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?ave?=?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);

????}
}