增加新代码

src/main/java/com/diguage/truman/concurrent/ConcurrentMapTest.java

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+package com.diguage.truman.concurrent;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class ConcurrentMapTest {
+  @Test
+  public void test() {
+    ConcurrentMap<String, AtomicInteger> map = new ConcurrentHashMap<>();
+//    AtomicInteger cnt = map.putIfAbsent("abc", new AtomicInteger(10));
+    AtomicInteger cnt = map.computeIfAbsent("abc", (k) -> new AtomicInteger(10));
+    System.out.println(cnt);
+  }
+}

src/main/java/com/diguage/truman/concurrent/ScheduledThreadPoolExecutorTest.java

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+package com.diguage.truman.concurrent;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDateTime;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.LockSupport;
+
+public class ScheduledThreadPoolExecutorTest {
+  @Test
+  public void test() {
+    ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(0);
+    executor.scheduleAtFixedRate(() -> System.out.println("OKKK"), 0, 10, TimeUnit.MINUTES);
+    LockSupport.parkNanos(TimeUnit.MINUTES.toNanos(1));
+    System.out.println(executor);
+  }
+
+  @Test
+  public void testSchedule() {
+    ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(0);
+    for (int i = 0; i < 100; i++) {
+      executor.schedule(() -> System.out.println(LocalDateTime.now() + " OKKK"), 0, TimeUnit.MINUTES);
+    }
+    LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(10));
+    System.out.println(executor);
+  }
+}

src/main/java/com/diguage/truman/io/FileTest.java

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+package com.diguage.truman.io;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.Date;
+
+import static java.nio.file.StandardOpenOption.TRUNCATE_EXISTING;
+
+public class FileTest {
+
+  private static DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");
+
+  @Test
+  public void test() {
+    File file = new File("/Users/lijun695/vm.log");
+    long mod = file.lastModified();
+    System.out.println(new Date(mod).toInstant().atZone(ZoneId.systemDefault()));
+    System.out.println(file.getName());
+  }
+
+  public static void main(String[] args) throws IOException {
+    for (int i = 0; i < 10; i++) {
+      Files.write(Paths.get("/tmp/abc123/456/20230609183256983"),
+        ("" + i + " -- D瓜哥 · https://www.diguage.com").getBytes(StandardCharsets.UTF_8), TRUNCATE_EXISTING);
+    }
+  }
+
+  public static void createDirectory(String path) {
+    File file = new File(path);
+    if (file.exists() && !file.isDirectory()) {
+      file.delete();
+    }
+    if (!file.exists()) {
+      try {
+        Files.createDirectories(Paths.get(path));
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+}

src/main/java/com/diguage/truman/math/BigDecimalTest.java

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+package com.diguage.truman.math;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+
+public class BigDecimalTest {
+  @Test
+  public void test() {
+    BigDecimal decimal = new BigDecimal("10.");
+    System.out.println(decimal);
+  }
+}

src/main/java/com/diguage/truman/time/FormatTest.java

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+package com.diguage.truman.time;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class FormatTest {
+
+  @Test
+  public void test() {
+    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");
+//    ZonedDateTime time = ZonedDateTime.parse("20230815114735092", formatter);
+    LocalDateTime t3 = LocalDateTime.parse("20230609143033001", formatter);
+    LocalDateTime t1 = LocalDateTime.parse("20230815114735092", formatter);
+    LocalDateTime t2 = LocalDateTime.parse("20230815114735099", formatter);
+    System.out.println();
+  }
+}

src/main/java/com/diguage/truman/time/ZoneTest.java

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+package com.diguage.truman.time;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+
+public class ZoneTest {
+  @Test
+  public void test() {
+    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Asia/Shanghai"));
+    ZonedDateTime tomorrow = now.plusDays(1L).truncatedTo(ChronoUnit.DAYS).plusHours(5L);
+    System.out.println(now);
+    System.out.println(tomorrow);
+  }
+}