Java 十进制转二、八、十六进制的字符串

class DecToBin{ public static void main(String[] args)  { //System.out.println("Hello World!"); long dec = -9223372036854775807l; // -9223372036854775808 这个数不行，不要试，嘿嘿 String binStr=""; long decAbs=Math.abs(dec); while (decAbs>0) { binStr=(decAbs&1)+binStr; decAbs>>=1; } binStr= dec<0?"-"+binStr:dec==0?"0":binStr; System.out.println(binStr); }}

class DecToOct{ public static void main(String[] args)  { //System.out.println("Hello World!"); long dec=-0;//有-0 吗？ String octStr=""; long decAbs=Math.abs(dec); while (decAbs>0) { octStr=(decAbs&7)+octStr;// decAbs>>=3; } octStr= dec<0?"-"+octStr:dec==0?"0":octStr; System.out.println(octStr); }}

class DecToHex{ public static void main(String[] args)  { System.out.println("Hello World!"); long dec=-1;//计算器的负数不会弄 -。- String hexStr=""; long decAbs=Math.abs(dec); while(decAbs>0) { long lastFour=decAbs&15; if (lastFour>9) hexStr=(char)('A'+lastFour-10)+hexStr; else hexStr=lastFour+hexStr; decAbs>>=4; } hexStr= dec<0?"-"+hexStr:dec==0?"0":hexStr; System.out.println(hexStr); }}