Joonghee's Laboratory

private static void tc16() { System.out.println(Thread.currentThread().getName()); } public static void main(String[] args) { tc16(); } => main

import java.io.*; import java.util.*; import java.util.jar.*; import java.util.zip.*; public class CreateJarFile2 { private static Manifest getManifestFile(JarFile jarFile) throws IOException { JarEntry je = jarFile.getJarEntry("META-INF/MANIFEST.MF"); if (je != null) { Enumeration entries = jarFile.entries(); while (entries.hasMoreElements()) { je = (JarEntry) entries.nextElement(); if ("META-..

public class FindDirectories { public static void main(String[] args) { try { File pathName = new File("c:\\"); String[] fileNames = pathName.list(); for (int i = 0; i < fileNames.length; i++) { File tf = new File(pathName.getPath(), fileNames[i]); if(tf.isFile()) { System.out.println("File: " + tf.getCanonicalPath()); } else if (tf.isDirectory()) { System.out.println("Dir: " + tf.getCanonic..

private static String getWithComma(Integer a_num) { String l_str = null; int l_cnt = 0; int l_size = 0; char l_ch; String l_ret = new String(); int l_rest = 0; l_str = Integer.toString(a_num); l_size = l_str.length(); l_rest = l_size % 3; for(; l_cnt<l_size; l_cnt++) { l_ch = l_str.charAt(l_cnt); if(l_cnt==0 || !((l_cnt%3)==l_rest)) { l_ret += Character.toString(l_ch); continue; } else { // ..

static long l_test6_start; static long l_test6_end; static void test6() { int l_cnt = 0; l_test6_start = System.currentTimeMillis(); for(; l_cnt<1000; l_cnt++) { System.out.println(Test.class.getName()); } l_test6_end = System.currentTimeMillis(); } static long l_test7_start; static long l_test7_end; static void test7() { int l_cnt = 0; String l_str = Test.class.getName(); l_test7_start = Sy..

IBM RSAEE(Rational Software Analyzer Enterprise Edition)라는 도구는 JAVA 코드를 입력받아 Static analysis를 수행한다. 아래는 대상 샘플 코드이다. static void test4() { int l_cnt = 0; System.out.println(System.currentTimeMillis()); for (; l_cnt < 3000; l_cnt++) { try { Thread.sleep(1); } catch (Exception e) { e.printStackTrace(); } } System.out.println(System.current..

IBM RSAEE(Rational Software Analyzer Enterprise Edition)라는 도구는 JAVA 코드를 입력받아 Static analysis를 수행한다. 아래는 대상 샘플 코드이다. static void test1() { int l_cnt = 0; System.out.println(System.currentTimeMillis()); String l_str = new String(new StringBuffer(10000)); for (; l_cnt < 3000; l_cnt++) { l_str += "긍" + "정" + "적" + "으" + "로" + "생..

java에는 call by reference가 없다는 얘기가 있다. http://blog.naver.com/lbiryu?Redirect=Log&logNo=30041427576 http://blog.naver.com/eunjoo000?Redirect=Log&logNo=120045903424 하지만 object를 함수의 매개인자로 전달할때 call by reference인 듯 하다. class subClass { public int a = 0; } private static int tc4() { subClass l_obj = new subClass(); System.out.println("subC..

http://kin.naver.com/detail/detail.php?d1id=1&dir_id=10106&eid=TternPV1QHILVikKq7nKeDB9vLu68ZPh&qb=WG14MjU2bQ==&enc=utf8&pid=fAhRGwoi5TGsst3GckKsss--045102&sid=SiYU46ARJkoAAHZQJLQ ........... java -Xms512m -Xmx1024m SomeMainClass   -Xms 옵션은 JVM의 초기 힙사이즈입니다. 그리고 -Xmx 옵션은 JVM의 최대 힙사이즈입니다. 님께서 옵션은 맞게 찾으셨는데, 단..

http://java.sun.com/docs/books/jls/second_edition/html/interfaces.doc.html9.4.3 Examples of Abstract Method DeclarationsThe following examples illustrate some (possibly subtle) points about abstract method declarations.9.4.3.1 Example: OverridingMethods declared in interfaces are abstract and thus contain no implementation. About all that can be accomplished by an overriding method declaration,..