请问注释中应该怎么解释？谢谢
public class luoJiYunSuan {
public static void main(String[]args){
boolean a,x,y,z;
boolean a1 = 5>6;//为什么a1换成a会显示错误？根据教材应该是a
boolean x1 = !a1;
boolean y1 = a1&&x1;
boolean z1 = x1||y1;
System.out.println("a= "+a1);//教材上面的是a不是a1
System.out.println("x= "+x1);
System.out.println("y= "+y1);
System.out.println("z= "+z1);
}
}
