The ultimate weapon system written by list set
User operation
package Demo;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
public class crud {
static List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
public List<Map<String, Object>> add( String name, String password) {
Map<String, Object> map = new HashMap<String, Object>();
int id ;
if(list.size()==0){
id=1;
}
else{
id= new Random().nextInt(1000);
}
map.put("id", id);
map.put("name", name);
map.put("password", password);
list.add(map);
return list;
}
public int delete(String id) {
for (int i = 0; i < list.size(); i++) {
Map<String, Object> map = list.get(i);
if(id.equals(map.get("id").toString())){
list.remove(i);
return 0;
}
}
return 1;
}
public List<Map<String, Object>> show() {
return list;
}
public void update(String updateid, String str) {
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("id", updateid);
//Use split('-') method to divide the string with "-" to form a string array, and then use index [0] to get the value of the first element in the array.
newmap.put("name", str.split("-")[0]);
newmap.put("password", str.split("-")[1]);
for (int i = 0; i < list.size(); i++) {
Map<String, Object> map = list.get(i);
if(updateid.equals(map.get("id").toString())){
list.set(i, newmap);
}
}
}
public void em() {
for (int i = 0; i < list.size(); i++) {
list.remove(i);
}
}
}
Login operation
package Demo;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
public class Login {
static int sum =0;
public static Scanner sc = new Scanner(System.in);
static int i =0;
static crud crud = new crud();
static weapon weapon = new weapon();
public static void main(String[] args) {
int sum =0;
System.out.println("----------Welcome to the ultimate weapon system------------");
System.out.println(" ------1.Sign in---------2.register------");
int index = sc.nextInt();
if(index==1){
//Sign in
while (true) {
System.out.println("Please enter your user name");
String name = sc.next();
System.out.println("Please input your password.");
String pwd = sc.next();
if(name.equals("admin")&&pwd.equals("admin")){
System.out.println("Hello, general! You have obtained the highest authority. The system has a self explosive program. Please use it carefully!");
loginAdmin();
return;
}
List<Map<String, Object>> list = crud.show();
if(list.size()==0){
System.out.println("No users");
main(null);
return;
}
for (int i = 0; i < list.size(); i++) {
if(name.equals(list.get(i).get("name").toString())){
if(pwd.equals(list.get(i).get("password").toString())){
System.out.println("Login successfully");
loginOk();
}
else{
System.out.println("Password error");
sum++;
}
}
else{
System.out.println("User name error");
sum++;
}
}
if(sum==3){
System.out.println("You have made three errors in total...");
main(null);
return;
}
}
}
if(index==2){
//The information of successful registration is stored in the array.
// Two-dimensional array
user_name();
}
}
private static void loginOk() {
System.out.println("--1.View weapons and equipment------2.Weapon selection-----3.launch-----4.Recycling weapons-----0.Sign out");
// 500 guns 10000
// 40 antiaircraft gun 500
// 5000 throwing weapons
String weaponindex = sc.next();
if(weaponindex.equals("1")){
List<Map<String, Object>> list = weapon.showRm();
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
loginOk();
}
if(weaponindex.equals("2")){
boolean t=true;
while(t) {
System.out.println("Select weapon type:");
List<Map<String, Object>> list = weapon.showRm();
for (int i = 0; i < list.size(); i++) {
System.out.println(i+1 + ":");
System.out.println(list.get(i));
}
String type = sc.next();
if(type.equals("1")) {
System.out.println("Please select the number of guns:");
int amount = sc.nextInt();
if(amount>(int)list.get(0).get("Number")) {
boolean a=true;
while(a) {
System.out.println("There are not so many guns to choose from,Please re-enter!");
amount = sc.nextInt();
if(amount<=(int)list.get(0).get("Number")) {
a=false;
}
}
}
System.out.println("Please select the ammunition quantity:");
int ammunition = sc.nextInt();
if(ammunition>(int)list.get(0).get("Ammunition number")) {
boolean a=true;
while(a) {
System.out.println("There is not so much ammunition to choose from,Please re-enter!");
ammunition = sc.nextInt();
if(ammunition<=(int)list.get(0).get("Ammunition number")) {
a=false;
}
}
}
weapon.add(type,amount,ammunition);
}
else if(type.equals("2")) {
System.out.println("Please select the number of anti-aircraft guns:");
int amount = sc.nextInt();
if(amount>(int)list.get(1).get("Number")) {
boolean a=true;
while(a) {
System.out.println("There are not so many antiaircraft guns to choose from,Please re-enter!");
amount = sc.nextInt();
if(amount<=(int)list.get(1).get("Number")) {
a=false;
}
}
}
System.out.println("Please select the number of missiles:");
int ammunition = sc.nextInt();
if(ammunition>(int)list.get(1).get("Missile number")) {
boolean a=true;
while(a) {
System.out.println("There are not so many missiles to choose from,Please re-enter!");
ammunition = sc.nextInt();
if(ammunition<=(int)list.get(1).get("Missile number")) {
a=false;
}
}
}
weapon.add(type,amount,ammunition);
}
else if(type.equals("3")) {
System.out.println("Please select the number of weapons to throw:");
int amount = sc.nextInt();
if(amount>(int)list.get(2).get("Number")) {
boolean a=true;
while(a) {
System.out.println("There are not so many throwing weapons to choose from,Please re-enter!");
amount = sc.nextInt();
if(amount<=(int)list.get(2).get("Number")) {
a=false;
}
}
}
int ammunition = 0;
weapon.add(type,amount,ammunition);
}
System.out.println("Continue selection?[y/n]");
String yn = sc.next();
if(yn.equals("y")||yn.equals("Y")) {
t=true;
}
else if(yn.equals("n")||yn.equals("N")) {
t=false;
}
}
List<Map<String, Object>> listUser = weapon.showRm1();
for (int i = 0; i < listUser.size(); i++) {
System.out.println("Weapons of choice:");
System.out.println(listUser.get(i));
}
loginOk();
}
if(weaponindex.equals("3")){
System.out.println("Please choose to use weapons:");
List<Map<String, Object>> listUsers = weapon.showRm1();
if(listUsers.size()==0) {
System.out.println("No weapons, please choose weapons to fight!");
loginOk();
}
for (int i = 0; i < listUsers.size(); i++) {
System.out.println(i+1 + ":");
System.out.println(listUsers.get(i));
}
int type1 = sc.nextInt();
weapon.div(type1);
loginOk();
}
if(weaponindex.equals("4")){
List<Map<String, Object>> listUsers = weapon.showRm1();
if(listUsers.size()==0) {
System.out.println("No weapons to recycle!");
loginOk();
}
weapon.recycle();
System.out.println("Successful recovery");
loginOk();
}
if(weaponindex.equals("0")){
main(null);
}
}
private static void loginAdmin() {
System.out.println("--1.See------2.Add to-----3.remove------4.change----5 Self detonate----Go back to the previous level/P ");
String logindex = sc.next();
if(logindex.equals("1")){
List<Map<String, Object>> list = crud.show();
if(list.size()==0){
System.out.println("No data yet, please add");
loginAdmin();
}
else{
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
loginAdmin();
}
}
if(logindex.equals("2")){
System.out.println("Please enter a name");
String name = sc.next();
System.out.println("Please input a password");
String password = sc.next();
crud.add(name, password);
System.out.println("Add success");
loginAdmin();
}
if(logindex.equals("3")){
List<Map<String, Object>> list = crud.show();
for (int i = 0; i < list.size(); i++) {
int a=i+1;
System.out.println("number:"+a+list.get(i));
}
if(list.size()==0) {
System.out.println("No users!");
loginAdmin();
}
System.out.println("Please enter the mobile number");
String id= sc.next();
int deletesum =crud.delete(id);
if(deletesum==0){
System.out.println("Delete successful");
loginAdmin();
}
else{
System.out.println("Delete failed");
loginAdmin();
}
}
if(logindex.equals("4")){
int sum=0;
List<Map<String, Object>> list = crud.show();
for (int i = 0; i < list.size(); i++) {
int b=i+1;
System.out.println("Serial number:"+b+list.get(i));
}
if(list.size()==0) {
System.out.println("No users!");
loginAdmin();
}
System.out.println("Please select the number of the data you want to modify");
String updateid = sc.next();
for (int i = 0; i < list.size(); i++) {
if(updateid.equals(list.get(i).get("id").toString())){
System.out.println(list.get(i));
sum++;
}
}
if(sum==1){
System.out.println("Please enter the data content (name) you want to modify-Password)");
String str = sc.next();
crud.update(updateid,str);
System.out.println("Modified success");
loginAdmin();
}else{
System.out.println("The number you entered is wrong. There is no such data at present.");
loginAdmin();
}
}
if(logindex.equals("5")) {
System.out.println("The self explosion program has been started. The system will explode in 5 seconds. Please evacuate as soon as possible (you should not be able to run)!!");
List<Map<String, Object>> list = crud.show();
crud.em();
int a=5;
while(true) {
System.out.println(a--);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(a==0) {
System.out.println("boom，Bang. boom. . . !!!");
main(null);
}
}
}
if(logindex.equals("p")){
main(null);
}
}
private static String user_password( String uname ) {
System.out.println("Please input a password");
String upwd = sc.next();
if(upwd.length()>=4 && upwd.length()<=8 ){
crud.add(uname, upwd);
System.out.println("login was successful");
main(null);
}
else{
System.out.println("Please enter the correct 4-8 Bit length password");
user_password(uname);
}
return null;
}
private static String user_name() {
System.out.println("enter one user name");
String uname = sc.next();
if(uname.length()>=4 && uname.length()<=8 ){
user_password(uname);
}
else{
System.out.println("Please enter the correct 4-8 Bit user name");
user_name();
}
return null;
}
}
Weapon operation
package Demo;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Scanner;
public class weapon {
static int gun = 500;
static int archibald = 40;
static int grenade = 5000;
static int ammunition1 = 10000;
static int ammunition2 = 500;
public static Scanner sc = new Scanner(System.in);
static List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
static List<Map<String, Object>> listUser = new ArrayList<Map<String,Object>>();
static{
Map<String, Object> map1 = new HashMap<String, Object>();
map1.put("Number", gun);
map1.put("type", "firearms");
map1.put("Ammunition number", ammunition1);
Map<String, Object> map2 = new HashMap<String, Object>();
map2.put("Number", archibald);
map2.put("type", "Antiaircraft gun");
map2.put("Missile number", ammunition2);
Map<String, Object> map3 = new HashMap<String, Object>();
map3.put("Number", grenade);
map3.put("type", "throw weapon");
list.add(map1);
list.add(map2);
list.add(map3);
}
public List<Map<String, Object>> showRm() {
return list;
}
public List<Map<String, Object>> showRm1() {
return listUser;
}
public void add(String type, int amount, int ammunition) {
if(type.equals("1")){
int a =(int)list.get(0).get("Number")-amount;
int b =(int)list.get(0).get("Ammunition number")-ammunition;
Map<String, Object> map = new HashMap<String, Object>();
map.put("Number", a);
map.put("type", "firearms");
map.put("Ammunition number", b);
list.set(0, map);
}
if(type.equals("2")){
int a =(int)list.get(1).get("Number")-amount;
int b =(int)list.get(1).get("Missile number")-ammunition;
Map<String, Object> map = new HashMap<String, Object>();
map.put("Number", a);
map.put("type", "Antiaircraft gun");
map.put("Missile number", b);
list.set(1, map);
}
if(type.equals("3")){
int a =(int)list.get(2).get("Number")-amount;
Map<String, Object> map = new HashMap<String, Object>();
map.put("Number", a);
map.put("type", "throw weapon");
list.set(2, map);
}
Map<String, Object> map = new HashMap<String, Object>();
if(type.equals("1")) {
map.put("Choose weapon type", "firearms");
map.put("Number", amount);
map.put("Ammunition number", ammunition);}
else if(type.equals("2")) {
map.put("Choose weapon type", "Antiaircraft gun");
map.put("Number", amount);
map.put("Missile number", ammunition);}
else if(type.equals("3")) {
map.put("Choose weapon type", "throw weapon");
map.put("Number", amount);
}
listUser.add(map);
}
public void div(int type1) {
if("firearms".equals(listUser.get(type1-1).get("Choose weapon type").toString())) {
System.out.println("Please select the number of guns to use:");
int n = sc.nextInt();
if(n>(int)listUser.get(type1-1).get("Number")) {
boolean a=true;
while(a) {
System.out.println("Guns are not enough,Please re-enter!");
n = sc.nextInt();
if(n<=(int)listUser.get(type1-1).get("Number")) {
a=false;
}
}
}
System.out.println("Please select the quantity of ammunition to use:");
int d = sc.nextInt();
if(d>(int)listUser.get(type1-1).get("Ammunition number")) {
boolean a=true;
while(a) {
System.out.println("Ammunition is not enough.,Please re-enter!");
d = sc.nextInt();
if(d<=(int)listUser.get(type1-1).get("Ammunition number")) {
a=false;
}
}
}
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("Choose weapon type", "firearms");
newmap.put("Number",(int)listUser.get(type1-1).get("Number")-n);
newmap.put("Ammunition number",(int)listUser.get(type1-1).get("Ammunition number")-d);
listUser.set(type1-1, newmap);
System.out.println("Launch:");
boolean t=true;
int j=0;
while(t) {
System.out.print("Da");
n--;
int a=(int) (Math.random()*10);
if(a==6) {
j++;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(n==0) {
System.out.println(" Launch completed,Common hit"+j+"Enemy!");
t=false;
}
}
}
else if("Antiaircraft gun".equals(listUser.get(type1-1).get("Choose weapon type").toString())) {
System.out.println("Please select the number of antiaircraft guns to use:");
int n = sc.nextInt();
if(n>(int)listUser.get(type1-1).get("Number")) {
boolean a=true;
while(a) {
System.out.println("Not enough antiaircraft guns,Please re-enter!");
n = sc.nextInt();
if(n<=(int)listUser.get(type1-1).get("Number")) {
a=false;
}
}
}
System.out.println("Please select the number of missiles to use:");
int d = sc.nextInt();
if(d>(int)listUser.get(type1-1).get("Missile number")) {
boolean a=true;
while(a) {
System.out.println("Missile is not enough,Please re-enter!");
d = sc.nextInt();
if(d<=(int)listUser.get(type1-1).get("Missile number")) {
a=false;
}
}
}
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("Choose weapon type", "Antiaircraft gun");
newmap.put("Number",(int)listUser.get(type1-1).get("Number")-n);
newmap.put("Missile number",(int)listUser.get(type1-1).get("Missile number")-d);
listUser.set(type1-1, newmap);
System.out.println("Launch:");
boolean t=true;
int j = 0;
while(t) {
System.out.print("Bombardment");
n--;
int a=(int) (Math.random()*10);
if(a==6) {
j++;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(n==0) {
System.out.println("Launch completed,Common hit"+j+"Enemy!");
t=false;
}
}
}
else if("throw weapon".equals(listUser.get(type1-1).get("Choose weapon type").toString())) {
System.out.println("Please select the number of throwing weapons to use:");
int n = sc.nextInt();
if(n>(int)listUser.get(type1-1).get("Number")) {
boolean a=true;
while(a) {
System.out.println("Not enough throwing weapons,Please re-enter!");
n = sc.nextInt();
if(n<=(int)listUser.get(type1-1).get("Number")) {
a=false;
}
}
}
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("Choose weapon type", "throw weapon");
newmap.put("Number",(int)listUser.get(type1-1).get("Number")-n);
listUser.set(type1-1, newmap);
System.out.println("Throw:");
boolean t=true;
int j = 0;
while(t) {
System.out.print("boom ");
n--;
int a=(int) (Math.random()*10);
if(a==6) {
j++;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(n==0) {
System.out.println("Throw up,Common hit"+j+"Enemy!");
t=false;
}
}
}
}
public void recycle() {
for (int i = 0; i < listUser.size(); i++) {
if("firearms".equals(listUser.get(i).get("Choose weapon type").toString()))
{
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("type", "firearms");
newmap.put("Number",(int)listUser.get(i).get("Number")+(int)list.get(0).get("Number"));
newmap.put("Ammunition number",(int)listUser.get(i).get("Ammunition number")+(int)list.get(0).get("Ammunition number"));
list.set(0, newmap);
}
else if("Antiaircraft gun".equals(listUser.get(i).get("Choose weapon type").toString()))
{
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("type", "Antiaircraft gun");
newmap.put("Number",(int)listUser.get(i).get("Number")+(int)list.get(1).get("Number"));
newmap.put("Missile number",(int)listUser.get(i).get("Missile number")+(int)list.get(1).get("Missile number"));
list.set(1, newmap);
}
else if("throw weapon".equals(listUser.get(i).get("Choose weapon type").toString()))
{
Map<String, Object> newmap = new HashMap<String, Object>();
newmap.put("type", "throw weapon");
newmap.put("Number",(int)listUser.get(i).get("Number")+(int)list.get(2).get("Number"));
list.set(2, newmap);
}
}
listUser.clear();
}
}
Collection summary
1. list set
Create: List < generic > List = new ArrayList < generic > ();
Add method: add()
list list= new ArrayList();
list.add("hello");
Update method: set(index, element)
String str = "Hello Java!"
list.set(0,str)
Remove method: remove(index);
list.add("2");
list.remove(0);
Get method: get(index);
list.get(0);
Advanced: List < map < string, Object > > List = new ArrayList < map < string, Object > > ();
Add: Map < string, Object > MAP1 = new HashMap < string, Object > ();
map1.put("quantity", gun);
map1.put("category", "gun");
map1.put("ammunition number", ammunition1);
list.add(map1);
list.get(0).get("quantity"); / / the value gun corresponding to the first quantity in the list collection array;
2. map set
Create: Map < K, V > map = new HashMap < K, V > ();
k is the key value, v is the corresponding value, and the corresponding v value can be found according to k value.
Such as:
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
Map<String, Object> map1 = new HashMap<String, Object>();
map1.put("Number", gun);
map1.put("type", "firearms");
map1.put("Ammunition number", ammunition1);
Map<String, Object> map2 = new HashMap<String, Object>();
map2.put("Number", archibald);
map2.put("type", "Antiaircraft gun");
map2.put("Missile number", ammunition2);
Map<String, Object> map3 = new HashMap<String, Object>();
map3.put("Number", grenade);
map3.put("type", "throw weapon");
list.add(map1);
list.add(map2);
list.add(map3);
list.get(0).get("Number");//The value gun corresponding to the number of the first in the list set array;
Add method: put();
Map<String,Object> map = new HashMap<String,Object>();
map.put();