Java 图形 作业

======左边正三角形======
 * 
 *  * 
 *  *  * 
 *  *  *  * 
 *  *  *  *  * 
======左边倒三角形======
 *  *  *  *  * 
 *  *  *  * 
 *  *  * 
 *  * 
 * 
======打印右正三角形======
             * 
          *  * 
       *  *  * 
    *  *  *  * 
 *  *  *  *  * 
======打印右倒三角形======
 *  *  *  *  * 
    *  *  *  * 
       *  *  * 
          *  * 
             * 
======打印正中三角形======
             *       5 6 7  8 9     4 3 2 1 0 
          *  *  * 
       *  *  *  *  * 
    *  *  *  *  *  *  * 
 *  *  *  *  *  *  *  *  * 
======打印倒中三角形======
 *  *  *  *  *  *  *  *  * 
    *  *  *  *  *  *  * 
       *  *  *  *  *   		 G6
          *  *  * 
             * 
======打印正人字状======
             * 												
          *     * 
       *           * 
    *                 * 
 *                       * 
======打印中正空三角形======
             * 
          *     * 
       *           * 
    *                 * 
 *  *  *  *  *  *  *  *  * 
======打印中倒空三角形======
 *  *  *  *  *  *  *  *  * 
    *                 * 
       *           * 
          *     * 
             * 


打印出如下图案（菱形）   
    *   
   ***   
  *****   
 *******   
  *****   
   ***   
    *   

package com.draw;

public class DrawTest {

	public static void main(String[] args) {
//		 G1 ();
//		 G2 ();
//		G3();
//		G4();
		G5();
	//	G6();
		//G7();
	//	G8();
		//G9();
		G10();
	}

	/**
	 * 
	 * * * * * * * * * * *
	 */
	public static void G1() {
		for (int i = 1; i < 6; i++) {
			for (int j = 0; j < i; j++) {

				System.out.print("* ");
			}
			System.out.println();
		}

	}

	public static void G2() {
		for (int i = 6; i > 0; i--) {
			for (int j = 0; j < i; j++) {

				System.out.print("* ");
			}
			System.out.println();
		}

	}

	public static void G3() {
		for (int i = 5; i >0; i--) {
			for (int j = 1
					; j < 6; j++) {
				if (i > j) {
					System.out.print(" ");
				} else {
					System.out.print("*");
				}
			}
			System.out.println();
		}
	}

	public static void G4() {
		for (int i = 1; i < 6; i++) {
			for (int j = 1; j < 6; j++) {
				if (i > j) {
					System.out.print(" ");
				} else {
					System.out.print("*");
				}
			}
			System.out.println();
		}
	}
	
	/**
	 *  每行 5 6 7 8 9 
	 *  每行空格 4 3 2 1
	 */
	public static void G5() {
		
		for (int i = 1; i < 6; i++) {
			for (int j = 1; j < (5+i); j++) {
				// 5-i  1+2*i 
				if (j<(6-i)) {
					System.out.print(" ");
				} else {
					System.out.print("*");
				}
					
				}
			System.out.println();
			}
		}
	
	/**
	 *  i= 9 8 7 6 5
	 *  j= 8 7 6 5 4
	 *  i=9  j<0
	 *  i=8  j<1
	 */
	public static void G6() {
		
		for (int i = 9; i > 4; i--) {
			for (int j = 0; j < i; j++) {
				//j 01234..i   (9-i)
				if (j<(9-i)) {
					System.out.print(" ");
				} else {
					System.out.print("*");
				}
			}
			System.out.println();
		}
	}
	
	/**
	 * i = 0 1 2 3 4
	 * 	04    4
	 * 13 15  6 
	 * 22 26  8
	 * 31 37  10
	 * 40 48  12
	 */
	public static void G7() {
		for (int i = 0; i < 5; i++) {
			for (int j = 0; j < 9; j++) {
				if ((i+j)==4) {
					System.out.print("*");
				} else if ((i+j)==(i*2+4)) {
					System.out.print("*");
				}else {
					System.out.print(" ");
				}
				
			}
			System.out.println();
		}
	}
	
	public static void G8() {
		for (int i = 0; i < 5; i++) {
			for (int j = 0; j < 9; j++) {
				if (i==4) {
					System.out.print("*");
				} else {

					if ((i+j)==4) {
						System.out.print("*");
					} else if ((i+j)==(i*2+4)) {
						System.out.print("*");
					}else {
						System.out.print(" ");
					}
				}
				
			}
			System.out.println();
		}
	}
	/**
	 * i = 0 1 2 3 4
	 * 	04    4
	 * 13 15  6 
	 * 22 26  8
	 * 31 37  10
	 * 40 48  12
	 */
	public static void G9() {
		for (int i = 4; i > -1; i--) {
			for (int j = 0; j < 9; j++) {
				if (i==4) {
					System.out.print("*");
				} else {

					if ((i+j)==4) {
						System.out.print("*");
					} else if ((i+j)==(i*2+4)) {
						System.out.print("*");
					}else {
						System.out.print(" ");
					}
				}
				
			}
			System.out.println();
		}
	}
	public static void G10() {
		
	}
}