打印Diamond钻石图案

import java.util.Scanner; // Scanner这个工具类，java利用Scanner获取键盘输入
public class PrintDiamond {
static void printchars(int num, String s) {
for (int i = 1; i<=num; i++)
System.out.print(s);
}

public static void main(String[] args) {
System.out.println("请输入一个奇数：");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();  // n为奇数
int line;
int midLine = n/2+1;
//上半部分
for (line=1; line<= midLine;line++) {
int space = midLine - line;
int star = 2*line - 1;
//输出
printchars(space," ");
printchars(star,"*");
//输出回车换行
System.out.println("");
}
//下半部分
for (line = midLine+1;line<=n;line++) {
int space = line - midLine;
int star = 2*(n-line) + 1;  //输出
printchars(space," ");
printchars(star,"*");
//输出回车换行
System.out.println("");
}
sc.close();
}
}