Java 多线程均匀处理同一个List中的数据
需求:使用多线程来处理同一个List中的数据,希望每个线程处理的数量是均匀的
事例代码如下:
public class Test {
static class HandleThread extends Thread {
private String threadName;
private List<String> list;
private int startIndex;
private int endIndex;
public HandleThread(String threadName, List<String> list, int startIndex, int endIndex) {
this.threadName = threadName;
this.list = list;
this.startIndex = startIndex;
this.endIndex = endIndex;
}
public void run() {
List<String> subList = list.subList(startIndex, endIndex);
System.out.println(threadName+"处理了"+subList.size()+"条!startIndex:"+startIndex+"|endIndex:"+endIndex);
}
}
public static void main(String[] args) {
Test test = new Test();
List<String> tmpList = new ArrayList<String>();
for (int i = 0; i < 120; i++) {
tmpList.add("test" + i);
}
int length = tmpList.size();
int num = 10; //初始线程数
//启动多线程
if(num > length){
num = length;
}
int baseNum = length / num;
int remainderNum = length % num;
int end = 0;
for (int i = 0; i < num; i++) {
int start = end ;
end = start + baseNum;
if(i == (num-1)){
end = length;
}else if( i < remainderNum){
end = end + 1;
}
HandleThread thread = new HandleThread("线程[" + (i + 1) + "] ", tmpList,start , end);
thread.start();
}
}
}
控制台输出如下: