public?class?HelloWorld{
????public?static?void?main(String[]?args)?{
		int?age1=24;
		int?age2=18;
		int?age3=36;
		int?age4=27;
		int?sum=age1+age2+age3+age4;
		double?avg=sum/4;
		int?minus=age1-age2;
		int?newAge=--age1;
	????System.out.println("年齡總和："+sum);
????	System.out.println("平均年齡："+avg);
		System.out.println("年齡差值："+minus);
		System.out.println("自減后的年齡："+newAge);

	}
}

為什么我代碼全對還是一直讓我檢查代碼再試試啊！