编写4个线程，第一个线程从1加到25，第二个线程从26加到50,第三个线程从51加到75，第四个线程从76加到100，最后再把四个线程计算的结果相加。
输入格式:
无
输出格式:
最终结果
输入样例:
输出样例:
5050
import java.util.Scanner;
class CountThread implements Runnable{
private int n;
private int summ=0;
private boolean f=false;
public CountThread() {
}
public CountThread(int n) {
this.n = n;
}
@Override
public void run() {
// TODO Auto-generated method stub
int t=25;
while (t>0) {
summ+=n;
this.n++;
t--;
}
this.f=true;
}
public int getN() {
return n;
}
public void setN(int n) {
this.n = n;
}
public boolean isF() {
return f;
}
public void setF(boolean f) {
this.f = f;
}
public int getSumm() {
return summ;
}
public void setSumm(int summ) {
this.summ = summ;
}
}
public class Main {
public static void main(String[] args) {
CountThread []countThread = new CountThread[4];
for (int i=1;i<100;i+=25) {
int index = (int) Math.floor(i/25);
countThread[index]=new CountThread(i);
}
for(int i=0;i<4;i++) {
new Thread(countThread[i]).start();
}
while(!countThread[0].isF()||!countThread[1].isF()||!countThread[2].isF()||!countThread[3].isF()) {}
System.out.println(countThread[0].getSumm()+countThread[1].getSumm()+countThread[2].getSumm()+countThread[3].getSumm());
}
}
另外一种更高明的方法：（用了thread.join()方法）
import java.util.Scanner;
class CountThread implements Runnable{
private int n;
private int summ=0;
private boolean f=false;
public CountThread() {
}
public CountThread(int n) {
this.n = n;
}
@Override
public void run() {
// TODO Auto-generated method stub
int t=25;
while (t>0) {
summ+=n;
this.n++;
t--;
}
this.f=true;
}
public int getN() {
return n;
}
public void setN(int n) {
this.n = n;
}
public boolean isF() {
return f;
}
public void setF(boolean f) {
this.f = f;
}
public int getSumm() {
return summ;
}
public void setSumm(int summ) {
this.summ = summ;
}
}
public class Main {
public static void main(String[] args) {
CountThread []countThread = new CountThread[4];
Thread [] threads = new Thread[4];
for (int i=1;i<100;i+=25) {
int index = (int) Math.floor(i/25);
countThread[index]=new CountThread(i);
}
for(int i=0;i<4;i++) {
threads[i] = new Thread(countThread[i]);
threads[i].start();
}
for(int i=0;i<4;i++) {
try {
threads[i].join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
int summ=0;
for(int i=0;i<4;i++) {
summ+=countThread[i].getSumm();
}
System.out.println(summ);
}
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