java 移位问题

public class a_8 {

public static void main(String[] args) {

	// TODO Auto-generated method stub
	
	//尖括号指到哪边，就往哪边移  >>>高位补0  >>高位补符号位
	
	int a=-10;
	
  System.out.println(a<<2);
  
  System.out.println(a>>2);  
  
}

}