<\/span>;<\/span><\/div><\/li>
  96. \t\t\t\tcase<\/span> 2<\/span>:<\/span><\/div><\/li>
  97. \t\t\t\t\tnames.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  98. \t\t\t\t\tlast_names.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  99. \t\t\t\t\tphones.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  100. \t\t\t\t\temails.clear<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  101. \t\t\t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"All contacts succesfully erased! No contacts in database anymore."<\/span>)<\/span>;<\/span><\/div><\/li>
  102. \t\t\t\t\tbreak<\/span>;<\/span><\/div><\/li>
  103. \t\t\t\t}<\/span><\/div><\/li>
  104. \t\t\t\tbreak<\/span>;<\/span><\/div><\/li>
  105. \t\t\t}<\/span><\/div><\/li>
  106. \t\t\tbreak<\/span>;<\/span><\/div><\/li>
  107. \t\tcase<\/span> 0<\/span>:<\/span><\/div><\/li>
  108. \t\t\tDate<\/span><\/a> date2 =<\/span> new<\/span> Date<\/span><\/a>(<\/span>)<\/span>;<\/span><\/div><\/li>
  109. \t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Program ended on "<\/span> +<\/span> date2)<\/span>;<\/span><\/div><\/li>
  110. \t\t\tSystem<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Developed by Santi Pagola."<\/span>)<\/span>;<\/span><\/div><\/li>
  111. \t\t\ta=<\/span>false<\/span>;<\/span><\/div><\/li>
  112. \t\t\tbreak<\/span>;<\/span><\/div><\/li>
  113. \t\t}<\/span><\/div><\/li>
  114.  <\/div><\/li>
  115. \t}<\/span><\/div><\/li>
  116.  <\/div><\/li>
  117. }<\/span><\/div><\/li>
  118.  <\/div><\/li>
  119. \tprivate<\/span> static<\/span> String<\/span><\/a> getInput(<\/span>String<\/span><\/a> prompt)<\/span> {<\/span><\/div><\/li>
  120. \t\tBufferedReader<\/span><\/a> stdin =<\/span> new<\/span> BufferedReader<\/span><\/a>(<\/span><\/div><\/li>
  121. \t\t\t\tnew<\/span> InputStreamReader<\/span><\/a>(<\/span>System<\/span><\/a>.in<\/span>)<\/span>)<\/span>;<\/span><\/div><\/li>
  122.  <\/div><\/li>
  123. \t\tSystem<\/span><\/a>.out<\/span>.print<\/span>(<\/span>prompt)<\/span>;<\/span><\/div><\/li>
  124. \t\tSystem<\/span><\/a>.out<\/span>.flush<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  125.  <\/div><\/li>
  126. \t\ttry<\/span> {<\/span><\/div><\/li>
  127. \t\t\treturn<\/span> stdin.readLine<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  128. \t\t}<\/span> catch<\/span> (<\/span>Exception<\/span><\/a> e)<\/span> {<\/span><\/div><\/li>
  129. \t\t\treturn<\/span> "Error: "<\/span> +<\/span> e.getMessage<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>
  130. \t\t}<\/span><\/div><\/li>
  131.  <\/div><\/li>
  132. \t}<\/span><\/div><\/li>
  133.  <\/div><\/li>
  134. }<\/span><\/div><\/li><\/ol><\/pre>","link":"https:\/\/snipplr.com\/view\/69567\/basic-database-in-java-updated-version"});