목록분류 전체보기 (1762)

develog

[java] 배열내 중복 체크

private void findDuplicateValue(String[] list) { for (int i = 0; i " + i + ". " + str1); break; } } } }
Dev/Java 2013. 7. 2. 16:14
generate file name

private String generate() { int len = 6; int rnum = (int) Math.floor(Math.random() * Math.pow(10, len)); StringBuffer sb = new StringBuffer(String.valueOf(rnum)); while (sb.toString().length() < len) { sb.append("0"); } return System.currentTimeMillis() + "_" + sb.toString();}
Dev/Java 2013. 7. 2. 16:05
SYS_CONTEXT, USERENV

--클라이언트 IP, HOST, 프로그램명 정보SELECT SYS_CONTEXT('USERENV', 'IP_ADDRESS') , SYS_CONTEXT('USERENV', 'HOST') , SYS_CONTEXT('USERENV','MODULE')FROM DUAL
DB/Oracle 2013. 7. 2. 14:57
String 비교

String str1 = "ABC";String str2 = new String("ABC");String str3 = "ABC"; System.out.println("str1 : " + str1);System.out.println("str2 : " + str2);System.out.println("str3 : " + str3);System.out.println(); System.out.println("str1.toString() : " + str1.toString());System.out.println("str2.toString() : " + str2.toString());System.out.println("str3.toString() : " + str3.toString());System.out.prin..
Dev/Java 2013. 7. 2. 13:28
Object.toString(), System.identityHashCode()

Object obj = new Object();System.out.println("1. " + obj.toString()); System.out.print("2. ");System.out.print(obj.getClass().getName());System.out.print("@");System.out.print(Long.toHexString(System.identityHashCode(obj)));System.out.println(); // console1. java.lang.Object@1c78e572. java.lang.Object@1c78e57
Dev/Java 2013. 7. 2. 13:19
진수 변환

Long num = 29855319L;System.out.println("10진수: " + num);System.out.println(" 2진수: " + Long.toBinaryString(num));System.out.println(" 8진수: " + Long.toOctalString(num));System.out.println("16진수: " + Long.toHexString(num)); // console10진수: 29855319 2진수: 1110001111000111001010111 8진수: 16170712716진수: 1c78e57
Dev/Java 2013. 7. 2. 13:17
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