import?java.util.Scanner;

public?class?HelloWorld?{
	??public?static?void?main(String[]?args)?{?
		??Scanner?input=new?Scanner(System.in);
		??System.out.println("請輸入需要打印菱形的行數(shù)：");
		??int?num=input.nextInt();
		??if((num%2)==0){
			?System.out.println("請輸入奇數(shù)行數(shù)！");?
		??}
		??else{
			??int?half=num/2;
			??int?overhalf=half+1;
			??for(int?a=1;a<=overhalf;a++){
				??for(int?b=1;b<=(overhalf-a);b++){
					??System.out.print("?");
				??}
				??for(int?c=1;c<=a;c++){
					??System.out.print("*");
					??System.out.print("?");
				??}
				??System.out.println();
			??}
			??for(int?m=half;m>=1;m--){
				??for(int?n=(overhalf-m);n>=1;n--){
					??System.out.print("?");
				??}
				??for(int?p=1;p<=m;p++){
					??System.out.print("*");
					??System.out.print("?");
				??}
				??System.out.println();
			??}			??			??
		??}
		??}		??
	??}
	????????
	

public static void main(String[] args){

Scanner in = new Scanner(System.in);

System.out.print("請輸入一個數(shù)字： ");

int number = in.nextInt();

if (number%2=0){

System.out.println("<>");

}else{

System.out.println("輸入錯誤，請重新輸入：");

}

}

先采納我，我就花點功夫幫你寫出來