对Java中基本整数数据类型的各种操作及表示方式

RT，在此，简单描述下Java中整数数据的表示方法
一：二进制、八进制、十六进制、UTF-8字符的表示方法
 

//Binary 0b开头
int i = 0b110100010010101010;
System.out.println("二进制数 0b1101:" + i);

//Octets 0开头
int i01 = 016;
System.out.println("八进制数 016:" + i01);

//Hexdecimal 0x开头
int i02 = 0x124F;
System.out.println("十六进制数 0x124F:" + i02);

//utf-8
char c = '\u2122';
System.out.println("char:" + c);

//十六进制的负数表示 -128
byte b = -0x80;
System.out.println(b);

//127
b = 0x7F;
System.out.println(b);

二：移位操作int i = ((12 & (1 << 3)) >>> 3);
System.out.println(i);
i = ((224 & (1 << 5)) >>> 5);
System.out.println(i);
i = ((224 & (1 << 4)) >>> 4);
System.out.println(i);三：对整数进行位运算int i = 0B10010010;
System.out.println("二进制数 0b10010010:" + i);

//024在二进制中值为0B00010100
int i01 = 024;
System.out.println("八进制数 024:" + i01);

//与运算结果为0b10000
int i02 = i & i01;
System.out.println("0b10010010 & 024:" + i02);

//或运算结果为0b10010110
int i03 = i | i01;
System.out.println("0b10010010 | 024:" + i03);

//非运算结果为0b10000110
int i04 = i ^ i01;
System.out.println("0b10010010 ^ 024:" + i04);四：获取二进制数第i位的值int i = 0B1101; //二进制表示为0B1101

//0B1101 & 0001
int i00 = (i & 1) / 1;

//0B1101 & 0010
int i01 = (i & 2) / 2;

//0B1101 & 0100
int i02 = (i & 4) / 4;

//0B101 & 1000
int i03 = (i & 8) / 8;

System.out.println("0位值：" + i00);
System.out.println("1位值：" + i01);
System.out.println("2位值：" + i02);
System.out.println("3位值：" + i03);