关于scanner.nextInt()等next()和scanner.nextIine()连用注意事项

public static void main(String[] args) {
	Scanner scanner = new Scanner(System.in);
	while(scanner.hasNext()) {
		int x = scanner.nextInt();
		int y = scanner.nextInt();
		if (x==0&&y==0) {
			scanner.close();
			break;
		}
		//scanner.nextLine();
		String a = "";
		for (int i = 0; i < x; i++) {
			a +=scanner.nextLine();
		}
		for (int i = 0; i < a.length(); i++) {
			if (i%y == 0) {
				System.out.println();
			}
			System.out.print(a.charAt(i));
			
		}
		
		}
}

/*用户输入：
 
  4空格4\n  	//遇到空格结束 x=4, 第二nextInt()遇到换行了结束它的扫描 y=4;
  			但是此行还没有结束，nextLine会继续扫描剩余部分直到换行，光标才会进入下一行
  			只不过剩余的是空字符串，记第一次nextLine()为a1,a1=""
  ****\n  	//a2 = "****",a2记第二次nextLine()
  ....\n  	//a3= "...."
  ....\n	//a4= "...."	
  ****\n	//此刻此行没有对应的nextline()，也就无法输入了，接下就执行打印输出了。
  
  */

int x = scanner.nextInt();
		int y = scanner.nextInt();
		if (x==0&&y==0) {
			scanner.close();
			break;
		}
		scanner.nextLine();//用于缓冲换行符，换入新的一行。
		String a = "";
		for (int i = 0; i < x; i++) {
			a +=scanner.nextLine();
		}

Scanner scan = new Scanner(System.in);
        System.out.print("请输入:");
        String year = scan.next();
        System.out.printf("%s",year);

Scanner scan = new Scanner(System.in);
System.out.print("请输入:");
String year = scan.nextln();
System.out.printf("%s",year);

//useDelimiter("\n"); //“\n”换行符（回车）作为输入的分隔符
Scanner scan = new Scanner(System.in).useDelimiter("\n");
System.out.print("请输入:");
String year = scan.next();
System.out.printf("%s",year);