Java-collection framework-ArrayList from scratch in Android Development

[Java] package test; import java. io. bufferedReader; import java. io. inputStreamReader; import java. util. *;/** Author: Zhong Zhigang * function: ArrayList of Collection framework * Time: * 1. List structure: ArrayList, sorted List, Vector, Stack; * 2. Map Structure: hashMap, Hashtable; * 3, set structure: HastSet, TreeSet; * 4, Queue structure: queue interface */public class Collection framework {/*** @ param args */public static void main (String [] args) throws Exception {// ArrayList <Clerk> al = new ArrayList <Clerk> (); clerc1 = new Clerk ("", 50,100 0); al. add (c1); // add to the end Clerk c3 = new Clerk ("Wu Yong", 45,200 0); al. add (c3); // add it to the end of al. add (c3); // you can add the same object System. out. println ("al. lenght = "+ al. size (); Clerk c2 = new Clerk ("Wu Song", 30,100 04.4f); al. add (0, c2); // add it to the specified location. The original location will be shown as "al. remove (3); // Delete the corresponding object // System. out. println (al. get (1 ). getName (); for (Clerc: al) {// System. out. println (c. GetName ();} // use a class to manage employee information. EmpManage emp = new EmpManage (); // read the input BufferedReader br = new BufferedReader (new InputStreamReader (System. in); while (true) {System. out. println ("follow the prompts"); System. out. println ("1: add an employee"); System. out. println ("2: Find an employee"); System. out. println ("3: modifying an employee's salary"); System. out. println ("4: deleting an employee"); System. out. println ("6: Find all employees"); System. out. println ("5: Exit program"); String op = br. read Line (); if (op. equals ("1") {System. out. println ("Enter the name:"); String name = br. readLine (); System. out. println ("Enter age:"); int age = Integer. valueOf (br. readLine (); System. out. println ("Enter the salary:"); float sal = Float. parseFloat (br. readLine (); Clerk c = new Clerk (name, age, sal); emp. addEmp (c); // System. out. println ("successfully added");} else if (op. equals ("2") {System. out. println ("Enter employee name"); String qname = br. readLine (); Emp.info (qname);} else if (op. equals ("3") {System. out. println ("enter the name of the employee to be modified:"); String uname = br. readLine (); System. out. println ("Enter the salary to be modified:"); float newsal = Float. parseFloat (br. readLine (); emp. updateSal (uname, newsal); // System. out. println ("modified successfully");} else if (op. equals ("4") {System. out. println ("enter the name of the employee to be deleted:"); String dname = br. readLine (); emp. delEmp (dname); // System. out. println ("deleted successfully");} else If (op. equals ("5") {System. exit (0);} else if (op. equals ("6") {emp. queal () ;}// queue list. serializable linked list // sorted list ll = new employee list () ;}} class EmpManage {// employee management class private ArrayList <Clerk> al = null; public EmpManage () {al = new ArrayList <Clerk> ();} public void queal () {for (Clerk c: al) {System. out. println ("employee name:" + c. getName () + ", salary:" + c. getSal () + ", age:" + c. getAge () ;}// add employee public void DdEmp (Clerc) {al. add (c) ;}// Delete employee public void delEmp (String name) {boolean B = false; for (Clerc: al) {if (c. getName (). equals (name) {// String type data is compared with the address al with =. remove (c); B = true; break;} if (! B) {System. out. println ("");} else {System. out. println ("deleted successfully") ;}// display employee information public void info (String name) {boolean B = false; for (int I = 0; I <al. size (); I ++) {Clerc = al. get (I); if (c. getName (). equals (name) {B = true; System. out. println ("your employee:" + c. getName () + ", salary:" + c. getSal () + ", age:" + c. getAge (); break ;}} if (! B) {System. out. println ("");} else {System. out. println ("query succeeded") ;}// modify employee salary public void updateSal (String name, float sal) {boolean B = false; for (Clerc: al) {if (c. getName (). equals (name) {c. setSal (sal); B = true ;}} if (! B) {System. out. println ("");} else {System. out. println ("modified successfully") ;}} class Clerk {// employee class private String name; public String getName () {return name;} public void setName (String name) {this. name = name;} public int getAge () {return age;} public void setAge (int age) {this. age = age;} public float getSal () {return sal;} public void setSal (float sal) {this. sal = sal;} private int age; private float sal; public Clerk (String name, int age, float sal) {this. age = age; this. name = name; this. sal = sal ;}}