x<<=y是啥个意思啊?

class temp{
public static void main(String args[]){
int x=4,y=3;
System.out.println(x<<=y);
}
}

输出结果是264..为嘛啊?这个 <<= 是啥意思啊?

正确吗：x^y <=> (x|y)&(~x|~y) y-x=1 10x+y> 10x+y<42 已知x<=y<z.|x+y|+|y+z|+|z+x|=4,|x-y|=|y-z|=|z-x|=2 y=x^2(1-x) (0<x<1) 求x的最值~ 已知x,y满足2<=x+y<=4.....则2x-y的取值范围...... f={x,y|0<x*x+y*y<1},点0是f的边界点吗 设集合A={-3<x<3},已知x，y属于N，x>y,x^3+19y=y^3+19x,则{x+y,x-y,xy,x/y}∩A= C语言 X^Y<<2 如何产生这样一组随机数？x*x+y*y+z*z=1 -0.5<=x<=0.5 -0.5<=y<=0.5 函数y=x(1-x^2)(0<x<1)的最大值是