public class Main { public static void main(String[] args) { long startTime = System.nanoTime(); long startTime2 = System.currentTimeMillis(); for (int i = -1; ++i < 1000; ) { String row = "Column 1: " + "1" + ", Column 2: " + "2" + ", Column 3: " + "3" + ", Column 3: " + "4"; System.out.println(row); } long endTime = System.nanoTime(); long endTime2 = System.currentTimeMillis(); long durationInMillis = (endTime - startTime) / 1_000_000; long durationInMillis2 = (endTime2 - startTime2) / 1; System.out.println("Time taken to output the result: " + durationInMillis + " milliseconds"); System.out.println("Time taken to output the result: " + durationInMillis2 + " milliseconds"); } } idea 点击运行 Time taken to output the result: 6 milliseconds Time taken to output the result: 6 milliseconds cmd 命令提示符 java Main.java Time taken to output the result: 143 milliseconds Time taken to output the result: 145 milliseconds