对Java中基本整数数据类型的各种操作及表示方式

矫情吗；* 2023-10-17 18:16 32阅读 0赞

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);