Multithreading Take money

public class Drawdemo {public static void main (string[] args) {Account account = new Account ("12347866", "");D Rawthread D = new Drawthread (account, "Zhang San", +);D rawthread d1 = new Drawthread (account, "John Doe", +);D rawthread d2= new Drawthread (AC Count, "Harry",;d. Start ();d 1.start ();d 2.start ();}}

　

2. Withdrawal thread public class Drawthread extends thread {Private account  Account;private double drawamount;public Drawthread (account account, String name, double drawamount) {super (name); this.account = Account;this.drawamount = Drawamount;} @Overridepublic void Run () {synchronized (account) {if (Account.getbalance () > Drawamount  && Account.getbalance () >= 0) {System.out.println ("sufficient balance," + thread.currentthread (). GetName () + "Remove" + Drawamount + "Yuan"); Try{thread.sleep (1000);} catch (Exception e) {e.printstacktrace ();} Account.setbalance ((Account.getbalance ()-drawamount)); System.out.println ("Balance remaining:" + (Account.getbalance ()));} ELSE{SYSTEM.OUT.PRINTLN ("Insufficient balance, withdraw money failed!!!");}}}

　

3. Entity class public class Account {private String accountno;private double balance;public account () {}public account (String Accountno, double balance) {This.accountno = Accountno;this.balance = balance;} Public String Getaccountno () {return accountno;} public void Setaccountno (String accountno) {this.accountno = Accountno;} Public double GetBalance () {return balance;} public void setbalance (double balance) {this.balance = balance;} @Overridepublic int hashcode () {final int prime = 31;int result = 1;result = Prime * result+ ((Accountno = = null)? 0:ac Countno.hashcode ()); Long temp;temp = Double.doubletolongbits (balance); result = Prime * result + (int) (temp ^ (Temp >&G t;>)); return result;} @Overridepublic boolean equals (Object obj) {if (this = = obj) return true;if (obj = = null) return False;if (GetClass ()! = obj . GetClass ()) return false; Account other = (account) obj;if (Accountno = = null) {if (Other.accountno! = null) return false;} else if (!accountno.equal S (other.accountno)) return false;if (Double.doubletolongbits (balance)! = Double.doubletolongbits (other.balance)) return False;return true; 

Second way: Control shared resources

1. Make a fuss in the entity class, make a synchronous method public class Account {private String accountno;private double balance;public account () {}public account ( String Accountno, double balance) {This.accountno = Accountno;this.balance = balance;} Public String Getaccountno () {return accountno;} public void Setaccountno (String accountno) {this.accountno = Accountno;} Public double GetBalance () {return balance;} public void setbalance (double balance) {this.balance = balance;} @Overridepublic int hashcode () {final int prime = 31;int result = 1;result = Prime * result+ ((Accountno = = null)? 0:ac Countno.hashcode ()); Long temp;temp = Double.doubletolongbits (balance); result = Prime * result + (int) (temp ^ (Temp >&G t;>)); return result;} @Overridepublic boolean equals (Object obj) {if (this = = obj) return true;if (obj = = null) return False;if (GetClass ()! = obj . GetClass ()) return false; Account other = (account) obj;if (Accountno = = null) {if (Other.accountno! = null) return false;} else if (!accountno.equal S (other.accountno)) RetuRN false;if (double.doubletolongbits (balance)! = Double.doubletolongbits (other.balance)) return False;return true; Public synchronized void Drawmoney (double drawamount) {System.out.println (Thread.CurrentThread (). GetName () + "customer came .... Want to take "+drawamount"), if (Balance-drawamount > 0) {System.out.println (Thread.CurrentThread (). GetName () + "Remove:" + Drawamount); try {thread.sleep (+);} catch (Interruptedexception e) {e.printstacktrace ();} Balance-= Drawamount; System.out.println ("Still left:" + balance);} Else{system.out.println ("Balance unworthy now failed");}}} 2. Withdrawal thread public class Drawthread extends thread {Private account Account;private double drawamount;public drawthread (account A Ccount, String name, double drawamount) {super (name); this.account = Account;this.drawamount = Drawamount;} @Overridepublic void Run () {Account.drawmoney (Drawamount);}} 3. Test public class Drawdemo {public static void main (string[] args) {Account account = new Account ("12347866",);D rawt Hread d = new Drawthread (account, "Zhang San", +);D rawthread d1 = new Drawthread (account, "John Doe", +);D rawthread d2= new Drawthread (account, "Harry", +);d. Start ();d 1.start ();d 2.start (); }

//The Third Way, the implementation of the Runnable interface

1. Test start public class Drawdemo {public static void main (string[] args) {Account account = new Account ("12347866",;D) rawthr EAD d = new Drawthread (account, $);D rawthread D1 = new Drawthread (account, $);D rawthread d2 = new Drawthread (account, 100); thread T1 = new Thread (d, "Monkey King"); Thread t2 = new Thread (d1, "Pig"); thread t3 = new Thread (d2, "small white Dragon"); T1.start (); T2.start (); T3.start ();}} 2. Withdrawal thread public class Drawthread implements Runnable {private account account;private double drawamount;public Drawthread (Acc Ount account, double drawamount) {this.account = Account;this.drawamount = Drawamount;} @Overridepublic void Run () {synchronized (account) {if (Account.getbalance () > Drawamount && Account.getbalance () >= 0) {System.out.println ("sufficient balance," + thread.currentthread (). GetName () + "Remove" + Drawamount + "Yuan"); Try{thread.sleep (1000);} catch (Exception e) {e.printstacktrace ();} Account.setbalance ((Account.getbalance ()-drawamount)); System.out.println ("Balance remaining:" + (Account.getbalance ()));} ElSE{SYSTEM.OUT.PRINTLN ("Insufficient balance, withdraw money failed!!!");}} Account.drawmoney (Drawamount);}} 3. Entity class--shared resource public class account {private String accountno;private double balance;public account () {}public account ( String Accountno, double balance) {This.accountno = Accountno;this.balance = balance;} Public String Getaccountno () {return accountno;} public void Setaccountno (String accountno) {this.accountno = Accountno;} Public double GetBalance () {return balance;} public void setbalance (double balance) {this.balance = balance;} @Overridepublic int hashcode () {final int prime = 31;int result = 1;result = Prime * result+ ((Accountno = = null)? 0:ac Countno.hashcode ()); Long temp;temp = Double.doubletolongbits (balance); result = Prime * result + (int) (temp ^ (Temp >&G t;>)); return result;} @Overridepublic boolean equals (Object obj) {if (this = = obj) return true;if (obj = = null) return False;if (GetClass ()! = obj . GetClass ()) return false; Account other = (account) obj;if (Accountno = = null) {if (Other.accountno! = Null) return false;} else if (!accountno.equals (Other.accountno)) return false;if (Double.doubletolongbits (balance)! = Double.doubletolongbits (other.balance)) return False;return true;} Public synchronized void Drawmoney (double drawamount) {//system.out.println (Thread.CurrentThread (). GetName () + " The customer has come .... Want to take "+drawamount"//if (Balance-drawamount > 0) {//system.out.println (Thread.CurrentThread (). GetName () + "Remove:" + Drawamount),//try {//thread.sleep (+),//} catch (Interruptedexception e) {//e.printstacktrace ();//}//balance-= Drawamount;//system.out.println ("Still left:" + balance);////} else{//system.out.println ("The balance unworthy now fails");//}//}}

Fourth: Synchronizing via Reentranlock

Other places as before package Com.ckang.drawmoney;import Java.util.concurrent.locks.reentrantlock;public class Account { Private final Reentrantlock lock = new Reentrantlock ();p rivate String accountno;private double balance;public account () {} Public account (String Accountno, double balance) {This.accountno = Accountno;this.balance = balance;} Public String Getaccountno () {return accountno;} public void Setaccountno (String accountno) {this.accountno = Accountno;} Public double GetBalance () {return balance;} public void setbalance (double balance) {this.balance = balance;} @Overridepublic int hashcode () {final int prime = 31;int result = 1;result = Prime * result+ ((Accountno = = null)? 0:ac Countno.hashcode ()); Long temp;temp = Double.doubletolongbits (balance); result = Prime * result + (int) (temp ^ (Temp >&G t;>)); return result;} @Overridepublic boolean equals (Object obj) {if (this = = obj) return true;if (obj = = null) return False;if (GetClass ()! = obj . GetClass ()) return false; Account Other = (account) obj;if (Accountno = = null) {if (Other.accountno! = null) return false;} else if (!accountno.equals (Other.accountno)) retur N false;if (double.doubletolongbits (balance)! = Double.doubletolongbits (other.balance)) return False;return true; public void Drawmoney (double drawamount) {lock.lock (); Try{system.out.println (Thread.CurrentThread (). GetName () + " The customer has come .... Want to take "+drawamount"), if (Balance-drawamount > 0) {System.out.println (Thread.CurrentThread (). GetName () + "Remove:" + Drawamount); try {thread.sleep (+);} catch (Interruptedexception e) {e.printstacktrace ();} Balance-= Drawamount; System.out.println ("Still left:" + balance);} Else{system.out.println ("The balance unworthy has failed");}} Finally{lock.unlock ();}}}

　　

　

　

　

Multithreading Take money