Java 형변환 정리

int to string
String myString = Integer.toString(my int value);
String str = "" + i;


String to int
int i = Integer.parseInt(str);
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();
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);
String hexstr = Integer.toHexString(i);
--(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();
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;

퍼왔습니다. 유용하게 쓰겠습니다.

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