各种菱形（java）

	*
	* *
	*   *
	*     *  

import java.util.Scanner;

class QueLing {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int line = sc.nextInt();
		int i,j;
        System.out.println("*");
		for(i = 2; i <= line; i++) {
            System.out.print("*");
			for(j = 1; j <= i-2; j++) {
			    System.out.print(" ");
			}
			System.out.println("*");
		}
	}
}

        *    			
	   * *			
	  *   *			
	 *     *	

import java.util.Scanner;

class QueBian {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int line = sc.nextInt();
		int i,j;
		for(i = line-1; i >= 0; i--) {
			for(j = 1; j <= i; j++) {
			   System.out.print(" ");
			}
            System.out.print("*");
			if(i == line-1) {
			   System.out.println(); 
			   continue;
			}
			for(j = 1; j <= line*2-2*i-3; j++) {
			   System.out.print(" ");
			}
			System.out.println("*");
		}
	}
}

//    *
//   * *
//  *   *
// *     *
//  *   *
//   * *
//    *

import java.util.Scanner;

class KongLing {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int line = sc.nextInt();
		int i,j;
		for(i = line-1; i >= 0; i--) {
			for(j = 1; j <= i; j++) {
			   System.out.print(" ");
			}
            System.out.print("*");
			if(i == line-1) {
			   System.out.println(); 
			   continue;
			}
			for(j = 1; j <= line*2-2*i-3; j++) {
			   System.out.print(" ");
			}
			System.out.println("*");
		}
        for(i = 1; i <= line-1; i++) {
			for(j = 1; j <= i; j++) {
			   System.out.print(" ");
			}	
		    System.out.print("*");
			if(i == line-1) {
			   System.out.println(); 
			   continue;
			}
			for(j = 1; j <= line*2-2*i-3; j++) {
			   System.out.print(" ");
			}
			System.out.println("*");
		}
	}
}

   *       
  ***      
 *****    
*******	
 ***** 	 
  *** 		
   *       
提示：
	先输出上半部分【先输出空格  再输出*】	
	再输出下半部分	

import java.util.Scanner;

class LingXing1 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int line = sc.nextInt();
		int i,j;
        for(i = line-1; i >= 0; i--) {
		   for(j = 1; j <= i; j++) {
		       System.out.print(" ");
		   }
           for(j = 1; j <= 2*line-2*i-1; j++) {
		       System.out.print("*");
		   }
		   System.out.println();
		}
        for(i = 1; i <= line-1; i++) {
		   for(j = 1; j <= i; j++) {
			   System.out.print(" ");
		   }
		   for(j = 1; j <= line*2-i*2-1; j++) {
		       System.out.print("*");  
		   }
           System.out.println();
		}
	}
}