java基础学习

使用java快速打印菱形,主要思路,将菱形的四条边当做函数,来寻找代码之间的关系,从而快速打印.

package day01;

import java.util.Scanner;

import javax.print.DocFlavor.INPUT_STREAM;

public class DoemTest04 {
	
	public static void main(String[] args) {
		//定义一个数组用于存放字符串
		boolean bol=true;
		int m,n;
		String str = "是";
		while(bol){
		System.out.println("请输入需要打印的菱形的行数,只能是奇数");
		Scanner scanner = new Scanner(System.in);
		m=scanner.nextInt();
		String[][] lingxing = new String[m][m];
		n=m/2;
		//将字符串赋值
		for (int i = 0; i <lingxing.length; i++) {
			for (int j = 0; j < lingxing.length; j++) {
				//判断菱形的左上角的字符是否是"*"
					if ((i+j)==n) {
						
						lingxing[i][j]="*";
						
					}else if((j-i)==-n){//判断菱形的左下角的字符是否是"*"
						
						lingxing[i][j]="*";
						
					}else if ((j-i)==n) {//判断菱形的右上角的字符是否是"*"
						
						lingxing[i][j]="*";
						
					}else if ((i+j)==3*n) {//判断菱形的右下角的字符是否是"*"
						
						lingxing[i][j]="*";
						
					}else{
						lingxing[i][j]=" ";
					}
					
					System.out.print(lingxing[i][j]);
					if (j==lingxing.length-1) {
						System.out.println("--------");
					}
			}
		}
		
		//循环输出数组
		System.out.println("是否继续? 是或者否");
		String stry=scanner.next();
		if (stry.equals(str)) {
			System.out.println("继续");
		}else{
			bol = false;
			System.out.println("退出");
		}
		
		}	
	}
}