输出空心菱形

public class Star01 {public static void main(String[] args) { int i=0,j=0;   for(i=1;i<=5;i++){   for(j=1;j<=5-i;j++){   System.out.print(" ");    }   System.out.print("*");  for(j=1;j<=2*i-3;j++){  System.out.print(" ");  }if(i!=1){ System.out.print("*"); } System.out.println("");    }   for(i=1;i<=4;i++){   for(j=2;j<=1+i;j++){   System.out.print(" ");    }   System.out.print("*");    for(j=3;j>=2*i-3;j--){   System.out.print(" ");    }  if(i!=4){   System.out.print("*");    }   System.out.println();   }   }}