[問題] java多執行緒問題請教
我想自行練習寫一個多執行緒，
讓args吃兩個參數-一個決定動態生成幾個Thread-一個是整數N
把整數N平分給每個Thread去計算總和最後再把所有Thread算好的部分加總起來
但我的程式遇到一點問題，
我希望呼叫check方法時可以取得所有thread算完的總和，請問該怎麼做呢?????
public class Project {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
String temp1="";
String temp2="";
int ThreadNum=0;
int n=0;
temp1 = args[0];
temp2 = args[1];
ThreadNum = Integer.parseInt(temp1);
n = Integer.parseInt(temp2);
Show ba = new Show();
Counting[] p = new Counting[ThreadNum+1];
Thread[] t = new Thread[p.length];
int total =0;
for(int i=1;i<p.length;i++)
{
int m = (i-1)*(n/ThreadNum)+1;
int s = i*(n/ThreadNum);
String Name = "t["+i+"]";
p[i] = new Counting(ba,Name,m,s);
t[i] = new Thread(p[i]);
t[i].start();
System.out.println(ba.total);
}
//System.out.println();
//System.out.println("temp="+temp);
}
}
class Show
{
public static int total ;
public static int last =total;
public void save(int x)
{
total+=x;
//System.out.println("now total:"+total);
}
public void check()
{
System.out.println(total);
//return total;
}
}
class Counting implements Runnable
{
private int start;
private int end;
public int sum;
private String name;
Show ba;
public int temp=0;
Counting (Show ba,String n,int m,int s)
{
this.ba = ba;
name = n;
start = m;
end = s;
}
public synchronized void run()
{
System.out.println(name+"\tstarting");
for(int a = start;a<=end;a++)
{
sum+=a;
}
//System.out.println(t[0].current.getName());
//System.out.println(start+"\t"+end+"\t"+sum);
//System.out.println("-----------------");
ba.save(sum);
temp = sum;
//System.out.println(ba.check());
ba.check();
System.out.println(name+"\tover");
}
}
--
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