[Java] 자료형 변환

Dealing with nulls UtilFactory.convertNull Java – comparing strings Use == for primitive data types like int If (mystring == null) Use the equals() method to compare objects Use .equals for strings : if (a.equals(“cat”)) Java - Converting int to string String myString = Integer.toString(my int value) or String str = "" + i Java - Converting String to int int i = Integer.parseInt(str); or int i = Integer.valueOf(str).intValue(); double to String : String str = Double.toString(i); long to String : String str = Long.toString(l); float to String : String str = Float.toString(f); String to double : double d = Double.valueOf(str).doubleValue(); String to long : long l = Long.valueOf(str).longValue(); or long l = Long.parseLong(str); String to float : float f = Float.valueOf(str).floatValue(); decimal to binary : int i = 42; String binstr = Integer.toBinaryString(i); decimal to hexadecimal : int i = 42; String hexstr = Integer.toString(i, 16); or String hexstr = Integer.toHexString(i); or (with leading zeroes and uppercase) public class Hex { public static void main(String args[]){ int i = 42; System.out.print (Integer.toHexString( 0x10000 | i).substring(1).toUpperCase()); } } hexadecimal (String) to integer : int i = Integer.valueOf("B8DA3", 16).intValue(); or int i = Integer.parseInt("B8DA3", 16); ASCII code to String int i = 64; String aChar = new Character((char)i).toString(); integer to ASCII code (byte) char c = 'A'; int i = (int) c; // i will have the value 65 decimal integer to boolean b = (i != 0); boolean to integer i = (b)?1:0;

[출처 및 본문] http://blog.bagesoft.com/1002
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