[Java] 猛虎 ThreadTest

ThreadTest
public class ThreadTest{
    public static void main(String args[]){
        System.out.println("Hello Word");
        String tname = Thread.currentThread().getName();
        System.out.println(tname);
        int tnumber = Thread.activeCount();
        System.out.println(tnumber);
    }
}

Thread.currentThread().getName();
取得目前執行序名稱

Thread.activeCount();
取得目前執行序有多少可用





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取自於 猛虎出閘 6


ThreadTest4
public class ThreadTest4{
    public static void main(String args[]){
        HelloTheard r1 = new HelloTheard();
        HelloTheard r2 = new HelloTheard();
        Thread t1 = new Thread(r1, "T1");
        Thread t2 = new Thread(r2, "T2");
        t1.start();
        t2.start();
       
    }
}

class HelloTheard extends Thread{
    public void run(){
        for(int i = 1 ; i <= 10 ; i++){
            String tname = Thread.currentThread().getName();
            System.out.println(i+" "+tname);
        }
    }
}


Thread t1 = new Thread(r1, "T1");
Thread t2 = new Thread(r2, "T2");
建立Thread物件


class HelloTheard implements Runnable{
    public void run(){
        for(int i = 1 ; i <= 10 ; i++){
            String tname = Thread.currentThread().getName();
            System.out.println(i+" "+tname);
        }
    }
}

Thread                                           Runnable
 

 -----------------------------------------------------------------------------------------------------------------------
class FatherThead implements Runnable{
        public void run(){
            System.out.println("Go Home");
            System.out.println("standardBath");
            System.out.println("No Fire");
            System.out.println("Cell phone");
            Thread worker = new Thread(new WorkerThread());
            System.out.println("Waite");
            worker.start();
            [                                                     ]
            System.out.println("beingBath");
            System.out.println("OverBath");
        }
}

class WorkerThread implements Runnable{
    public void run(){
        System.out.println("fire trantfor");
        try{
            for(int i = 1 ; i <=5 ; i++){
                Thread.sleep(1000);
                System.out.println(i + "min");
            }
        }catch(InterruptedException ie){
            System.out.println("AcError");
        }
       
        System.out.println("\nfire is come home\nfire is over\n");
    }
}

public class Shower{
    public static void main(String args[]){
        Thread father = new Thread(new FatherThead());
        father.start();
    }
}
---------------------
Go Home
standard Bath
No Fire
Cell phone
Waite
beingBath
OverBath
fire trantfor
1min
2min
3min
4min
5min

fire is come home
fire is over
-------------
[   ] 加上Thread.yied(); 後

Go Home
standardBath
No Fire
Cell phone
Waite
beingBath
fire trantfor
OverBath
1min
2min
3min
4min
5min

fire is come home
fire is over

---------------------



17: error: '(' expected
public void run{
                       ^

class WorkerThread implements Runnable{
    public void run(){
        ....
    }
}

run是方法, 記得加上()


11: error: incompatible types: String cannot be converted to long
Thread.sleep("1000");




13: error: package system does not exist
system.out.println("No bath");
                              ^
---------------------------------------------------

class WithDraw implements Runnable{
    private Account account;
    private double withdrawMoney;
   
    public WithDraw(Account account, double withdrawMoney){
            this.account = account;
            this.withdrawMoney = withdrawMoney;
    }
    public void run(){
        account.withDraw(account,withdrawMoney);
    }
}

class Account{
    private double balance;
    public Account(double balance){
        this.balance = balance;
    }
    public void withDraw(Account account, double withdrawMoney){
        String tName = Thread.currentThread().getName();
        System.out.println(tName+" Start ");
       
        double tmpBalance = balance;
        for(double d = 0 ; d < 99999999 ; d++);
       
        tmpBalance = tmpBalance - withdrawMoney;
        if(tmpBalance < 0){
            System.out.println("------------\n"+" No Money "+"\n------------");
        }else{
            balance = tmpBalance;
        }
        System.out.println(tName+"     OutMoney: "+withdrawMoney+"$, Overage "+ account.checkAccount());
    }
    public double checkAccount(){
        return balance;
    }
}

public class MagicMachine{
    public static void main(String args[]){
        Account ac = new Account(10000);
        System.out.println("Original money: "+ ac.checkAccount()+"$" );
        WithDraw s1 = new WithDraw(ac,5000);
        WithDraw s2 = new WithDraw(ac,2000);
        WithDraw s3 = new WithDraw(ac,4000);
        Thread t1 = new Thread(s1,"T1");
        Thread t2 = new Thread(s2,"T2");
        Thread t3 = new Thread(s3,"T3");
        t1.start();
        t2.start();
        t3.start();
    }
}


Original money: 10000.0$
T1 Start
T3 Start
T2 Start
T1     OutMoney: 5000.0$, Overage 5000.0
T2     OutMoney: 2000.0$, Overage 8000.0
T3     OutMoney: 4000.0$, Overage 6000.0

如果說for迴圈數目太小, 就會發生
Original money: 10000.0$
T1 Start
T2 Start
     OutMoney: 5000.0$, Overage 5000.0
T1 Over
------------
     OutMoney: 2000.0$, Overage 3000.0
T2 Over
------------
T3 Start
------------
 No Money
------------
     OutMoney: 4000.0$, Overage 3000.0
T3 Over
------------

速度太快使得有些執行序會跑兩次