Basic programming exercises for NLP, random, and arraylist

Generate 6 1 ~ Random integer between 33, add to the set, and traverse

Package arraylist; import java. util. arraylist; import java. util. Random;/** train of thought * 6 ---> 6. fori * 1 ~ Between 33 ---> XXX. nextint (33) + 1; * random integer ---> random xxx = new random (); * Add to set ---> arraylist <integer> xxx = new arraylist <> (); list. add (); * traverse ---> XXX. fori; ---> list. get (INDEX); ***/public class arraylist_4 {public static void main (string [] ARGs) {random r = new random (); arraylist <integer> List = new arraylist <> (); For (INT I = 0; I <6; I ++) {int num = R. nextint (33) + 1; List. add (Num);} system. out. println (list); For (INT I = 0; I <list. size (); I ++) {system. out. print (list. get (I) + "");}}}

Customize four student objects, add them to the set, and traverse

Package arraylist; import class_objiect.student; import Java. util. arraylist;/** train of thought * Custom four student objects ---> Student one = new student (); * student two = new student (); * student three = new student (); * student four = new student (); * Add to set ---> arraylist <student> List = new arraylist <> (); & list. add (content); * traverse ---> list. fori ---> list. get (INDEX); **/public class arraylist_5 {public static void main (string [] ARGs) {arraylist <student> List = new arraylist <student> (); student one = new student ("Andy", 18); student two = new student ("bill", 19); student three = new student ("Lily", 32 ); student four = new student ("Jane", 12); list. add (one); list. add (two); list. add (three); list. add (four); For (INT I = 0; I <list. size (); I ++) {system. out. println ("name:" + list. get (I ). getname () + "" + "Age:" + list. get (I ). getage () + "years old ");}}}

Define a method to print a set in a specified format (arraylist type as a parameter), use {} to expand the set, and use @ to separate each element. For the format, see {element @ element }.

Package arraylist; import Java. util. arraylist;/** train of thought * arraylist <data type> xxx = new arraylistanbul <> (); **/public class arraylist_6 {public static void main (string [] ARGs) {// create a collection arraylist <integer> List = new arraylist <> (); // Add an element list. add (1); list. add (3); list. add (5); list. add (7); // call method print (list);} public static void print (arraylist <integer> List) {system. out. print ("{"); // print {for (INT I = 0; I <list. size (); I ++) {if (I = List. size ()-1) {system. out. print (list. get (I); // print the number} else {system. out. print (list. get (I) + "@"); // print "number @"} system. out. println ("}"); // print }}}

Definition 1 ~ Between 30 (including 1 and 30), all methods of the even Element Set (arraylist type as return value)

Package arraylist; import Java. util. arraylist; import Java. util. random;/** train of thought * between 1-30 ---> XXX. nextint (30) + 1; * All even elements ---> if (I % 2 = 0) {even number} * method public static string method (arraylist <string> List) **/public class arraylist_7 {public static void main (string [] ARGs) {arraylist <integer> List = new arraylist <> (); For (INT I = 1; I <= 30; I ++) {if (I % 2 = 0) {list. add (I) ;}} system. out. println (list );}}

At the beginning of the game, an integer number ranging from 1 to is randomly generated. The player guesses a number guessnumber, which will compare with the number. The system prompts that the number is large or small until the player guesses it and the game ends.

Package random;/* random thought ---> random r = new random (); 1 ~ 100 --> int number = R. nextint (100) + 1; conjecture ---> expect SC = new expect (system. in); ---> int guessnumber = SC. nextint (); If (guessnumber> Number) {large} If (guessnumber <number) {small} If (guessnumber = number) {guessed it} guessnumber should be a loop; **/import Java. util. random; import Java. util. random; public class random_4 {public static void main (string [] ARGs) {random r = new random (); random SC = new random (system. in); int number = R. nextint (100) + 1; system. out. println ("Enter:"); For (INT I = 0; I <100; I ++) {int guessnumber = SC. nextint (); If (guessnumber> Number) {system. out. println ("big");} else if (guessnumber <number) {system. out. println ("");} else if (guessnumber = Number) {system. out. println ("guessed ");}}}}

Basic programming exercises for NLP, random, and arraylist