java 移位問題

public class a_8 {

public static void main(String[] args) {

	// TODO Auto-generated method stub
	
	//尖括號指到哪邊，就往哪邊移  >>>高位補0  >>高位補符號位
	
	int a=-10;
	
  System.out.println(a<<2);
  
  System.out.println(a>>2);  
  
}

}