class For { public For(){} public For(int num){ for (int i=1;i<=num ;i++ ) { for (int j=1;j<=i ;j++ ) { System.out.print(i+"*"+j+"="+i*j+"\t"); } System.out.println(); } } } class ForTest { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入一个数"); int num = sc.nextInt(); For f = new For(num); } }
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