java的与或异或运算的好处，补码计算

public class Test {
    
    


    public static void main(String[] args) {
    
    

        int[] repeatInt = {
    
    1, 2, 4, 1, 4};
        int tmp = 0;
        for(int one:repeatInt){
    
    
            tmp ^= one;
        }
        System.out.println("异或运算，抵消相同数字，找到不重复数字：" + tmp);

        int [] seq = {
    
    2,3,1,2,0,3};
        tmp = 0;
        for(int one:seq){
    
    
            tmp <<= 2;
            tmp |= one;
        }
        System.out.println("或运算，把数字填充到对应bit位上，每两个bit存一个数字：" + Integer.toBinaryString(tmp));

        tmp = 341;
        int f = 255;
        int tmp2 = tmp & f;
        System.out.println("与运算，高位清零, f的bit位以外的tmp的bit位置为0, 原：" + Integer.toBinaryString(tmp) + " 清零高位后：" + Integer.toBinaryString(tmp2));

        short s = -3;
        System.out.println("short 实际的内存bit位: " + String.format("%16s",
                Integer.toBinaryString(0xFFFF & s)).replaceAll(" ", "0"));
        System.out.println("short java的Integer.toBinaryString会添加多余位: " + String.format("%16s",
                Integer.toBinaryString( s)).replaceAll(" ", "0"));

        byte b = -2;
        System.out.println("byte 实际的内存bit位: " + String.format("%8s",
                Integer.toBinaryString(0xFF & b)).replaceAll(" ", "0"));
        System.out.println("byte java的Integer.toBinaryString会添加多余位: " + String.format("%8s",
                Integer.toBinaryString( b)).replaceAll(" ", "0"));

        System.out.println("负数补码，电路实际计算过程，负号后面的数字的二进制，减一取反（-128没有反码，就不能取反加一，）：");

    }

}