Explanation
1. When SimpleDateFormat is defined as a local variable, each thread occupies the SimpleDateFormat target exclusively.
2. It is equivalent to changing a multi-thread program into a single-thread program, so there is no thread insecurity problem.
Example
import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class SimpleDateFormatExample { public static void main(String[] args) { // 创建线程池 ExecutorService threadPool = Executors.newFixedThreadPool(10); // 执行 10 次时间格式化 for (int i = 0; i < 10; i++) { int finalI = i; // 线程池执行任务 threadPool.execute(new Runnable() { @Override public void run() { // 创建 SimpleDateFormat 对象 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss"); // 创建时间对象 Date date = new Date(finalI * 1000); // 执行时间格式化并打印结果 System.out.println(simpleDateFormat.format(date)); } }); } // 任务执行完之后关闭线程池 threadPool.shutdown(); } }
The above is the detailed content of How to convert local variables in java SimpleDateFormat. For more information, please follow other related articles on the PHP Chinese website!