日常學習2017..18

    昨天主要講了嵌套循環，另外還有break爲中斷，打斷 結束當前循環。continue繼續，結束本次循環並且繼續循環

嵌套循環三要素:外打行，內打列，找規律。其中比較經典的程序有打印一個正方形，下面是程序。

public static void main(String[] args) {
		for (int i = 1; i <= 5; i++) {
			for (int j = 1; j <= 10; j++) {
				System.out.print("*");
			}
			System.out.println();
		}

另外還有打印平行四邊形

for(int i=1;i<=3;i++){
		  for (int k = 1; k<=3-i; k++) {
			System.out.print(" ");
		}
		  for (int j = 1; j<=5; j++) {
				System.out.print("*");
			}
			System.out.println("");

打印等腰三角形

for (int i = 1; i <= 3; i++) {
			for (int k = 1; k <= 3 - i; k++) {
				System.out.print(" ");
			}
			for (int j = 1; j <= 2 * i - 1; j++) {
				System.out.print("*");
			}
			System.out.println();
和打印菱形

for (int i = 1; i <= 3; i++) {
			for (int k = 1; k <= 3 - i; k++) {
				System.out.print(" ");
			}
			for (int j = 1; j <= 2 * i - 1; j++) {
				System.out.print("*");
			}
			System.out.println();
		}
		for (int i = 2; i >= 1; i--) {
			for (int k = 1; k <= 3 - i; k++) {
				System.out.print(" ");
			}
			for (int j = 1; j <= 2 * i - 1; j++) {
				System.out.print("*");
			}
			System.out.println();
		}