진법 변환

목적

진법 변환하는 거에 있어서 헷갈리지 않기 위함.
확실하게 암기하자.

int i = 127;
 
String binaryString = Integer.toBinaryString(i); //2진수
String octalString = Integer.toOctalString(i);   //8진수
String hexString = Integer.toHexString(i);       //16진수
 
System.out.println(binaryString); //1111111
System.out.println(octalString);  //177
System.out.println(hexString);    //7f
 
 
int binaryToDecimal = Integer.parseInt(binaryString, 2);
int binaryToOctal = Integer.parseInt(octalString, 8);
int binaryToHex = Integer.parseInt(hexString, 16);
 
System.out.println(binaryToDecimal); //127
System.out.println(binaryToOctal);   //127
System.out.println(binaryToHex);     //127