Java 用for循环打出菱形,空菱形,求解!

补充：给点注释号码? 2楼那个if条件实在是太复杂,,(我理解来看...),能不能用三个for写?或者换种方法,,

 3楼的貌似更简单,,但是也请注释一下 ,,, thx

 加了十分

答案：
import java.util.Scanner;
public class Rhombus {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);//可键盘输入图形大小
System.out.print("请输入菱形大小:");
int length = sc.nextInt();//以下是输出空心菱形
for(int i=0;i<2*length-1;i++){
for(int j=0;j<2*length-1;j++){
if(j==length-1-i||-j==length-1-i||i==j-(length-1)||2*length-2-i==j-(length-1))
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();

}//下面是输出实心菱形
System.out.println("----------------");
for(int i=0;i<2*length-1;i++){
for(int j=0;j<2*length-1;j++){
if(j>=length-1-i&&-j<=length-1-i&&i>=j-(length-1)&&2*length-2-i>=j-(length-1))
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();

}
}

}
public class Test {
public static void main(String[] args) {
 for (int i = 1; i <= 5; i++) {
    for (int j = 5 - i; j > 0; j--)
     System.out.print(' ');
    for (int m = 1; m <= 2 * i - 1; m++)
    {
    if(m==1||m==2*i-1)
    System.out.print('*');
    else
    System.out.print(' ');
    }
    System.out.print('\n');
   }
   for (int n = 4; n >= 1; n--) {
    for (int t = 5 - n; t > 0; t--)
     System.out.print(' ');
    for (int k = 1; k <= 2 * n - 1; k++)
    {
    if(k==1||k==2*n-1)
    System.out.print('*');
    else
    System.out.print(' ');
    }
    System.out.print('\n');
   }

}

}
......上面都有了.......最好是看得懂思路吧
//这是实心的----------------长度就是那个hang-------键盘输入你应该会吧
int hang = 9;
int i, j, k = 1;
int hang1 = hang / 2 + 1;
for (i = 1; i != 0; i += k) {
if (i > hang / 2) {
k = -1;
}
for (j = 1; j <= (hang1 + i - 1); j++) {
if (j < (hang1 - i + 1)) {
  System.out.print(" ");
} else {   
  System.out.print("*");
}
}
System.out.println("");
}
//这是空心的
  int hang = 9;
int i, j, k = 1;
int hang1 = hang / 2 + 1;
for (i = 1; i != 0; i += k) {
  if (i > hang / 2) {
    k = -1;
  }
  for (j = 1; j <= (hang1 + i - 1); j++) {
  //System.out.print(j);
    if (j < (hang1 - i + 1)) {
      System.out.print(" ");
    } else {
    if(j==hang1 - i + 1||j==hang1 + i - 1){
    System.out.print("*");
    continue;
    }
    else
    System.out.print(" ");
    }
  }
  System.out.println("");
}

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