算法练习——(5)输出图形

public class text01{
  public static void main(String[] args) {
    System.out.println("输出实心矩形");
    int s=8;
    String a[][] = new String[s][s];
    for(int i=0;i<s;i++) {
      for (int j=0;j<s;j++)
      {
        a[i][j] =" *";
        System.out.print(a[i][j]);
      }
    System.out.println();
  }
    System.out.print("\n"+"\n"+"\n"+"输出空心矩形"+"\n");
      String b[][] = new String [s][s];
    for(int i=0;i<s;i++) {
      for (int j=0;j<s;j++) {
        if (i>0&&i<s-1&&j>0&&j<s-1) {
          b[i][j] =("  ");          
        }
        else
        {
        b[i][j] =(" *");
        }
        System.out.print(b[i][j]);
      }
      System.out.println();
    } 
    System.out.print("\n"+"\n"+"\n"+"输出正三角形");
    int c [][]=new int [7][13]; 
    for (int i=0;i<7;i++)
    {
      c[i][6]=i+1;
      int n = i+1;
      int p=6;
      int q=6;
      while(n>1&&p<0){
        c[i][--p] = i+1;
      }
      n=i+1;
      while(n>1&&p>0){
        c[i][--p] = --n;
      }
      n=i+1;
      while(n>1&&q<12){
        c[i][++q] = --n;
      }
    }
    for(int i=0;i<7;i++)
    {
      System.out.println();
      for(int j=0;j<13;j++)
      {
        if (c[i][j]==0){
          System.out.print("  ");
        }
        else{
          System.out.print(c[i][j] +" ");
        }
      }
    }
    System.out.println();
    System.out.print("\n"+"\n"+"\n"+"输出菱形");
    for(int i=0;i<7;i++)
        {
            System.out.println();
            for(int j=0;j<13;j++)
            {
                if(c[i][j]==0)
        {
                    System.out.print("  ");
                }else 
        {
                    System.out.print(c[i][j]+ " ");
                }
            }
        }
        for(int i=6;i>=0;i--)
        {
            System.out.println();
            for(int j=0;j<13;j++)
            {
                if(c[i][j]==0){
                    System.out.print("  ");
                }else{
                    System.out.print(c[i][j]+" ");
                }
            }
        }
    }
  }