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--- java/HelloWorld.java ---
package test;
public class HelloWorld {
public static void main(String[] args) {
new HelloWorld().hello();
}
void hello() {
System.out.println("Hello world!");
}
}
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+--- HelloWorld.java
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+--- test
+--- HelloWorld.class
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--- java/Trace.java ---
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.After;
@Aspect public class Trace {
@Pointcut("call(void test.HelloWorld.hello())") void atHello() {}
@Before("atHello()") public void beforeHello() {
System.out.println("Before hello.");
}
@After("atHello()") public void afterHello() {
System.out.println("After hello.");
}
}
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[java] at org.apache.derby.iapi.error.StandardException.newException(Un
known Source)
[java] at org.apache.derby.impl.jdbc.TransactionResourceImpl.shutdownDa
tabaseException(Unknown Source)
[java] at org.apache.derby.impl.jdbc.EmbedConnection.
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public class Test {
static final ThreadLocal DATE_001 = new ThreadLocal() {
protected synchronized Object initialValue() {
return new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
}
};
static final FastDateFormat DATE_002 = FastDateFormat.getInstance("dd-MM-yyyy HH:mm:ss");
public static void main(String[] args) {
Date d = new Date();
long start = System.currentTimeMillis();
for (int i = 0; i < 10000; i++) {
DateFormat df = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
df.format(d);
}
System.out.println("Elapsed:" + (System.currentTimeMillis() - start) + "ms.");
start = System.currentTimeMillis();
for (int i = 0; i < 10000; i++) {
DateFormat df = (DateFormat)DATE_001.get();
df.format(d);
}
System.out.println("Elapsed:" + (System.currentTimeMillis() - start) + "ms.");
start = System.currentTimeMillis();
for (int i = 0; i < 10000; i++) {
DATE_002.format(d);
}
System.out.println("Elapsed:" + (System.currentTimeMillis() - start) + "ms.");
}
}
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